Improve inbox, thread, nav, and settings UX

[wparad]

Summary

Addresses a batch of UI/UX issues across the inbox, thread view, navigation drawer, and Settings, plus adds realtime updates.

• Signals: MarkdownText now registers Markwon's HtmlPlugin, so HTML signal bodies render instead of showing raw tags; the collapsed one-line signal preview strips HTML to plain text.
• Header gap: MainActivity now calls enableEdgeToEdge() explicitly. Without it, on API < 35 (edge-to-edge is auto-forced only on API 35+) the window wasn't edge-to-edge while TopAppBar's own status-bar inset padding assumed it was — reserving the status bar's height twice.
• Archive/Delete: Archive now requires confirmation (Inbox swipe row, bulk selection, and Thread top bar). Delete moved into an overflow menu and also requires confirmation, including newly-wired bulk archive/delete in Inbox's selection mode.
• Swipe gesture: the background action row now aligns its icons to the edge the swipe is actually revealing instead of always docking right. Positional threshold made explicit at 50%.
• Inbox tabs: added Archived/All tabs (mirrors the web app's InboxTabBar), backed by a nullable-status paging path with per-status local cache clearing.
• Hamburger menu: fixed the blank Accounts list (a LazyColumn nested in an unbounded Column renders nothing). Added a full Resources feature (API, repo, screen) that was entirely missing. Reordered the drawer with a profile row at the bottom. Added count badges for Inbox/Drafts/Quarantine/Resources.
• Settings: Theme is now the first tab; Stats is its own tab; sub-tab lists get a visible scroll indicator; Aliases are editable; Email & Forwarding gained compose-behavior and retention controls. Theme preview tiles now show their base color swatch plus its hex value, so the difference between flavors reads as concrete rather than a subtle mood difference (the four Catppuccin flavors are intentionally a coordinated family, so at a glance the dark three can look similar — this makes the actual difference undeniable).
• Labels: added a full edit dialog (name, color, icon, apply instructions) with delete moved inside it.
• Realtime: added a WebSocket client mirroring the web app's SharedWorker (wss://<api>?token=&accountId=, 25s ping, backoff reconnect) that runs while the app is foregrounded — no FCM/push notification setup required. thread:updated events refresh the thread through the existing repository into Room, so every Flow-backed list and badge already listening to that store (which is how badges/lists work throughout this app — Room-backed, not page-local caches) picks up the change automatically.
• Confirmations: swept the app for destructive actions without one — added to Clear logs and Remove forwarding address, on top of the archive/delete/bulk-action confirmations above.

Notes

• Catppuccin theme defaulting to system light/dark and the four distinct flavor palettes were already correctly implemented in the existing code — verified, no changes needed there. The four flavors are a genuinely coordinated family (same accent-color relationships, differing mainly in background contrast), so the dark three can look similar at a glance — the new hex-labeled swatch makes the actual difference in values undeniable even where the vibe is similar.
• Couldn't run a full Gradle/Android build in this environment (no Android SDK available), so changes are verified by careful manual review rather than a compiler — CI (Validate) is green on the latest commit.

Test plan

• Build and run on a device/emulator
• Verify signal HTML renders in an inbound email's expanded view
• Verify no gap above the top app bar on an API < 35 device
• Swipe an inbox row both directions; confirm icons appear at the correct edge and archive/delete show confirmations
• Switch Inbox/Archived/All tabs and confirm counts and content are correct
• Long-press to enter selection mode, select multiple threads, and bulk archive/delete with confirmation
• Open the hamburger menu with 2+ accounts and confirm the Accounts list renders
• Visit Resources from the drawer
• Edit a label's apply instructions and confirm it persists
• Change After-send action / retention duration in Settings and confirm they save
• With two devices/sessions signed into the same account, confirm a change on one shows up live on the other without a manual refresh
• Clear logs / remove a forwarding address and confirm each asks for confirmation first

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