feat(x): right-click context menus across the app

[hrsvrn]

What

Adds right-click context menus to the surfaces that were missing them, plus the native text-editing menu Electron doesn't provide by default.

Renderer (shared Radix ContextMenu, existing action handlers)

• Email inbox rows — Open/Close thread, Mark read/unread, Mark important/not important (section-aware), Archive, Delete. Mirrors the hover buttons.
• Browser tab strip — Close Tab, Close Other Tabs, Close Tabs to the Right (and Close All where single-tab close is allowed). Implemented in the generic TabBar and funneled through the existing onCloseTab callback, so no parent changes were needed.
• Sidebar recent chats — Pin/Unpin, Rename, Delete; mirrors the kebab dropdown, matching the pinned-apps rows that already had a context menu.
• Meetings notes table — Open, Copy Path, Open in file manager, inline Rename, Delete. Wired to App's knowledgeActions through a new optional actions prop, so rename keeps wiki-link rewriting and delete goes to trash.
• Live notes table — Open note, Activate/Deactivate, Stop run (while running).

Main process

• New context-menu.ts: native right-click menu for text editing and selections — cut/copy/paste/select-all, spellcheck suggestions + Add to Dictionary, Copy Link Address. Attached to the main window, the quick-ask window, and embedded browser tabs. The in-DOM Radix menus call preventDefault() on contextmenu, which suppresses this event entirely, so the two systems never conflict.

Fix

• BrowserPane's blocking-overlay detection treated opacity: 0 as "no overlay", but Radix overlays mount at opacity 0 (enter animation) and the check runs exactly once on the mount frame — so menus/dropdowns/dialogs opened over the embedded browser were clipped by the native WebContentsView instead of hiding it. Dropped the opacity condition; closing overlays are already excluded via data-state="open".

Testing

• npm run deps, npm run lint, npm run typecheck (plus a manual tsc over apps/main) all pass.
• Manually verified the browser tab menu now renders unclipped with the view hidden while open.