feat: BIP-39 master seed for unified key derivation

Replace fragmented random key generation with a single 24-word BIP-39
mnemonic that deterministically derives all node keys: Ed25519 (DID),
secp256k1 (Nostr/Bitcoin), BIP-84 xprv (Bitcoin Core), and LND aezeed
entropy. New onboarding flow: seed generate → word verification → identity
naming. Restore path enabled via 24-word entry. Includes seed RPC handlers,
mock backend support, LND/Bitcoin Core wallet-from-seed integration, and
UI polish across settings and discover views.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/user-walkthrough.md

@@ -247,14 +247,116 @@ Each app detail page shows:
 
 ### Controller / Gamepad Navigation
 
-> **Screenshot**: Dashboard with visible focus indicators showing controller navigation in action.
+Archipelago supports Xbox-style controller navigation throughout the UI.
 
-Archipelago supports Xbox-style controller navigation:
-- **D-pad / Arrow keys**: Navigate between elements
-- **A / Enter**: Select / activate
-- **B / Escape**: Go back
-- **Bumpers**: Switch between pages
-- Focus indicators show the current selection
+#### Global Controls
+
+| Button | Action |
+|--------|--------|
+| D-pad Up/Down | Navigate between elements |
+| D-pad Left/Right | Move between zones (sidebar ↔ content) |
+| A / Enter | Select / activate / enter container |
+| B / Escape | Go back / exit container / return to sidebar |
+
+#### Navigation Zones
+
+**Sidebar** (left column — always visible on desktop):
+- Up/Down = move between items (wraps), auto-navigates page links
+- Right = enter main content (first container, or first button on container-free pages)
+- Left = nothing
+
+**Nav Bar** (mode-switcher tabs at top of content — e.g. My Apps / App Store / Services):
+- Left/Right = move between tabs
+- Down = jump to first card/container below (remembers tab for Up return)
+- Up = nothing (Escape to sidebar)
+- Left from leftmost = sidebar
+
+**Container Grid** (card tiles — Apps, Discover, Network, Home):
+- Arrows = spatial navigation between cards
+- Enter = primary action (Install, Launch, or enter inner controls)
+- Escape = sidebar
+- Left from leftmost card = sidebar
+- Up from top row = return to remembered nav bar tab
+
+**Inside Container** (after Enter on a card — inner buttons/controls):
+- Arrows = move between inner controls
+- Escape = exit back to the card
+- Cannot leave via arrows — must Escape first
+
+**Text Inputs** (search bars, form fields):
+- Up/Down = exit field, navigate to nearest element
+- Enter = submit (clicks the next button)
+- Left/Right = cursor movement (exits field at edges)
+
+#### Per-Page Mapping
+
+**Home** (`/dashboard`)
+- Right from sidebar → first status card
+- D-pad navigates between status cards spatially
+- Enter on card → navigates to that section
+
+**My Apps** (`/dashboard/apps`)
+- Right from sidebar → first app card
+- D-pad navigates app card grid spatially
+- Enter on card → app details page
+- Enter on focused card with Launch button → launches app
+
+**App Store / Discover** (`/dashboard/discover`)
+- Right from sidebar → first featured card
+- D-pad navigates card grid (Sovereignty Stack + All Applications)
+- Down from nav tabs → first card below
+- Up from top card → returns to last-focused tab
+- Enter on card → app detail / install
+- Cards lift on hover/focus (same as My Apps)
+
+**Network** (`/dashboard/server`)
+- Right from sidebar → Quick Actions card
+- D-pad navigates between cards: Quick Actions → Local Network / Web3 → Network Interfaces / Tor Services
+- Enter on Quick Actions → enters inner buttons (Restart, Check Tor, View Logs)
+- Escape from inner buttons → back to card
+- All cards lift on hover/focus
+
+**Settings** (`/dashboard/settings`) — **Linear navigation, no containers**
+- Right from sidebar → first button (server name row)
+- D-pad Up/Down steps through ALL buttons/controls top-to-bottom:
+  1. Server Name / What's New
+  2. Copy DID
+  3. Copy Onion Address
+  4. Change Password
+  5. Enable/Disable 2FA
+  6. Logout
+  7. Choose Language
+  8. Login with Claude
+  9. AI Data Access toggles (each enable/disable row)
+  10. Manage Updates
+  11. Webhook URL input
+  12. Webhook Secret input
+  13. Container Crash / Update Available toggles
+  14. Disk Space Warning / Backup Complete toggles
+  15. Save Configuration / Send Test Webhook
+  16. Enable Beta Telemetry
+  17. Create Backup
+  18. Export Channel Backup
+  19. Network Diagnostics
+  20. Reboot
+  21. Factory Reset
+- Enter = activates the focused button/toggle
+- Escape / Left = sidebar
+
+**Mesh** (`/dashboard/mesh`)
+- Right from sidebar → Device status card (left column)
+- D-pad navigates between left-column containers (Device, Actions, Peers)
+- Enter on peer → opens chat, auto-focuses message input
+- Type message + Enter = send
+- Escape = close chat / back to sidebar
+
+**Cloud** (`/dashboard/cloud`)
+- Right from sidebar → first folder/file card
+- D-pad navigates file grid spatially
+- Enter = open folder / file details
+
+**Detail Pages** (app details, marketplace app details):
+- Escape / B = go back to previous page
 
 ---