docs: veracity pass, screenshot enrichment, and screenshot pipeline split

Audit the user docs for accuracy against the code, enrich them with
component-level screenshots, and separate the doc-screenshot generation
path from the visual-regression gate so doc framing no longer churns test
baselines.

Veracity fixes (claims verified against code):
- connections: removed 3 screenshots that were from the unrelated mPWRD/nymea
  WiFi-provisioning app and rewrote the TCP/IP section to match the real
  Network transport flow (mDNS scan + manual IP:4403); replaced the BLE
  "scan" image (it was the wifi-provision splash) with the real device list.
- nodes: online window is 2h (not 15min); binary online/offline, no "away" tier.
- map: markers are identity-colored node chips, not online-status colors.
- node-metrics & signal-meter: signal quality is preset-relative SNR, not
  fixed thresholds.
- messages: max message length is 200 bytes (not 237/230).
- telemetry: CO2 bands aligned to Co2Severity (Good/Stuffy/Poor/Unsafe/Evacuate).
- translate: locale dirs use {lang}-r{REGION}.

New pages: Home Screen Widget, Help & In-App Docs (Chirpy on-device AI).

Screenshot enrichment + tighter framing: added IAQ scale, firmware verifying,
TAK local server, quick-chat dialog; cropped firmware states and connections
panes to component-level views instead of full-screen frames.

Pipeline split (new :docs-screenshots module, generate-only, not CI-gated):
holds doc-framed compositions so reframing a doc image never moves a regression
baseline; :screenshot-tests stays the gate. copyDocsScreenshots aggregates
both modules. Updated CI filter, governance advisories, dev docs, and the
testing-ci skill.

Translated docs re-sync from the English source via the scheduled Crowdin job.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/en/developer/codebase.md

@@ -56,7 +56,8 @@ Meshtastic-Android/
 │   ├── testing/
 │   └── ui/
 ├── baselineprofile/        # Baseline Profile generation for :androidApp
-├── screenshot-tests/       # Compose Preview screenshot tests
+├── screenshot-tests/       # Compose Preview screenshot tests (visual-regression gate)
+├── docs-screenshots/       # Doc-framed composition screenshots (generate-only, not CI-gated)
 ├── build-logic/            # Convention plugins and build helpers
 │   ├── convention/
 │   └── flatpak/