Stage 7 polish: app shell + nav + lobby + settings (Parts A/B/C)

- Screen.svelte shell: nav bar grows, ad+content+tabbar pinned bottom (mobile feel)
- AdBanner.svelte + banner.ts rotator (params, mock long/short, linkify); Header CSS chevron + grow; Menu (bigger CSS hamburger); TabBar + HoldConfirm shared components; user-select:none
- Lobby: hide-empty sections, tab order New/Tournaments/Stats, place-based result badges (result.ts)
- Settings: Board style > Labels (beginner/classic/none) + prefs plumbing (boardlabels.ts); i18n keys + ru mirror

ui/src/lib/i18n/en.ts

@@ -76,6 +76,20 @@ export const en = {
   'game.wordIllegal': '“{word}” is not valid',
   'game.complain': 'Disagree',
   'game.complaintSent': 'Thanks, sent for review.',
+  'game.confirm': 'Ok',
+  'game.check': 'Check',
+  'game.checkWait': 'Please wait a moment.',
+  'game.noHintOptions': 'No options with your letters.',
+  'game.scores': 'Scores: {n}',
+
+  'result.victory': 'Victory',
+  'result.defeat': 'Defeat',
+  'result.draw': 'Draw',
+  'result.place2': 'II place',
+  'result.place3': 'III place',
+  'result.place4': 'IV place',
+  'result.yourMove': 'Your move',
+  'result.oppMove': "Opponent's move",
 
   'chat.placeholder': 'Quick message…',
   'chat.send': 'Send',
@@ -96,6 +110,11 @@ export const en = {
   'settings.themeLight': 'Light',
   'settings.themeDark': 'Dark',
   'settings.language': 'Interface language',
+  'settings.boardStyle': 'Board style',
+  'settings.boardLabels': 'Bonus labels',
+  'settings.labelsBeginner': 'Beginner',
+  'settings.labelsClassic': 'Classic',
+  'settings.labelsNone': 'None',
   'settings.reduceMotion': 'Reduce motion',
 
   'about.title': 'About',
@@ -108,6 +127,7 @@ export const en = {
   'error.not_your_turn': "It is not your turn.",
   'error.illegal_play': 'That is not a legal play.',
   'error.hint_unavailable': 'No hints available.',
+  'error.no_hint_available': 'No options with your letters.',
   'error.chat_rejected': 'Message rejected (too long or contains contact info).',
   'error.game_finished': 'This game is finished.',
   'error.not_a_player': 'You are not a player in this game.',