Stage 17 (contour round 4a): quick fixes

- #4 bag label: '{n} in the bag' / 'Bag is empty' (was 'Bag {n}')
- #6 allow a single trailing dot in display names (backend + UI regex + tests)
- #1 double-tap zooms toward the tapped cell, not the top-left
- #8 shuffle fires a short multi-pulse haptic
- #11 highlighted/flashing tiles darken their bottom edge too (shadow joins the flash)
- #13 toast slides up from the bottom and fades out
- #7 hide the logout button (kept wired behind `hidden`)
- #16 admin game seats: left-align numeric columns, clarify the 'Hints used' header

ui/src/lib/i18n.test.ts

@@ -9,8 +9,8 @@ describe('i18n catalog', () => {
   });
 
   it('interpolates parameters', () => {
-    expect(translate('en', 'game.bag', { n: 7 })).toBe('Bag 7');
-    expect(translate('ru', 'game.bag', { n: 7 })).toBe('Мешок 7');
+    expect(translate('en', 'game.bag', { n: 7 })).toBe('7 in the bag');
+    expect(translate('ru', 'game.bag', { n: 7 })).toBe('7 в мешке');
   });
 
   it('maps error codes to keys with a generic fallback', () => {

ui/src/lib/i18n/en.ts

@@ -46,7 +46,8 @@ export const en = {
   'new.find': 'Find a game',
   'new.searching': 'Looking for an opponent…',
 
-  'game.bag': 'Bag {n}',
+  'game.bag': '{n} in the bag',
+  'game.bagEmpty': 'Bag is empty',
   'game.hints': 'Hints {n}',
   'game.yourTurn': 'Your turn',
   'game.waiting': "Waiting for {name}",

ui/src/lib/i18n/ru.ts

@@ -47,7 +47,8 @@ export const ru: Record<MessageKey, string> = {
   'new.find': 'Найти игру',
   'new.searching': 'Ищем соперника…',
 
-  'game.bag': 'Мешок {n}',
+  'game.bag': '{n} в мешке',
+  'game.bagEmpty': 'Мешок пуст',
   'game.hints': 'Подсказки {n}',
   'game.yourTurn': 'Ваш ход',
   'game.waiting': 'Ожидаем {name}',

ui/src/lib/profileValidation.test.ts

@@ -12,7 +12,10 @@ describe('validDisplayName', () => {
     ['Name P._Last', false],
     ['Name  Last', false],
     ['_Name', false],
-    ['Name.', false],
+    ['Anna B.', true],
+    ['Name.', true],
+    ['Name..', false],
+    ['Name_', false],
     ['Name2', false],
     ['', false],
     ['a'.repeat(33), false],

ui/src/lib/profileValidation.ts

@@ -9,9 +9,10 @@ export const maxDisplayName = 32;
 export const maxAwayMinutes = 12 * 60;
 
 // Unicode letters joined by single space / "." / "_" separators, where a "." or "_"
-// may be followed by a single space. No leading/trailing separator and no adjacent
-// separators except "<dot|underscore> <space>". Same rule as the Go displayNameRe.
-const displayNameRe = /^\p{L}+(?:(?:[._] ?| )\p{L}+)*$/u;
+// may be followed by a single space. No leading separator and no adjacent separators
+// except "<dot|underscore> <space>"; a single trailing "." is allowed (Stage 17). Same
+// rule as the Go displayNameRe.
+const displayNameRe = /^\p{L}+(?:(?:[._] ?| )\p{L}+)*\.?$/u;
 
 /** displayNameError returns true when the trimmed name is a valid display name. */
 export function validDisplayName(raw: string): boolean {