#429 feat(tray,ui): show app version + build channel in dashboard and popover

[Anonymous]

Originally created by: Akarsh-Hegde

Summary

• Adds a get_app_info Tauri command returning { version, channel } — version is the binary's baked tauri.conf.json version (what the DMG updater already compares against); channel is dev (debug/tauri dev), staging (baked via a new MERIDIAN_CHANNEL compile-time env var, same option_env! pattern already used for the runtime-manifest/HF-endpoint bakes), or prod (default).
• Bakes MERIDIAN_CHANNEL=staging into the staging release workflow (release-staging.yml) and the build:staging npm script, alongside the existing MERIDIAN_RUNTIME_MANIFEST_URL/MERIDIAN_HF_ENDPOINT bakes. Production leaves it unset.
• Tray popover: a small mono-font line under the footer (tray/src/index.html/app.js/style.css) — muted for prod, colored (purple/amber) for dev/staging.
• Dashboard: a new "About" card in Settings → Account (AccountSection.tsx) showing the same version/channel.

Test plan

• [x] cargo check / cargo fmt --check / cargo clippy -D warnings / cargo test all pass (tray/src-tauri)
• [x] Verified from Tauri's own codegen source (tauri-codegen) that package_info().version reads tauri.conf.json's top-level version field, not Cargo.toml's
• [x] bun test ui/__tests__/popover-health-panel.test.ts passes (8/8)
• [x] tsc --noEmit clean on the touched dashboard files
• [x] Manually ran tauri dev locally (temporary alternate port to avoid clashing with a concurrent dev session) and confirmed the popover footer badge and the Settings → Account "About" card both render v1.69.1 · dev in the dev color
• [x] Pre-push hook suite (fmt, clippy, ui build/tests, security audit, cargo test) passed

🤖 Generated with Claude Code

https://claude.ai/code/session_019UUn5ezNxQMTsebRNKXxRn

[Anonymous]

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[Anonymous]

Ticket changed by: Akarsh-Hegde

• status: open --> closed