fix(app): iOS HIG Phase 3 — content & settings touch targets (44px minimum)
- Detail views: back buttons expanded across all 8 detail components
- SettingsModal/SettingsPanel: close, edit/delete, tab buttons expanded
- MemoryPanel: edit/delete buttons + gap fix
- PersonaSelector: close button expanded
- PluginMarketplace: settings gear button expanded
- NostrGrid: sub-tab and filter buttons expanded
- PlayerBar, MapRenderer, BranchSwitcher, ZapDialog, NostrDMs,
NostrThread, NostrArticles, DesignSystemDetail/Grid: all remaining
small interactive buttons expanded to 44px minimum
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
