feat(ui): friends list as lobby-style rows with kebab + confirm modals

Settings -> Friends previously rendered each friend as a bordered card with
two always-visible text buttons (Remove / Block) that fired immediately. Rework
the whole screen to the lobby's visual language: one-line rows split by
hairline separators across all three sections (friends, incoming requests,
blocked).

Each friend row gains a right-hand kebab that slides the row open to reveal two
icon actions split by a vertical divider -- block (no-entry) and remove (cross)
-- mirroring the lobby's slide-to-reveal. Both actions now require a
confirmation modal; since the slide moves a short name off-screen, the modal
keeps a generic title and shows the friend's name in the body, above the
buttons, so a long name cannot stretch the sheet. Incoming keeps its
accept/decline buttons and blocked keeps unblock, inline on their rows.

Add the friends.actions / friends.blockConfirm / friends.unfriendConfirm keys
to both i18n catalogs and document the flow in FUNCTIONAL (+_ru).

ui/src/lib/i18n/en.ts

@@ -227,6 +227,9 @@ export const en = {
   'friends.decline': 'Decline',
   'friends.unfriend': 'Remove',
   'friends.block': 'Block',
+  'friends.actions': 'Actions',
+  'friends.blockConfirm': 'Block this player?',
+  'friends.unfriendConfirm': 'Remove from friends?',
   'friends.add': 'Add a friend',
   'friends.addFromGame': 'Add to friends',
   'friends.blockFromGame': 'Block player',

ui/src/lib/i18n/ru.ts

@@ -228,6 +228,9 @@ export const ru: Record<MessageKey, string> = {
   'friends.decline': 'Отклонить',
   'friends.unfriend': 'Удалить',
   'friends.block': 'Заблокировать',
+  'friends.actions': 'Действия',
+  'friends.blockConfirm': 'Заблокировать?',
+  'friends.unfriendConfirm': 'Удалить из друзей?',
   'friends.add': 'Добавить друга',
   'friends.addFromGame': 'В друзья',
   'friends.blockFromGame': 'Заблокировать',