docs: content audit — expand modules, add cross-refs, fix TODOs, polish tone

- Rewrote discovery.md from stub to practical guide covering existing
  tools (traceroute, neighbor info, node list filtering) — no
  unimplemented features documented
- Expanded all 1-liner module entries in settings-module-admin.md with
  descriptions, use cases, settings tables, and tips/warnings
- Replaced 5 TODO screenshot placeholders with descriptive text
- Added description field to all user doc frontmatter for SEO/search
- Added Related Topics cross-reference sections to 10 user docs
- Added Troubleshooting sections to MQTT and telemetry docs
- Added tip/note/warning callouts matching Apple docs quality bar
- Updated last_updated dates across all 26 doc pages

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: jamesarich

docs/developer/adding-a-feature-module.md

@@ -1,7 +1,7 @@
 ---
 title: Adding a Feature Module
 nav_order: 3
-last_updated: 2026-05-12
+last_updated: 2026-05-13
 aliases:
   - new-module
   - feature-module

docs/developer/architecture.md

@@ -1,7 +1,7 @@
 ---
 title: Architecture
 nav_order: 1
-last_updated: 2026-05-12
+last_updated: 2026-05-13
 aliases:
   - layers
   - module-architecture

docs/developer/codebase.md

@@ -1,7 +1,7 @@
 ---
 title: Codebase
 nav_order: 2
-last_updated: 2026-05-12
+last_updated: 2026-05-13
 aliases:
   - repository-layout
   - project-structure

docs/developer/contributing.md

@@ -1,7 +1,7 @@
 ---
 title: Contributing
 nav_order: 8
-last_updated: 2026-05-12
+last_updated: 2026-05-13
 aliases:
   - contributing
   - pull-request

docs/developer/navigation-and-deep-links.md

@@ -1,7 +1,7 @@
 ---
 title: Navigation & Deep Links
 nav_order: 4
-last_updated: 2026-05-12
+last_updated: 2026-05-13
 aliases:
   - deeplinks
   - navigation-3

docs/developer/persistence.md

@@ -1,7 +1,7 @@
 ---
 title: Persistence
 nav_order: 6
-last_updated: 2026-05-12
+last_updated: 2026-05-13
 aliases:
   - room
   - database

docs/developer/testing.md

@@ -1,7 +1,7 @@
 ---
 title: Testing
 nav_order: 7
-last_updated: 2026-05-12
+last_updated: 2026-05-13
 aliases:
   - tests
   - unit-tests

docs/developer/transport.md

@@ -1,7 +1,7 @@
 ---
 title: Transport
 nav_order: 5
-last_updated: 2026-05-12
+last_updated: 2026-05-13
 aliases:
   - ble
   - serial

docs/user/connections.md

@@ -1,7 +1,8 @@
 ---
 title: Connections
 nav_order: 2
-last_updated: 2026-05-12
+last_updated: 2026-05-13
+description: Connect your phone or desktop to a Meshtastic radio via Bluetooth, USB, or TCP/IP.
 aliases:
   - bluetooth
   - usb
@@ -99,5 +100,13 @@ On Desktop (Linux/macOS/Windows), the app supports:
 - **TCP/IP** — for network-connected radios
 - Bluetooth is **not** currently supported on Desktop
 
+See [Desktop App](desktop) for platform-specific details and keyboard shortcuts.
+
+## Related Topics
+
+- [Getting Started](onboarding) — first-launch setup and permissions
+- [Settings — Radio & User](settings-radio-user) — Bluetooth and network configuration
+- [Desktop App](desktop) — desktop-specific connection details
+
 ---
 

docs/user/desktop.md

@@ -1,7 +1,8 @@
 ---
 title: Desktop App
 nav_order: 14
-last_updated: 2026-05-12
+last_updated: 2026-05-13
+description: Install and use the Meshtastic Desktop app on Linux, macOS, and Windows — connections, feature parity, and keyboard shortcuts.
 aliases:
   - desktop
   - linux
@@ -96,9 +97,7 @@ The Desktop app uses the same Compose Multiplatform UI with adaptations for larg
 
 ### Notification Preferences
 
-The Desktop app provides in-app toggles for controlling which notifications are shown — messages, new nodes, and low battery alerts:
-
-<!-- TODO: Add screenshot settings_notifications.png -->
+The Desktop app provides in-app toggles for controlling which notifications are shown — messages, new nodes, and low battery alerts. Access these from **Settings → Notifications** within the app.
 
 ## Building from Source