feat(phase2): per-board access control UI

- BoardAccessControl component with user/group autocomplete
- BoardShareDialog modal with copy link, guest toggle, quick add
- Board permissions REST API (GET/POST/DELETE)
- Access indicators on BoardCard (lock, globe, shared icons)
- Guest access toggle in board editor with status preview
- Enhanced PermissionEditor with search autocomplete
- i18n translations for all new strings (EN/RU)

src/lib/i18n/en.json

@@ -52,6 +52,25 @@
   "board.creating": "Creating...",
   "board.default_board": "Default board",
   "board.guest_accessible": "Guest accessible",
+  "board.guest_access_title": "Guest Access",
+  "board.guest_access_description": "When enabled, this board is visible to unauthenticated visitors without requiring sign-in.",
+  "board.guest_access_enabled": "This board is publicly accessible",
+  "board.guest_access_disabled": "This board is private",
+  "board.permissions_title": "Permissions",
+  "board.permissions_description": "Manage who can view, edit, or administer this board.",
+  "board.access_grant": "Grant Access",
+  "board.access_search_placeholder": "Search...",
+  "board.access_loading": "Loading permissions...",
+  "board.access_none": "No permissions configured for this board.",
+  "board.access_private": "Private",
+  "board.access_shared": "Shared",
+  "board.share": "Share",
+  "board.share_title": "Share \"{name}\"",
+  "board.share_copy_link": "Copy Link",
+  "board.share_copied": "Copied!",
+  "board.share_guest_description": "Anyone with the link can view this board without signing in.",
+  "board.share_add_access": "Add People or Groups",
+  "board.share_current_access": "Current Access",
 
   "section.title_label": "Title",
   "section.icon_label": "Icon",
@@ -192,6 +211,7 @@
   "admin.perm_level_column": "Level",
   "admin.perm_action_column": "Action",
   "admin.perm_none": "No permissions configured.",
+  "admin.perm_search_placeholder": "Type to search...",
 
   "search.placeholder": "Search apps and boards...",
   "search.trigger": "Search...",

src/lib/i18n/ru.json

@@ -52,6 +52,25 @@
   "board.creating": "\u0421\u043e\u0437\u0434\u0430\u043d\u0438\u0435...",
   "board.default_board": "\u0414\u043e\u0441\u043a\u0430 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e",
   "board.guest_accessible": "\u0414\u043e\u0441\u0442\u0443\u043f\u043d\u0430 \u0433\u043e\u0441\u0442\u044f\u043c",
+  "board.guest_access_title": "\u0413\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0434\u043e\u0441\u0442\u0443\u043f",
+  "board.guest_access_description": "\u041f\u0440\u0438 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0438 \u044d\u0442\u0430 \u0434\u043e\u0441\u043a\u0430 \u0432\u0438\u0434\u043d\u0430 \u043d\u0435\u0430\u0432\u0442\u043e\u0440\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u044b\u043c \u043f\u043e\u0441\u0435\u0442\u0438\u0442\u0435\u043b\u044f\u043c \u0431\u0435\u0437 \u0432\u0445\u043e\u0434\u0430 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0443.",
+  "board.guest_access_enabled": "\u042d\u0442\u0430 \u0434\u043e\u0441\u043a\u0430 \u043e\u0431\u0449\u0435\u0434\u043e\u0441\u0442\u0443\u043f\u043d\u0430",
+  "board.guest_access_disabled": "\u042d\u0442\u0430 \u0434\u043e\u0441\u043a\u0430 \u043f\u0440\u0438\u0432\u0430\u0442\u043d\u0430",
+  "board.permissions_title": "\u041f\u0440\u0430\u0432\u0430 \u0434\u043e\u0441\u0442\u0443\u043f\u0430",
+  "board.permissions_description": "\u0423\u043f\u0440\u0430\u0432\u043b\u044f\u0439\u0442\u0435, \u043a\u0442\u043e \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u043e\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0442\u044c, \u0440\u0435\u0434\u0430\u043a\u0442\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0438\u043b\u0438 \u0430\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u044d\u0442\u0443 \u0434\u043e\u0441\u043a\u0443.",
+  "board.access_grant": "\u041d\u0430\u0437\u043d\u0430\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f",
+  "board.access_search_placeholder": "\u041f\u043e\u0438\u0441\u043a...",
+  "board.access_loading": "\u0417\u0430\u0433\u0440\u0443\u0437\u043a\u0430 \u043f\u0440\u0430\u0432...",
+  "board.access_none": "\u041f\u0440\u0430\u0432\u0430 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u0434\u043b\u044f \u044d\u0442\u043e\u0439 \u0434\u043e\u0441\u043a\u0438 \u043d\u0435 \u043d\u0430\u0441\u0442\u0440\u043e\u0435\u043d\u044b.",
+  "board.access_private": "\u041f\u0440\u0438\u0432\u0430\u0442\u043d\u0430\u044f",
+  "board.access_shared": "\u041e\u0431\u0449\u0430\u044f",
+  "board.share": "\u041f\u043e\u0434\u0435\u043b\u0438\u0442\u044c\u0441\u044f",
+  "board.share_title": "\u041f\u043e\u0434\u0435\u043b\u0438\u0442\u044c\u0441\u044f \u00ab{name}\u00bb",
+  "board.share_copy_link": "\u041a\u043e\u043f\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0441\u0441\u044b\u043b\u043a\u0443",
+  "board.share_copied": "\u0421\u043a\u043e\u043f\u0438\u0440\u043e\u0432\u0430\u043d\u043e!",
+  "board.share_guest_description": "\u041b\u044e\u0431\u043e\u0439 \u0441 \u044d\u0442\u043e\u0439 \u0441\u0441\u044b\u043b\u043a\u043e\u0439 \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u043e\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0442\u044c \u0434\u043e\u0441\u043a\u0443 \u0431\u0435\u0437 \u0432\u0445\u043e\u0434\u0430.",
+  "board.share_add_access": "\u0414\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u043b\u044e\u0434\u0435\u0439 \u0438\u043b\u0438 \u0433\u0440\u0443\u043f\u043f\u044b",
+  "board.share_current_access": "\u0422\u0435\u043a\u0443\u0449\u0438\u0439 \u0434\u043e\u0441\u0442\u0443\u043f",
 
   "section.title_label": "\u0417\u0430\u0433\u043e\u043b\u043e\u0432\u043e\u043a",
   "section.icon_label": "\u0418\u043a\u043e\u043d\u043a\u0430",
@@ -192,6 +211,7 @@
   "admin.perm_level_column": "\u0423\u0440\u043e\u0432\u0435\u043d\u044c",
   "admin.perm_action_column": "\u0414\u0435\u0439\u0441\u0442\u0432\u0438\u0435",
   "admin.perm_none": "\u041f\u0440\u0430\u0432\u0430 \u043d\u0435 \u043d\u0430\u0441\u0442\u0440\u043e\u0435\u043d\u044b.",
+  "admin.perm_search_placeholder": "\u041d\u0430\u0447\u043d\u0438\u0442\u0435 \u0432\u0432\u043e\u0434\u0438\u0442\u044c...",
 
   "search.placeholder": "\u041f\u043e\u0438\u0441\u043a \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u0438 \u0434\u043e\u0441\u043e\u043a...",
   "search.trigger": "\u041f\u043e\u0438\u0441\u043a...",