Stage 7 polish: game rework + board zoom + tests (Parts D/E/F/I)

- Board: fixed-viewport transform-scale zoom (animated) with counter-scaled cqw labels, corner letters, bonus-label modes (boardlabels), contrasting grid lines
- Game: Screen shell + game tab-bar (Draw/Skip/Hint/Shuffle) via HoldConfirm popovers; MakeMove 🏁 + compact popup; rack collapses used slots; hint places tiles on board (placementFromHint) + no_hint_available toast; Scores:N replaces Hints; history slide-down (swipe/click, scroll-locked); check-word alphabet/length limit + in-memory cache + 5s throttle
- backend: no_hint_available result code split + test
- vitest: banner rotator + linkify, resultBadge, boardlabels, placementFromHint (29 tests); Playwright smoke updated; prod bundle ~74 KB gzip

ui/src/lib/result.test.ts

@@ -0,0 +1,57 @@
+import { describe, expect, it } from 'vitest';
+import { resultBadge } from './result';
+import type { GameView, Seat } from './model';
+
+const seat = (s: number, accountId: string, score: number, isWinner = false): Seat => ({
+  seat: s,
+  accountId,
+  displayName: accountId,
+  score,
+  hintsUsed: 0,
+  isWinner,
+});
+
+function game(seats: Seat[], status = 'finished', toMove = 0): GameView {
+  return {
+    id: 'g',
+    variant: 'english',
+    dictVersion: 'v1',
+    status,
+    players: seats.length,
+    toMove,
+    turnTimeoutSecs: 0,
+    moveCount: 0,
+    endReason: '',
+    seats,
+  };
+}
+
+describe('resultBadge', () => {
+  it('active: your move vs opponent', () => {
+    const g = game([seat(0, 'me', 5), seat(1, 'a', 3)], 'active', 0);
+    expect(resultBadge(g, 'me')).toEqual({ key: 'result.yourMove', emoji: '🟢' });
+    expect(resultBadge({ ...g, toMove: 1 }, 'me').key).toBe('result.oppMove');
+  });
+
+  it('finished two-player: victory / defeat / draw', () => {
+    expect(resultBadge(game([seat(0, 'me', 300, true), seat(1, 'a', 200)]), 'me')).toEqual({
+      key: 'result.victory',
+      emoji: '🏆',
+    });
+    expect(resultBadge(game([seat(0, 'me', 200), seat(1, 'a', 300, true)]), 'me')).toEqual({
+      key: 'result.defeat',
+      emoji: '🥈',
+    });
+    expect(resultBadge(game([seat(0, 'me', 200), seat(1, 'a', 200)]), 'me')).toEqual({
+      key: 'result.draw',
+      emoji: '🏅',
+    });
+  });
+
+  it('finished four-player: places by score', () => {
+    const last = game([seat(0, 'me', 100), seat(1, 'a', 400, true), seat(2, 'b', 300), seat(3, 'c', 200)]);
+    expect(resultBadge(last, 'me')).toEqual({ key: 'result.place4', emoji: '🏅' });
+    const second = game([seat(0, 'me', 300), seat(1, 'a', 400, true), seat(2, 'b', 200), seat(3, 'c', 100)]);
+    expect(resultBadge(second, 'me')).toEqual({ key: 'result.place2', emoji: '🥈' });
+  });
+});