feat(mobile): list managed Chats in the sessions sheet

Chat sessions without a project were dropped from the mobile session tree
because no registered project owned their directory. The sheet now partitions
sessions like the desktop sidebar and shows Chats as a collapsible section above
the project tree, with the same rows, swipe actions and paging; search results
label them "Chats" instead of the raw directory name.

Claude-Session: https://claude.ai/code/session_017TK5JAYDfT3Fotc23UEg98

packages/ui/src/lib/i18n/messages/tr.ts

@@ -117,6 +117,7 @@ export const dict = {
   'mobile.sessions.section.worktrees': 'Worktree\'ler',
   'mobile.sessions.section.otherProjects': 'Proje değiştir',
   'mobile.sessions.section.projects': 'Projeler',
+  'mobile.sessions.section.chats': 'Sohbetler',
   'mobile.sessions.empty.noProjectsTitle': 'Henüz proje yok',
   'mobile.sessions.empty.noProjectsDescription': 'Kodunuzla sohbet etmeye başlamak için bir proje ekleyin.',
   'mobile.sessions.empty.noSessionsTitle': 'Henüz session yok',