Replace AddColumnDialog with full-screen App Drawer overlay (Cmd+K).
Screens organized by category (Social, Long-Form, Discovery, Identity,
Play) with instant search, keyboard navigation (arrows + Enter), and
open-column indicators in Deck mode. Works in both Single Pane and
Deck layout modes.
- Add AppDrawer.kt with ScreenCategory, LAUNCHABLE_SCREENS registry
- Add SinglePaneState for hoisted single-pane navigation
- Wire Cmd+K shortcut, redirect Cmd+T to drawer
- Add "More" button to SinglePaneLayout nav rail
- Delete AddColumnDialog.kt
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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