Phase 4: account switcher UI.
- AccountSwitcherDropdown composable (person icon → dropdown menu)
- Shows all accounts with active checkmark and signer type label
- "Add Account" button at bottom with divider
- DropdownMenu with DpOffset(48dp) to expand right of sidebar
- DeckSidebar now takes account params (activeNpub, allAccounts, callbacks)
- Replaces "A" logo text with account switcher button
- Migration called on startup to populate account list
- Account switch wired through to AccountManager.switchAccount()
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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