feat(diagnostics): active connect-failure triage + Sentry + in-app share (#2)

* feat(diagnostics): active connect-failure triage + Sentry + in-app share

Replaces the opaque "Connection Failed" / "Network request failed" dead-end
with on-device diagnostics that classify *why* a connect attempt failed.

On failure (quick connect and edit-connection test), the app now:
- runs parallel probes: target /global/health, target root, and a public
  204 endpoint (internet reachability check)
- classifies the cause: malformed-url, no-internet, server-unreachable,
  health-failed, tls-error, timeout
- shows a plain-English summary + a "Share report" button that copies a
  full report (target URL, per-probe results w/ error.cause, device/app
  info, recent log ring-buffer) to the clipboard and opens the share sheet
- captures the same structured context to Sentry (auto-upload), gated on
  EXPO_PUBLIC_SENTRY_DSN so dev/CI builds work without secrets

New: src/lib/logbuffer.ts (ring buffer + logger), src/lib/diagnostics.ts
(regex URL parse — Hermes URL is incomplete — probe + report + share),
src/lib/sentry.ts (no-op-without-DSN wrapper, scrubs basic-auth from URLs).

Wired Sentry.wrap around RootLayout and initSentry() at module load.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* ci(sentry): wire Sentry DSN + source-map upload env into build; bump to 0.2.2

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.github/workflows/build.yml

@@ -10,6 +10,11 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    env:
+      EXPO_PUBLIC_SENTRY_DSN: ${{ secrets.EXPO_PUBLIC_SENTRY_DSN }}
+      SENTRY_AUTH_TOKEN: ${{ secrets.SENTRY_AUTH_TOKEN }}
+      SENTRY_ORG: ${{ secrets.SENTRY_ORG }}
+      SENTRY_PROJECT: ${{ secrets.SENTRY_PROJECT }}
     steps:
       - uses: actions/checkout@v4