diff --git a/backend/src/TeleWave.Application/Common/Models/Result.cs b/backend/src/TeleWave.Application/Common/Models/Result.cs
index 17a96dc..d6c6a13 100644
--- a/backend/src/TeleWave.Application/Common/Models/Result.cs
+++ b/backend/src/TeleWave.Application/Common/Models/Result.cs
@@ -18,10 +18,10 @@ public class Result
 
     public static Result Success() => new(true, Error.None);
 
-    public static Result Failure(Error error) => new(false, error);
-
     public static Result<T> Success<T>(T value) => new(value, true, Error.None);
 
+    public static Result Failure(Error error) => new(false, error);
+
     public static Result<T> Failure<T>(Error error) => new(default, false, error);
 }
 
diff --git a/backend/src/TeleWave.Application/Programming/Planning/GroupExpander.cs b/backend/src/TeleWave.Application/Programming/Planning/GroupExpander.cs
index ff3d8da..da34fbc 100644
--- a/backend/src/TeleWave.Application/Programming/Planning/GroupExpander.cs
+++ b/backend/src/TeleWave.Application/Programming/Planning/GroupExpander.cs
@@ -195,7 +195,7 @@ public sealed class GroupExpander(IAppDbContext dbContext)
                 e.ChannelId == channelId
                 && e.Kind == ScheduleEntryKind.Program
                 && e.ShowId != null
-                && showIds.Contains(e.ShowId!.Value)
+                && showIds.Contains(e.ShowId.Value)
             )
             .GroupBy(e => e.ShowId!.Value)
             .Select(g => new { ShowId = g.Key, LastPlayed = g.Max(e => e.StartsAtUtc) })
@@ -221,7 +221,7 @@ public sealed class GroupExpander(IAppDbContext dbContext)
                 e.ChannelId == channelId
                 && e.Kind == ScheduleEntryKind.Program
                 && e.ShowId != null
-                && showIds.Contains(e.ShowId!.Value)
+                && showIds.Contains(e.ShowId.Value)
                 && e.StartsAtUtc >= since
             )
             .Select(e => new { ShowId = e.ShowId!.Value, e.StartsAtUtc })
diff --git a/backend/src/TeleWave.Application/Programming/Templates/PlanningRules.cs b/backend/src/TeleWave.Application/Programming/Templates/PlanningRules.cs
index e01f104..75aec3b 100644
--- a/backend/src/TeleWave.Application/Programming/Templates/PlanningRules.cs
+++ b/backend/src/TeleWave.Application/Programming/Templates/PlanningRules.cs
@@ -50,12 +50,8 @@ public sealed record PlanningRules(
 
         // Пересекающиеся окна разрешаются в пользу строгого: детское время не должно
         // отменяться более широким окном, случайно наложенным сверху.
-        ShowAudience? strictest = null;
-        foreach (var window in windows.Where(w => w.Contains(moment)))
-            strictest = strictest is { } current && current <= window.MaxAudience
-                ? current
-                : window.MaxAudience;
-        return strictest;
+        var applicable = windows.Where(w => w.Contains(moment)).Select(w => w.MaxAudience).ToList();
+        return applicable.Count > 0 ? applicable.Min() : null;
     }
 
     public string ToJson() => JsonSerializer.Serialize(this, Options);
diff --git a/backend/src/TeleWave.Infrastructure/Identity/RoleService.cs b/backend/src/TeleWave.Infrastructure/Identity/RoleService.cs
index 3e3ff01..85f3ee4 100644
--- a/backend/src/TeleWave.Infrastructure/Identity/RoleService.cs
+++ b/backend/src/TeleWave.Infrastructure/Identity/RoleService.cs
@@ -110,7 +110,7 @@ internal sealed class RoleService(
         if (currentRoles.Count > 0)
             await userManager.RemoveFromRolesAsync(user, currentRoles);
 
-        await userManager.AddToRoleAsync(user, role.Name!);
+        await userManager.AddToRoleAsync(user, role.Name);
 
         return Result.Success();
     }
diff --git a/frontend/src/features/admin/channels/ChannelDetail.tsx b/frontend/src/features/admin/channels/ChannelDetail.tsx
index f894fca..39789d9 100644
--- a/frontend/src/features/admin/channels/ChannelDetail.tsx
+++ b/frontend/src/features/admin/channels/ChannelDetail.tsx
@@ -31,7 +31,7 @@ import { ViewerCard } from './components/ViewerCard'
 const TABS = ['settings', 'grid', 'rules', 'junctions', 'bumpers', 'viewer', 'air'] as const
 type ChannelTab = (typeof TABS)[number]
 
-export function ChannelDetail({ channelId }: { channelId: string }) {
+export function ChannelDetail({ channelId }: Readonly<{ channelId: string }>) {
   const { t } = useTranslation()
   const queryClient = useQueryClient()
   const [applyOpen, setApplyOpen] = useState(false)
@@ -52,7 +52,7 @@ export function ChannelDetail({ channelId }: { channelId: string }) {
   })
   const { data: schedule } = useQuery({
     queryKey: qk.channels.schedule(channelId),
-    queryFn: () => getSchedule(channelId, new Date(), new Date(Date.now() + 12 * 3600_000)),
+    queryFn: () => getSchedule(channelId, new Date(), new Date(Date.now() + 12 * 3_600_000)),
   })
 
   const invalidate = () => {
diff --git a/frontend/src/features/admin/channels/components/ApplyDialog.tsx b/frontend/src/features/admin/channels/components/ApplyDialog.tsx
index 576bf1e..5851f98 100644
--- a/frontend/src/features/admin/channels/components/ApplyDialog.tsx
+++ b/frontend/src/features/admin/channels/components/ApplyDialog.tsx
@@ -25,13 +25,13 @@ export function ApplyDialog({
   pending,
   onApply,
   onClose,
-}: {
+}: Readonly<{
   channelId: string
   utcOffsetMinutes: number
   pending: boolean
   onApply: () => void
   onClose: () => void
-}) {
+}>) {
   const { t } = useTranslation()
   const { data, isFetching } = useQuery({
     queryKey: qk.channels.diff(channelId),
diff --git a/frontend/src/features/admin/channels/components/BumperBackgroundField.tsx b/frontend/src/features/admin/channels/components/BumperBackgroundField.tsx
index 1381db7..a343d77 100644
--- a/frontend/src/features/admin/channels/components/BumperBackgroundField.tsx
+++ b/frontend/src/features/admin/channels/components/BumperBackgroundField.tsx
@@ -13,13 +13,13 @@ export function BumperBackgroundField({
   backgroundImageId,
   onChanged,
   onError,
-}: {
+}: Readonly<{
   channelId: string
   templateId: string
   backgroundImageId: string | null
   onChanged: () => void
   onError: (e: unknown) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const [galleryOpen, setGalleryOpen] = useState(false)
 
diff --git a/frontend/src/features/admin/channels/components/BumperCard.tsx b/frontend/src/features/admin/channels/components/BumperCard.tsx
index d8aacc1..4b1066a 100644
--- a/frontend/src/features/admin/channels/components/BumperCard.tsx
+++ b/frontend/src/features/admin/channels/components/BumperCard.tsx
@@ -15,12 +15,12 @@ export function BumperCard({
   bare,
   onSaved,
   onError,
-}: {
+}: Readonly<{
   channel: ChannelDto
   bare?: boolean
   onSaved: () => void
   onError: (e: unknown) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const [bumpersEnabled, setBumpersEnabled] = useState(channel.bumpersEnabled)
   const [bumper, setBumper] = useState<BumperSettings>(channel.bumper)
diff --git a/frontend/src/features/admin/channels/components/BumperFileUpload.tsx b/frontend/src/features/admin/channels/components/BumperFileUpload.tsx
index 0485987..c1e833c 100644
--- a/frontend/src/features/admin/channels/components/BumperFileUpload.tsx
+++ b/frontend/src/features/admin/channels/components/BumperFileUpload.tsx
@@ -15,7 +15,7 @@ export function BumperFileUpload({
   clear,
   onSaved,
   onError,
-}: {
+}: Readonly<{
   channelId: string
   templateId: string
   kind: string
@@ -27,7 +27,7 @@ export function BumperFileUpload({
   clear: (id: string, templateId: string) => Promise<void>
   onSaved: () => void
   onError: (e: unknown) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const inputId = `bumper-${kind}-${templateId}`
 
diff --git a/frontend/src/features/admin/channels/components/BumperPreviewPlayer.tsx b/frontend/src/features/admin/channels/components/BumperPreviewPlayer.tsx
index ce18032..a78e72a 100644
--- a/frontend/src/features/admin/channels/components/BumperPreviewPlayer.tsx
+++ b/frontend/src/features/admin/channels/components/BumperPreviewPlayer.tsx
@@ -11,12 +11,12 @@ export function BumperPreviewPlayer({
   templateId,
   variants,
   onError,
-}: {
+}: Readonly<{
   channelId: string
   templateId: string
   variants: BumperTextVariantDto[]
   onError: (e: unknown) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const [ready, setReady] = useState(false)
   const [bust, setBust] = useState(0)
diff --git a/frontend/src/features/admin/channels/components/BumperTemplateEditor.tsx b/frontend/src/features/admin/channels/components/BumperTemplateEditor.tsx
index cbe1d96..ab08b52 100644
--- a/frontend/src/features/admin/channels/components/BumperTemplateEditor.tsx
+++ b/frontend/src/features/admin/channels/components/BumperTemplateEditor.tsx
@@ -26,12 +26,12 @@ export function BumperTemplateEditor({
   template,
   onChanged,
   onError,
-}: {
+}: Readonly<{
   channelId: string
   template: BumperTemplateDto
   onChanged: () => void
   onError: (e: unknown) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const [open, setOpen] = useState(false)
   const [name, setName] = useState(template.name)
diff --git a/frontend/src/features/admin/channels/components/BumperVariantEditor.tsx b/frontend/src/features/admin/channels/components/BumperVariantEditor.tsx
index 9fca9ba..322da6d 100644
--- a/frontend/src/features/admin/channels/components/BumperVariantEditor.tsx
+++ b/frontend/src/features/admin/channels/components/BumperVariantEditor.tsx
@@ -16,14 +16,14 @@ export function BumperVariantEditor({
   canRemove,
   onChanged,
   onError,
-}: {
+}: Readonly<{
   channelId: string
   templateId: string
   variant: BumperTextVariantDto
   canRemove: boolean
   onChanged: () => void
   onError: (e: unknown) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const [form, setForm] = useState({
     name: variant.name,
diff --git a/frontend/src/features/admin/channels/components/CollapsibleCard.tsx b/frontend/src/features/admin/channels/components/CollapsibleCard.tsx
index 62971c4..3d83e98 100644
--- a/frontend/src/features/admin/channels/components/CollapsibleCard.tsx
+++ b/frontend/src/features/admin/channels/components/CollapsibleCard.tsx
@@ -9,14 +9,14 @@ export function CollapsibleCard({
   bare = false,
   contentClassName,
   children,
-}: {
+}: Readonly<{
   title: string
   defaultOpen?: boolean
   /** Без своего заголовка и сворачивания — когда карточка и так лежит во вкладке с этим названием. */
   bare?: boolean
   contentClassName?: string
   children: ReactNode
-}) {
+}>) {
   const [open, setOpen] = useState(defaultOpen)
 
   if (bare)
diff --git a/frontend/src/features/admin/channels/components/EntryTraceDialog.tsx b/frontend/src/features/admin/channels/components/EntryTraceDialog.tsx
index 6d9b3e2..831e415 100644
--- a/frontend/src/features/admin/channels/components/EntryTraceDialog.tsx
+++ b/frontend/src/features/admin/channels/components/EntryTraceDialog.tsx
@@ -19,11 +19,11 @@ export function EntryTraceDialog({
   entryId,
   utcOffsetMinutes,
   onClose,
-}: {
+}: Readonly<{
   entryId: string
   utcOffsetMinutes: number
   onClose: () => void
-}) {
+}>) {
   const { t } = useTranslation()
   const { data } = useQuery({
     queryKey: qk.entries.trace(entryId),
@@ -99,7 +99,7 @@ function strategySummary(data: EntryTraceDto, t: Translate) {
   ])
 }
 
-function Row({ label, children }: { label: string; children: React.ReactNode }) {
+function Row({ label, children }: Readonly<{ label: string; children: React.ReactNode }>) {
   return (
     <>
       <dt className="text-muted-foreground">{label}</dt>
diff --git a/frontend/src/features/admin/channels/components/GridTab.tsx b/frontend/src/features/admin/channels/components/GridTab.tsx
index 0d9b378..78af3a7 100644
--- a/frontend/src/features/admin/channels/components/GridTab.tsx
+++ b/frontend/src/features/admin/channels/components/GridTab.tsx
@@ -38,13 +38,13 @@ export function GridTab({
   templateError,
   onChanged,
   onError,
-}: {
+}: Readonly<{
   channelId: string
   template: ScheduleTemplateDto | undefined
   templateError: unknown
   onChanged: () => void
   onError: (error: unknown) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const [draft, setDraft] = useState<SlotDraft | null>(null)
   const [activeLayerId, setActiveLayerId] = useState<string | null>(null)
@@ -141,17 +141,17 @@ export function GridTab({
       slot,
       weekday,
       startMinutes,
-    }: {
+    }: Readonly<{
       slot: SlotDto
       weekday: number
       startMinutes: number
-    }) => updateSlot(slot.id, { ...toSlotBody(slot), weekday, targetStart: toTime(startMinutes) }),
+    }>) => updateSlot(slot.id, { ...toSlotBody(slot), weekday, targetStart: toTime(startMinutes) }),
     onSuccess: onChanged,
     onError,
   })
 
   const resizeSlotMutation = useMutation({
-    mutationFn: ({ slot, minutes }: { slot: SlotDto; minutes: number }) =>
+    mutationFn: ({ slot, minutes }: Readonly<{ slot: SlotDto; minutes: number }>) =>
       updateSlot(slot.id, { ...toSlotBody(slot), targetDurationMinutes: minutes }),
     onSuccess: onChanged,
     onError,
@@ -159,7 +159,7 @@ export function GridTab({
 
   /** Копирование дня: слоты «каждый день» не копируются — они и так есть во всех колонках. */
   const copyDayMutation = useMutation({
-    mutationFn: async ({ from, to }: { from: number; to: number[] }) => {
+    mutationFn: async ({ from, to }: Readonly<{ from: number; to: number[] }>) => {
       const sources = (template?.layers ?? []).flatMap((layer) =>
         layer.slots.filter((slot) => slot.weekday === from).map((slot) => ({ layer, slot })),
       )
diff --git a/frontend/src/features/admin/channels/components/JunctionElementDialog.tsx b/frontend/src/features/admin/channels/components/JunctionElementDialog.tsx
index 9b02097..816de1e 100644
--- a/frontend/src/features/admin/channels/components/JunctionElementDialog.tsx
+++ b/frontend/src/features/admin/channels/components/JunctionElementDialog.tsx
@@ -44,14 +44,14 @@ export function JunctionElementDialog({
   onClose,
   onChanged,
   onError,
-}: {
+}: Readonly<{
   junctionId: string
   element: JunctionElementDto
   bumperTemplates: BumperTemplateDto[]
   onClose: () => void
   onChanged: () => void
   onError: (error: unknown) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const [body, setBody] = useState<JunctionElementBody>(() => toBody(element))
   const { data: groups } = useQuery({ queryKey: qk.groups.all, queryFn: listGroups })
diff --git a/frontend/src/features/admin/channels/components/JunctionsCard.tsx b/frontend/src/features/admin/channels/components/JunctionsCard.tsx
index 5a7c11b..9765832 100644
--- a/frontend/src/features/admin/channels/components/JunctionsCard.tsx
+++ b/frontend/src/features/admin/channels/components/JunctionsCard.tsx
@@ -86,13 +86,13 @@ export function JunctionsCard({
   bare,
   onChanged,
   onError,
-}: {
+}: Readonly<{
   channel: ChannelDto
   template: ScheduleTemplateDto | undefined
   bare?: boolean
   onChanged: () => void
   onError: (error: unknown) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const [newName, setNewName] = useState('')
 
@@ -186,13 +186,13 @@ function JunctionChain({
   groups,
   onChanged,
   onError,
-}: {
+}: Readonly<{
   junction: JunctionTemplateDto
   channel: ChannelDto
   groups: GroupSummaryDto[] | undefined
   onChanged: () => void
   onError: (error: unknown) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const [name, setName] = useState<string | null>(null)
   const [dragged, setDragged] = useState<string | null>(null)
diff --git a/frontend/src/features/admin/channels/components/LayerApplicabilityDialog.tsx b/frontend/src/features/admin/channels/components/LayerApplicabilityDialog.tsx
index c2df1a9..e2a73b2 100644
--- a/frontend/src/features/admin/channels/components/LayerApplicabilityDialog.tsx
+++ b/frontend/src/features/admin/channels/components/LayerApplicabilityDialog.tsx
@@ -29,12 +29,12 @@ export function LayerApplicabilityDialog({
   onClose,
   onChanged,
   onError,
-}: {
+}: Readonly<{
   layer: GridLayerDto
   onClose: () => void
   onChanged: () => void
   onError: (error: unknown) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const [name, setName] = useState(layer.name)
   const [weekdays, setWeekdays] = useState<number[]>(layer.applicability?.weekdays ?? [])
@@ -199,12 +199,12 @@ function Section({
   onAdd,
   empty,
   children,
-}: {
+}: Readonly<{
   title: string
   onAdd: () => void
   empty: boolean
   children: React.ReactNode
-}) {
+}>) {
   const { t } = useTranslation()
   return (
     <div className="flex flex-col gap-2">
@@ -228,11 +228,11 @@ function MonthDay({
   value,
   prefix,
   onChange,
-}: {
+}: Readonly<{
   value: AnnualRange
   prefix: 'from' | 'to'
   onChange: (part: Partial<AnnualRange>) => void
-}) {
+}>) {
   const month = prefix === 'from' ? value.fromMonth : value.toMonth
   const day = prefix === 'from' ? value.fromDay : value.toDay
 
diff --git a/frontend/src/features/admin/channels/components/RulesCard.tsx b/frontend/src/features/admin/channels/components/RulesCard.tsx
index b029781..3d872d1 100644
--- a/frontend/src/features/admin/channels/components/RulesCard.tsx
+++ b/frontend/src/features/admin/channels/components/RulesCard.tsx
@@ -37,12 +37,12 @@ export function RulesCard({
   bare,
   onChanged,
   onError,
-}: {
+}: Readonly<{
   template: ScheduleTemplateDto
   bare?: boolean
   onChanged: () => void
   onError: (error: unknown) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const [windows, setWindows] = useState<WindowRow[]>(() =>
     toRows(template.rules?.maxAudienceByTime ?? []),
diff --git a/frontend/src/features/admin/channels/components/ScheduleGrid.tsx b/frontend/src/features/admin/channels/components/ScheduleGrid.tsx
index eaa81c7..c0e9288 100644
--- a/frontend/src/features/admin/channels/components/ScheduleGrid.tsx
+++ b/frontend/src/features/admin/channels/components/ScheduleGrid.tsx
@@ -56,7 +56,7 @@ export function ScheduleGrid({
   onMoveSlot,
   onResizeSlot,
   onCopyDay,
-}: {
+}: Readonly<{
   template: ScheduleTemplateDto
   selectedSlotId: string | null
   /** Дата, на которую смотрим сетку («показать 25 декабря»); null — все слои разом. */
@@ -67,7 +67,7 @@ export function ScheduleGrid({
   onMoveSlot: (slot: SlotDto, weekday: number, startMinutes: number) => void
   onResizeSlot: (slot: SlotDto, durationMinutes: number) => void
   onCopyDay: (fromWeekday: number) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const dayStart = template.dayStartTime.slice(0, 5)
   const dayStartMinutes = minutesOf(dayStart)
@@ -280,7 +280,7 @@ export function LayerList({
   onToggle,
   onReorder,
   onEditApplicability,
-}: {
+}: Readonly<{
   template: ScheduleTemplateDto
   activeLayerId: string | null
   viewDate: string | null
@@ -289,7 +289,7 @@ export function LayerList({
   onToggle: (layer: GridLayerDto) => void
   onReorder: (layerIdsTopFirst: string[]) => void
   onEditApplicability: (layer: GridLayerDto) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const [dragged, setDragged] = useState<string | null>(null)
 
diff --git a/frontend/src/features/admin/channels/components/SchedulePreview.tsx b/frontend/src/features/admin/channels/components/SchedulePreview.tsx
index df162a1..cd4f496 100644
--- a/frontend/src/features/admin/channels/components/SchedulePreview.tsx
+++ b/frontend/src/features/admin/channels/components/SchedulePreview.tsx
@@ -5,7 +5,7 @@ import { Badge } from '@/shared/ui/badge'
 import { formatTime } from '../lib/format'
 
 /** Что стоит в строке расписания: реклама, заставка-переход или программа с номером серии. */
-function EntryLabel({ entry }: { entry: ScheduleEntryDto }) {
+function EntryLabel({ entry }: Readonly<{ entry: ScheduleEntryDto }>) {
   const { t } = useTranslation()
 
   if (entry.kind === 'Ad') return <Badge variant="muted">{t('air.ad')}</Badge>
@@ -35,7 +35,7 @@ function EntryLabel({ entry }: { entry: ScheduleEntryDto }) {
 }
 
 /** «· S02E05» либо «· серия N» — что удалось распознать; ничего, если ни того ни другого нет. */
-function EpisodeSuffix({ entry }: { entry: ScheduleEntryDto }) {
+function EpisodeSuffix({ entry }: Readonly<{ entry: ScheduleEntryDto }>) {
   const { t } = useTranslation()
 
   if (entry.seasonEpisode)
@@ -54,10 +54,10 @@ function EpisodeSuffix({ entry }: { entry: ScheduleEntryDto }) {
 export function SchedulePreview({
   entries,
   onShowTrace,
-}: {
+}: Readonly<{
   entries: ScheduleEntryDto[]
   onShowTrace: (entryId: string) => void
-}) {
+}>) {
   const { t } = useTranslation()
   if (entries.length === 0)
     return <p className="text-muted-foreground">{t('admin.channels.noSchedule')}</p>
diff --git a/frontend/src/features/admin/channels/components/SettingsCard.tsx b/frontend/src/features/admin/channels/components/SettingsCard.tsx
index 00a6c7b..417b9e5 100644
--- a/frontend/src/features/admin/channels/components/SettingsCard.tsx
+++ b/frontend/src/features/admin/channels/components/SettingsCard.tsx
@@ -16,13 +16,13 @@ export function SettingsCard({
   bare,
   onSaved,
   onError,
-}: {
+}: Readonly<{
   channel: ChannelDto
   readyAssets: { id: string; originalFileName: string }[]
   bare?: boolean
   onSaved: () => void
   onError: (e: unknown) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const [name, setName] = useState(channel.name)
   const [isEnabled, setIsEnabled] = useState(channel.isEnabled)
diff --git a/frontend/src/features/admin/channels/components/SlotInspector.tsx b/frontend/src/features/admin/channels/components/SlotInspector.tsx
index 3baee36..116b45e 100644
--- a/frontend/src/features/admin/channels/components/SlotInspector.tsx
+++ b/frontend/src/features/admin/channels/components/SlotInspector.tsx
@@ -68,12 +68,12 @@ export function SlotInspector({
   draft,
   onClose,
   onChanged,
-}: {
+}: Readonly<{
   channelId: string
   draft: SlotDraft
   onClose: () => void
   onChanged: () => void
-}) {
+}>) {
   const { t } = useTranslation()
   const [body, setBody] = useState<SlotBody>(() =>
     draft.slot ? toSlotBody(draft.slot) : emptyBody(draft.defaults),
diff --git a/frontend/src/features/admin/channels/components/TemplateIssues.tsx b/frontend/src/features/admin/channels/components/TemplateIssues.tsx
index c769f0a..34eb50f 100644
--- a/frontend/src/features/admin/channels/components/TemplateIssues.tsx
+++ b/frontend/src/features/admin/channels/components/TemplateIssues.tsx
@@ -14,11 +14,11 @@ export function TemplateIssues({
   channelId,
   slotsById,
   onGoToSlot,
-}: {
+}: Readonly<{
   channelId: string
   slotsById: Map<string, SlotDto>
   onGoToSlot: (slot: SlotDto) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const { data: issues } = useQuery({
     queryKey: qk.channels.issues(channelId),
@@ -53,11 +53,11 @@ function IssueRow({
   issue,
   slot,
   onGoToSlot,
-}: {
+}: Readonly<{
   issue: TemplateIssueDto
   slot: SlotDto | undefined
   onGoToSlot: (slot: SlotDto) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const Icon = issue.severity === 'Error' ? CircleAlert : AlertTriangle
 
diff --git a/frontend/src/features/admin/channels/components/TemplatePreview.tsx b/frontend/src/features/admin/channels/components/TemplatePreview.tsx
index efdbf68..e854142 100644
--- a/frontend/src/features/admin/channels/components/TemplatePreview.tsx
+++ b/frontend/src/features/admin/channels/components/TemplatePreview.tsx
@@ -27,7 +27,7 @@ const PROGRAMME_KINDS = new Set<PlannedItemKind>(['Program', 'Fallback', 'SignOf
  * Предпросмотр (см. 6.4): прогон генератора по текущим правилам без записи и без продвижения
  * курсоров. Заставки приходят резервом известной длины — реальный рендер только при применении.
  */
-export function TemplatePreview({ channelId }: { channelId: string }) {
+export function TemplatePreview({ channelId }: Readonly<{ channelId: string }>) {
   const { t } = useTranslation()
   const [open, setOpen] = useState(false)
   const [days, setDays] = useState(1)
@@ -97,7 +97,7 @@ export function TemplatePreview({ channelId }: { channelId: string }) {
   )
 }
 
-function Programme({ preview }: { preview: SchedulePreviewDto }) {
+function Programme({ preview }: Readonly<{ preview: SchedulePreviewDto }>) {
   const { t } = useTranslation()
   const items = preview.items.filter((i) => PROGRAMME_KINDS.has(i.kind))
 
@@ -143,7 +143,7 @@ function loadByHour(preview: SchedulePreviewDto): { hour: Date; minutes: number
     .map(([hour, minutes]) => ({ hour: new Date(hour), minutes }))
 }
 
-function Tape({ preview }: { preview: SchedulePreviewDto }) {
+function Tape({ preview }: Readonly<{ preview: SchedulePreviewDto }>) {
   const { t } = useTranslation()
   const load = useMemo(() => loadByHour(preview), [preview])
   const peak = Math.max(1, ...load.map((l) => l.minutes))
@@ -180,7 +180,10 @@ function Tape({ preview }: { preview: SchedulePreviewDto }) {
   )
 }
 
-function TapeRow({ item, preview }: { item: PreviewItemDto; preview: SchedulePreviewDto }) {
+function TapeRow({
+  item,
+  preview,
+}: Readonly<{ item: PreviewItemDto; preview: SchedulePreviewDto }>) {
   const { t } = useTranslation()
   const minutes =
     (new Date(item.endsAtUtc).getTime() - new Date(item.startsAtUtc).getTime()) / 60_000
@@ -200,7 +203,7 @@ function TapeRow({ item, preview }: { item: PreviewItemDto; preview: SchedulePre
 }
 
 /** Предупреждения, сгруппированные по виду: десять однотипных строк читаются как одна проблема. */
-function Problems({ preview }: { preview: SchedulePreviewDto }) {
+function Problems({ preview }: Readonly<{ preview: SchedulePreviewDto }>) {
   const { t } = useTranslation()
   // Ключ строки — «вид + порядковый номер внутри вида»: у предупреждения нет своего id, а текст
   // повторяется (одна и та же причина на разных слотах), и позиция здесь — единственное, что его
@@ -250,7 +253,7 @@ function Problems({ preview }: { preview: SchedulePreviewDto }) {
  * Тепловая карта повторов: матрица «шоу × вещательные сутки», яркость — число показов. Сразу видно,
  * что один фильм крутится четыре раза за неделю.
  */
-function RepeatHeatmap({ preview }: { preview: SchedulePreviewDto }) {
+function RepeatHeatmap({ preview }: Readonly<{ preview: SchedulePreviewDto }>) {
   const { t } = useTranslation()
 
   const { days, rows } = useMemo(() => {
diff --git a/frontend/src/features/admin/channels/components/ViewerCard.tsx b/frontend/src/features/admin/channels/components/ViewerCard.tsx
index 3a3c1c2..bed76ab 100644
--- a/frontend/src/features/admin/channels/components/ViewerCard.tsx
+++ b/frontend/src/features/admin/channels/components/ViewerCard.tsx
@@ -21,12 +21,12 @@ export function ViewerCard({
   bare,
   onSaved,
   onError,
-}: {
+}: Readonly<{
   channel: ChannelDto
   bare?: boolean
   onSaved: () => void
   onError: (error: unknown) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const [viewer, setViewer] = useState<ViewerSettings>(channel.viewer)
   const [galleryOpen, setGalleryOpen] = useState(false)
diff --git a/frontend/src/features/admin/collections/CollectionDetail.tsx b/frontend/src/features/admin/collections/CollectionDetail.tsx
index fef2f71..db41172 100644
--- a/frontend/src/features/admin/collections/CollectionDetail.tsx
+++ b/frontend/src/features/admin/collections/CollectionDetail.tsx
@@ -22,7 +22,7 @@ import {
   updateCollection,
 } from './api'
 
-export function CollectionDetail({ collectionId }: { collectionId: string }) {
+export function CollectionDetail({ collectionId }: Readonly<{ collectionId: string }>) {
   const { t } = useTranslation()
   const queryClient = useQueryClient()
   const [galleryOpen, setGalleryOpen] = useState(false)
diff --git a/frontend/src/features/admin/genres/GenresPanel.tsx b/frontend/src/features/admin/genres/GenresPanel.tsx
index eaa7fb1..34e04f1 100644
--- a/frontend/src/features/admin/genres/GenresPanel.tsx
+++ b/frontend/src/features/admin/genres/GenresPanel.tsx
@@ -73,12 +73,12 @@ export function GenresPanel() {
     mutationFn: ({
       id,
       ...body
-    }: {
+    }: Readonly<{
       id: string
       name: string
       sortOrder: number
       aliases: string[]
-    }) => updateGenre(id, body),
+    }>) => updateGenre(id, body),
     onSuccess: invalidate,
   })
   const deleteMutation = useMutation({
diff --git a/frontend/src/features/admin/groups/DurationLabel.tsx b/frontend/src/features/admin/groups/DurationLabel.tsx
index 8f93b79..1803b9d 100644
--- a/frontend/src/features/admin/groups/DurationLabel.tsx
+++ b/frontend/src/features/admin/groups/DurationLabel.tsx
@@ -2,7 +2,7 @@ import { useTranslation } from 'react-i18next'
 import { splitDuration } from './format'
 
 /** Объём эфира: «118 ч 40 мин». Ноль — прочерк, потому что «0 ч» читается как сбой подсчёта. */
-export function DurationLabel({ seconds }: { seconds: number }) {
+export function DurationLabel({ seconds }: Readonly<{ seconds: number }>) {
   const { t } = useTranslation()
   const parts = splitDuration(seconds)
   if (!parts) return <>—</>
diff --git a/frontend/src/features/admin/groups/GroupDetail.tsx b/frontend/src/features/admin/groups/GroupDetail.tsx
index 12be56a..67abef4 100644
--- a/frontend/src/features/admin/groups/GroupDetail.tsx
+++ b/frontend/src/features/admin/groups/GroupDetail.tsx
@@ -25,7 +25,7 @@ import { GroupFilterPanel } from './GroupFilterPanel'
 
 const EMPTY_FILTER: GroupFilter = {}
 
-export function GroupDetail({ groupId }: { groupId: string }) {
+export function GroupDetail({ groupId }: Readonly<{ groupId: string }>) {
   const { t } = useTranslation()
   const queryClient = useQueryClient()
 
@@ -88,7 +88,7 @@ export function GroupDetail({ groupId }: { groupId: string }) {
     onError,
   })
   const weightMutation = useMutation({
-    mutationFn: ({ itemId, weight }: { itemId: string; weight: number }) =>
+    mutationFn: ({ itemId, weight }: Readonly<{ itemId: string; weight: number }>) =>
       setGroupItemWeight(groupId, itemId, weight),
     onSuccess: invalidate,
     onError,
diff --git a/frontend/src/features/admin/groups/GroupFilterPanel.tsx b/frontend/src/features/admin/groups/GroupFilterPanel.tsx
index 58134ce..dccc6e0 100644
--- a/frontend/src/features/admin/groups/GroupFilterPanel.tsx
+++ b/frontend/src/features/admin/groups/GroupFilterPanel.tsx
@@ -14,10 +14,10 @@ const SHOW_KINDS: ShowKind[] = ['Series', 'Single']
 export function GroupFilterPanel({
   filter,
   onChange,
-}: {
+}: Readonly<{
   filter: GroupFilter
   onChange: (next: GroupFilter) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const { data: genres } = useQuery({ queryKey: qk.genres.all, queryFn: listGenres })
 
diff --git a/frontend/src/features/admin/images/ImageGallery.tsx b/frontend/src/features/admin/images/ImageGallery.tsx
index 715547e..c472714 100644
--- a/frontend/src/features/admin/images/ImageGallery.tsx
+++ b/frontend/src/features/admin/images/ImageGallery.tsx
@@ -25,11 +25,11 @@ export function GalleryBrowser({
   category = 'Library',
   onSelect,
   onClose,
-}: {
+}: Readonly<{
   category?: ImageCategory
   onSelect?: (image: ImagePick) => void
   onClose?: () => void
-}) {
+}>) {
   const { t } = useTranslation()
   const queryClient = useQueryClient()
   const [active, setActive] = useState<ImageCategory>(category)
@@ -193,12 +193,12 @@ export function ImageGallery({
   onOpenChange,
   category,
   onSelect,
-}: {
+}: Readonly<{
   open: boolean
   onOpenChange: (open: boolean) => void
   category?: ImageCategory
   onSelect?: (image: ImagePick) => void
-}) {
+}>) {
   const { t } = useTranslation()
   return (
     <Dialog open={open} onOpenChange={onOpenChange}>
diff --git a/frontend/src/features/admin/interstitials/BlockBuilder.tsx b/frontend/src/features/admin/interstitials/BlockBuilder.tsx
index b956d4d..1f71413 100644
--- a/frontend/src/features/admin/interstitials/BlockBuilder.tsx
+++ b/frontend/src/features/admin/interstitials/BlockBuilder.tsx
@@ -16,10 +16,10 @@ import { formatClock } from './format'
 export function BlockBuilder({
   onSaved,
   onError,
-}: {
+}: Readonly<{
   onSaved: () => void
   onError: (error: unknown) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const [name, setName] = useState('')
   const [items, setItems] = useState<ClipDragItem[]>([])
diff --git a/frontend/src/features/admin/interstitials/ClipGroupPanel.tsx b/frontend/src/features/admin/interstitials/ClipGroupPanel.tsx
index 64efbc4..dd34ff1 100644
--- a/frontend/src/features/admin/interstitials/ClipGroupPanel.tsx
+++ b/frontend/src/features/admin/interstitials/ClipGroupPanel.tsx
@@ -15,7 +15,7 @@ import { formatClock } from './format'
  * Группы роликов собираются здесь же, а не в общем редакторе групп (см. 6.7): в выбранную группу
  * перетаскиваются и отдельные ролики, и готовые блоки — стык умеет и то и другое.
  */
-export function ClipGroupPanel({ onError }: { onError: (error: unknown) => void }) {
+export function ClipGroupPanel({ onError }: Readonly<{ onError: (error: unknown) => void }>) {
   const { t } = useTranslation()
   const queryClient = useQueryClient()
   const [selected, setSelected] = useState('')
diff --git a/frontend/src/features/admin/interstitials/InterstitialsPanel.tsx b/frontend/src/features/admin/interstitials/InterstitialsPanel.tsx
index 5310f13..a52fd1f 100644
--- a/frontend/src/features/admin/interstitials/InterstitialsPanel.tsx
+++ b/frontend/src/features/admin/interstitials/InterstitialsPanel.tsx
@@ -48,7 +48,7 @@ export function InterstitialsPanel() {
   const onError = useApiError()
 
   const renameMutation = useMutation({
-    mutationFn: ({ id, name }: { id: string; name: string }) => renameShow(id, name),
+    mutationFn: ({ id, name }: Readonly<{ id: string; name: string }>) => renameShow(id, name),
     onSuccess: () => {
       setRenaming(null)
       invalidate()
diff --git a/frontend/src/features/admin/media/ManualInboxDialog.tsx b/frontend/src/features/admin/media/ManualInboxDialog.tsx
index b3dbec3..e52a853 100644
--- a/frontend/src/features/admin/media/ManualInboxDialog.tsx
+++ b/frontend/src/features/admin/media/ManualInboxDialog.tsx
@@ -45,7 +45,7 @@ function formatSize(bytes: number): string {
  * Номера сезона и серии распознаются здесь же и в таком виде и уходят на сервер: что показано,
  * то и сохранится.
  */
-export function ManualInboxDialog({ onClose }: { onClose: () => void }) {
+export function ManualInboxDialog({ onClose }: Readonly<{ onClose: () => void }>) {
   const { t } = useTranslation()
   const queryClient = useQueryClient()
   const [selected, setSelected] = useState<string[]>([])
diff --git a/frontend/src/features/admin/media/MediaPanel.tsx b/frontend/src/features/admin/media/MediaPanel.tsx
index 14be1f4..b78b7b7 100644
--- a/frontend/src/features/admin/media/MediaPanel.tsx
+++ b/frontend/src/features/admin/media/MediaPanel.tsx
@@ -261,7 +261,7 @@ export function MediaPanel() {
   )
 }
 
-function MediaRow({ asset, onDelete }: { asset: MediaAssetDto; onDelete: () => void }) {
+function MediaRow({ asset, onDelete }: Readonly<{ asset: MediaAssetDto; onDelete: () => void }>) {
   const { t } = useTranslation()
   return (
     <tr className="border-b border-border last:border-0">
diff --git a/frontend/src/features/admin/media/UploadSnackbar.tsx b/frontend/src/features/admin/media/UploadSnackbar.tsx
index a659654..915fd49 100644
--- a/frontend/src/features/admin/media/UploadSnackbar.tsx
+++ b/frontend/src/features/admin/media/UploadSnackbar.tsx
@@ -3,7 +3,7 @@ import { AlertCircle, Check, ChevronDown, ChevronUp, Clock, Loader2, RotateCw, X
 import { cn } from '@/shared/lib/cn'
 import { type UploadItem, useUploadStore } from './upload-store'
 
-function StatusIcon({ status }: { status: UploadItem['status'] }) {
+function StatusIcon({ status }: Readonly<{ status: UploadItem['status'] }>) {
   switch (status) {
     case 'done':
       return <Check className="h-3.5 w-3.5 shrink-0 text-primary" />
diff --git a/frontend/src/features/admin/media/UploadToShowDialog.tsx b/frontend/src/features/admin/media/UploadToShowDialog.tsx
index d8a2c9c..980e052 100644
--- a/frontend/src/features/admin/media/UploadToShowDialog.tsx
+++ b/frontend/src/features/admin/media/UploadToShowDialog.tsx
@@ -23,7 +23,10 @@ import { useUploadStore } from './upload-store'
 /** Radix Select запрещает пустое значение — под «в библиотеку» используем спец-значение. */
 const LIBRARY_VALUE = '__library__'
 
-export function UploadToShowDialog({ files, onClose }: { files: File[]; onClose: () => void }) {
+export function UploadToShowDialog({
+  files,
+  onClose,
+}: Readonly<{ files: File[]; onClose: () => void }>) {
   const { t } = useTranslation()
   const enqueue = useUploadStore((s) => s.enqueue)
   const [seasonStr, setSeasonStr] = useState('')
diff --git a/frontend/src/features/admin/roles/RolesPanel.tsx b/frontend/src/features/admin/roles/RolesPanel.tsx
index 8629dbd..c80e1bb 100644
--- a/frontend/src/features/admin/roles/RolesPanel.tsx
+++ b/frontend/src/features/admin/roles/RolesPanel.tsx
@@ -50,7 +50,7 @@ export function RolesPanel() {
   })
 
   const renameMutation = useMutation({
-    mutationFn: ({ id, name }: { id: string; name: string }) => updateRole(id, name),
+    mutationFn: ({ id, name }: Readonly<{ id: string; name: string }>) => updateRole(id, name),
     onSuccess: invalidate,
     onError,
   })
diff --git a/frontend/src/features/admin/shows/ShowDetail.tsx b/frontend/src/features/admin/shows/ShowDetail.tsx
index 9c2dea2..4fe5815 100644
--- a/frontend/src/features/admin/shows/ShowDetail.tsx
+++ b/frontend/src/features/admin/shows/ShowDetail.tsx
@@ -44,7 +44,7 @@ function addButtonLabel(
   return `${t('admin.shows.addSelected')} (${count})`
 }
 
-export function ShowDetail({ showId }: { showId: string }) {
+export function ShowDetail({ showId }: Readonly<{ showId: string }>) {
   const { t } = useTranslation()
   const queryClient = useQueryClient()
   const [filter, setFilter] = useState('')
diff --git a/frontend/src/features/admin/shows/ShowGenresField.tsx b/frontend/src/features/admin/shows/ShowGenresField.tsx
index 33ef482..6985ba9 100644
--- a/frontend/src/features/admin/shows/ShowGenresField.tsx
+++ b/frontend/src/features/admin/shows/ShowGenresField.tsx
@@ -15,7 +15,10 @@ import { setShowGenres } from './api'
  * Жанры шоу: бейджи в шапке карточки + диалог правки. Основной жанр отмечается отдельно —
  * он показывается в списке шоу и участвует в отборе контента наравне с остальными.
  */
-export function ShowGenresField({ show, onChanged }: { show: ShowDto; onChanged: () => void }) {
+export function ShowGenresField({
+  show,
+  onChanged,
+}: Readonly<{ show: ShowDto; onChanged: () => void }>) {
   const { t } = useTranslation()
   const [open, setOpen] = useState(false)
   const [selected, setSelected] = useState<string[]>([])
diff --git a/frontend/src/features/admin/shows/ShowMetadataCard.tsx b/frontend/src/features/admin/shows/ShowMetadataCard.tsx
index e5afa4b..afb0e3b 100644
--- a/frontend/src/features/admin/shows/ShowMetadataCard.tsx
+++ b/frontend/src/features/admin/shows/ShowMetadataCard.tsx
@@ -28,7 +28,10 @@ import {
   updateMetadata,
 } from './api'
 
-export function ShowMetadataCard({ show, onChanged }: { show: ShowDto; onChanged: () => void }) {
+export function ShowMetadataCard({
+  show,
+  onChanged,
+}: Readonly<{ show: ShowDto; onChanged: () => void }>) {
   const { t } = useTranslation()
   const [galleryOpen, setGalleryOpen] = useState(false)
   const [provider, setProvider] = useState('')
@@ -359,7 +362,7 @@ export function ShowMetadataCard({ show, onChanged }: { show: ShowDto; onChanged
 }
 
 /** Итог по сезону: чего не хватает — или что полный состав сезона неизвестен. */
-function SeasonGapNote({ gap }: { gap: MissingEpisodesReport['seasons'][number] }) {
+function SeasonGapNote({ gap }: Readonly<{ gap: MissingEpisodesReport['seasons'][number] }>) {
   const { t } = useTranslation()
 
   if (gap.expected == null)
diff --git a/frontend/src/features/admin/users/UsersPanel.tsx b/frontend/src/features/admin/users/UsersPanel.tsx
index c550f22..14fe914 100644
--- a/frontend/src/features/admin/users/UsersPanel.tsx
+++ b/frontend/src/features/admin/users/UsersPanel.tsx
@@ -64,7 +64,7 @@ export function UsersPanel() {
   const unblockMutation = useMutation({ mutationFn: unblockUser, onSuccess: invalidate, onError })
   const deleteMutation = useMutation({ mutationFn: deleteUser, onSuccess: invalidate, onError })
   const changeRoleMutation = useMutation({
-    mutationFn: ({ userId, roleId: nextRoleId }: { userId: string; roleId: string }) =>
+    mutationFn: ({ userId, roleId: nextRoleId }: Readonly<{ userId: string; roleId: string }>) =>
       changeUserRole(userId, nextRoleId),
     onSuccess: invalidate,
     onError,
@@ -302,11 +302,11 @@ function ResetPasswordDialog({
   user,
   onClose,
   onError,
-}: {
+}: Readonly<{
   user: UserSummaryDto
   onClose: () => void
   onError: (e: unknown) => void
-}) {
+}>) {
   const { t } = useTranslation()
   const [password, setPassword] = useState('')
 
diff --git a/frontend/src/features/auth/LoginForm.tsx b/frontend/src/features/auth/LoginForm.tsx
index 5bb53fe..2f88365 100644
--- a/frontend/src/features/auth/LoginForm.tsx
+++ b/frontend/src/features/auth/LoginForm.tsx
@@ -16,7 +16,7 @@ const schema = z.object({
 
 type FormValues = z.infer<typeof schema>
 
-export function LoginForm({ onSuccess }: { onSuccess: () => void }) {
+export function LoginForm({ onSuccess }: Readonly<{ onSuccess: () => void }>) {
   const { t } = useTranslation()
   const {
     register: registerField,
diff --git a/frontend/src/features/auth/RegisterForm.tsx b/frontend/src/features/auth/RegisterForm.tsx
index 817df16..b2c9ceb 100644
--- a/frontend/src/features/auth/RegisterForm.tsx
+++ b/frontend/src/features/auth/RegisterForm.tsx
@@ -16,7 +16,7 @@ const schema = z.object({
 
 type FormValues = z.infer<typeof schema>
 
-export function RegisterForm({ onSuccess }: { onSuccess: () => void }) {
+export function RegisterForm({ onSuccess }: Readonly<{ onSuccess: () => void }>) {
   const { t } = useTranslation()
   const {
     register: registerField,
diff --git a/frontend/src/features/streaming/AirPage.tsx b/frontend/src/features/streaming/AirPage.tsx
index 95a71db..c50b50d 100644
--- a/frontend/src/features/streaming/AirPage.tsx
+++ b/frontend/src/features/streaming/AirPage.tsx
@@ -15,7 +15,7 @@ function formatTime(iso: string) {
 }
 
 /** Кадр серии, если он есть; иначе постер шоу (он вертикальный, отсюда другая ширина). */
-function EntryThumb({ entry }: { entry: PublicEpgEntryDto | undefined }) {
+function EntryThumb({ entry }: Readonly<{ entry: PublicEpgEntryDto | undefined }>) {
   if (entry?.episodeStillImageId)
     return (
       <img
diff --git a/frontend/src/features/streaming/ChannelPlayer.tsx b/frontend/src/features/streaming/ChannelPlayer.tsx
index 3c09e9d..534048b 100644
--- a/frontend/src/features/streaming/ChannelPlayer.tsx
+++ b/frontend/src/features/streaming/ChannelPlayer.tsx
@@ -58,7 +58,7 @@ export function ChannelPlayer({
   nextUp,
   flash,
   onUnavailable,
-}: {
+}: Readonly<{
   slug: string
   /** Канал, чьи оверлеи рисуем. Всё опционально: канал без логотипа и без шума — норма. */
   channel?: PublicChannelDto
@@ -67,7 +67,7 @@ export function ChannelPlayer({
   /** Показать чёрный кадр с номером — переключение по номерам, как на телевизоре. */
   flash?: boolean
   onUnavailable?: () => void
-}) {
+}>) {
   const { t } = useTranslation()
   const containerRef = useRef<HTMLDivElement>(null)
   const videoRef = useRef<HTMLVideoElement>(null)
diff --git a/frontend/src/features/streaming/PlayerOverlays.tsx b/frontend/src/features/streaming/PlayerOverlays.tsx
index 65885fb..2f1442d 100644
--- a/frontend/src/features/streaming/PlayerOverlays.tsx
+++ b/frontend/src/features/streaming/PlayerOverlays.tsx
@@ -19,11 +19,11 @@ export function ChannelLogo({
   imageId,
   corner,
   opacity,
-}: {
+}: Readonly<{
   imageId: string
   corner: LogoCorner
   opacity: number
-}) {
+}>) {
   return (
     <img
       src={imageUrl(imageId)}
@@ -52,7 +52,7 @@ export function ScreenClock() {
 }
 
 /** Плашка «Далее: …» — данные уже есть в EPG, отдельного запроса не нужно. */
-export function NextUpBanner({ title }: { title: string }) {
+export function NextUpBanner({ title }: Readonly<{ title: string }>) {
   const { t } = useTranslation()
   return (
     <span className="pointer-events-none absolute bottom-14 left-3 rounded bg-black/60 px-2 py-1 text-sm text-white">
@@ -65,7 +65,7 @@ export function NextUpBanner({ title }: { title: string }) {
  * Аналоговый фильтр: лёгкий VHS-шум, дрожание и размытие краёв. Переборщить очень легко, поэтому
  * сила регулируется, а вклад каждого слоя от неё убывает нелинейно.
  */
-export function AnalogFilter({ strength }: { strength: number }) {
+export function AnalogFilter({ strength }: Readonly<{ strength: number }>) {
   const s = Math.min(1, Math.max(0, strength))
   return (
     <>
@@ -91,7 +91,7 @@ export function AnalogFilter({ strength }: { strength: number }) {
 }
 
 /** Короткий чёрный кадр с номером канала — как при переключении на телевизоре. */
-export function ChannelFlash({ number, name }: { number: number | null; name: string }) {
+export function ChannelFlash({ number, name }: Readonly<{ number: number | null; name: string }>) {
   return (
     <div className="pointer-events-none absolute inset-0 flex items-start justify-end bg-black">
       <span className="m-6 flex items-baseline gap-2 text-white">
diff --git a/frontend/src/shared/ui/ToastProvider.tsx b/frontend/src/shared/ui/ToastProvider.tsx
index cefdbf9..8bdb4e2 100644
--- a/frontend/src/shared/ui/ToastProvider.tsx
+++ b/frontend/src/shared/ui/ToastProvider.tsx
@@ -8,7 +8,7 @@ import {
 
 let nextId = 1
 
-export function ToastProvider({ children }: { children: ReactNode }) {
+export function ToastProvider({ children }: Readonly<{ children: ReactNode }>) {
   const [toasts, setToasts] = useState<ToastItem[]>([])
 
   const push = useCallback((message: string, variant: ToastVariant) => {
diff --git a/frontend/src/shared/ui/badge.tsx b/frontend/src/shared/ui/badge.tsx
index 14d0f8e..0b953c2 100644
--- a/frontend/src/shared/ui/badge.tsx
+++ b/frontend/src/shared/ui/badge.tsx
@@ -18,6 +18,6 @@ const badgeVariants = cva(
 
 export type BadgeProps = HTMLAttributes<HTMLSpanElement> & VariantProps<typeof badgeVariants>
 
-export function Badge({ className, variant, ...props }: BadgeProps) {
+export function Badge({ className, variant, ...props }: Readonly<BadgeProps>) {
   return <span className={cn(badgeVariants({ variant }), className)} {...props} />
 }
diff --git a/frontend/src/shared/ui/hls-video.tsx b/frontend/src/shared/ui/hls-video.tsx
index 8e77cfd..48e596d 100644
--- a/frontend/src/shared/ui/hls-video.tsx
+++ b/frontend/src/shared/ui/hls-video.tsx
@@ -7,7 +7,7 @@ import { cn } from '@/shared/lib/cn'
  * Мини-плеер HLS для админки: плейлист и сегменты лежат под admin-роутами (JWT), поэтому запросы
  * идут через hls.js с Bearer-заголовком. Нативный путь (Safari) — только там, где hls.js не нужен.
  */
-export function HlsVideo({ src, className }: { src: string; className?: string }) {
+export function HlsVideo({ src, className }: Readonly<{ src: string; className?: string }>) {
   const videoRef = useRef<HTMLVideoElement>(null)
 
   useEffect(() => {
diff --git a/frontend/src/shared/ui/pager.tsx b/frontend/src/shared/ui/pager.tsx
index 871ba7d..ac48f3b 100644
--- a/frontend/src/shared/ui/pager.tsx
+++ b/frontend/src/shared/ui/pager.tsx
@@ -6,11 +6,11 @@ export function Pager({
   page,
   totalPages,
   onChange,
-}: {
+}: Readonly<{
   page: number
   totalPages: number
   onChange: (page: number) => void
-}) {
+}>) {
   const { t } = useTranslation()
   if (totalPages <= 1) return null
 
diff --git a/frontend/src/shared/ui/sortable.tsx b/frontend/src/shared/ui/sortable.tsx
index 52ef439..aa13c99 100644
--- a/frontend/src/shared/ui/sortable.tsx
+++ b/frontend/src/shared/ui/sortable.tsx
@@ -9,13 +9,13 @@ export function SortHeader({
   sort,
   onToggle,
   className,
-}: {
+}: Readonly<{
   label: string
   sortKey: string
   sort: SortState
   onToggle: (key: string) => void
   className?: string
-}) {
+}>) {
   const active = sort.key === sortKey
   const direction = sort.desc ? 'descending' : 'ascending'
   let Icon = ChevronsUpDown
diff --git a/frontend/src/shared/ui/toaster.tsx b/frontend/src/shared/ui/toaster.tsx
index 2907ea1..fb65715 100644
--- a/frontend/src/shared/ui/toaster.tsx
+++ b/frontend/src/shared/ui/toaster.tsx
@@ -21,12 +21,12 @@ function ToastItem({
   message,
   variant,
   onDismiss,
-}: {
+}: Readonly<{
   id: number
   message: string
   variant: 'default' | 'success' | 'error'
   onDismiss: (id: number) => void
-}) {
+}>) {
   const { t } = useTranslation()
 
   useEffect(() => {
diff --git a/frontend/src/theme/ThemeProvider.tsx b/frontend/src/theme/ThemeProvider.tsx
index f69ab0b..effa6fb 100644
--- a/frontend/src/theme/ThemeProvider.tsx
+++ b/frontend/src/theme/ThemeProvider.tsx
@@ -13,7 +13,7 @@ function applyTheme(theme: Theme) {
   root.classList.toggle('dark', resolve(theme) === 'dark')
 }
 
-export function ThemeProvider({ children }: { children: ReactNode }) {
+export function ThemeProvider({ children }: Readonly<{ children: ReactNode }>) {
   const [theme, setThemeState] = useState<Theme>(
     () => (localStorage.getItem(THEME_STORAGE_KEY) as Theme | null) ?? 'dark',
   )