feat(web): choose where the search sits, and controls no longer select text

- settings get a search position (left, center by default, right); the top bar
  is three zones and the suggestions open towards the free space
- buttons, chips, tabs, menu items and the home screen controls are not
  text-selectable, so clicks and double clicks no longer highlight labels

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

services/api/internal/auth/handler.go

@@ -241,13 +241,14 @@ func MeDTO(u User) gen.Me {
 
 func uiPrefsDTO(p UIPrefs) gen.UiPrefs {
 	return gen.UiPrefs{
-		Theme:        (*gen.UiPrefsTheme)(p.Theme),
-		WaveVariant:  (*gen.UiPrefsWaveVariant)(p.WaveVariant),
-		WebPlayer:    (*gen.UiPrefsWebPlayer)(p.WebPlayer),
-		MobilePlayer: (*gen.UiPrefsMobilePlayer)(p.MobilePlayer),
-		Ambient:      p.Ambient,
-		CrossfadeS:   p.CrossfadeS,
-		Normalize:    p.Normalize,
+		Theme:          (*gen.UiPrefsTheme)(p.Theme),
+		WaveVariant:    (*gen.UiPrefsWaveVariant)(p.WaveVariant),
+		WebPlayer:      (*gen.UiPrefsWebPlayer)(p.WebPlayer),
+		SearchPosition: (*gen.UiPrefsSearchPosition)(p.SearchPos),
+		MobilePlayer:   (*gen.UiPrefsMobilePlayer)(p.MobilePlayer),
+		Ambient:        p.Ambient,
+		CrossfadeS:     p.CrossfadeS,
+		Normalize:      p.Normalize,
 	}
 }
 
@@ -256,6 +257,7 @@ func uiPrefsFromDTO(p gen.UiPrefs) UIPrefs {
 		Theme:        (*string)(p.Theme),
 		WaveVariant:  (*string)(p.WaveVariant),
 		WebPlayer:    (*string)(p.WebPlayer),
+		SearchPos:    (*string)(p.SearchPosition),
 		MobilePlayer: (*string)(p.MobilePlayer),
 		Ambient:      p.Ambient,
 		CrossfadeS:   p.CrossfadeS,