Add hardened auto-update with immutable release notes artifacts

[zortos293]

This PR implements a production auto-update system for OpenNOW that checks GitHub Releases and prefers immutable versioned release-notes assets, with a full UI in Settings → Miscellaneous.

Main process:

• opennow-stable/src/main/updater.ts: Encapsulates all electron-updater logic, maintains typed in-memory updater state (status, progress, release info), and broadcasts sanitized state to the renderer. Prefers release-notes-v<version>.json from the matching GitHub release tag, with graceful fallback to mutable feed notes.
• opennow-stable/src/main/index.ts: Registers updater IPC handlers for get-state, check, download, install, and skip; initializes updater after settings manager; schedules a quiet background startup check.
• opennow-stable/src/main/settings.ts: Adds autoCheckForUpdates (default true) and skippedUpdateVersion settings with backward-compatible defaults.

Contracts and bridge:

• opennow-stable/src/shared/gfn.ts: Adds UpdaterState, UpdaterStatus, UpdaterReleaseNotesSource, UpdaterDownloadProgress, ReleaseNotesArtifact, and extends OpenNowApi with updater methods and event subscription.
• opennow-stable/src/shared/ipc.ts: Adds UPDATES_GET_STATE, UPDATES_CHECK, UPDATES_DOWNLOAD, UPDATES_INSTALL, UPDATES_SKIP, UPDATES_CLEAR_SKIPPED, and UPDATES_STATE_CHANGED channels.
• opennow-stable/src/preload/index.ts: Wires updater IPC through the preload bridge and exposes onUpdaterStateChanged event.

Renderer:

• opennow-stable/src/renderer/src/App.tsx: Subscribes to updater state changes, hydrates initial state from main process, and passes updaterState down to SettingsPage.
• opennow-stable/src/renderer/src/components/SettingsPage.tsx: Adds an update panel in Miscellaneous showing current version, status, available version/tag, download progress bar with speed, release notes source badge and notes viewer. Provides Check Now, Download, Restart to Install, and Dismiss/Show Again actions.
• opennow-stable/src/renderer/src/styles.css: Adds styles for the update panel, summary cards, progress bar, release notes card, and error box.

Packaging and workflow:

• opennow-stable/package.json: Adds electron-updater dependency, sets electronUpdaterCompatibility: ">=2.16" in build config, and keeps GitHub as the publish provider.
• .github/workflows/release.yml: Ensures build artifacts include *.yml and *.blockmap files (updater metadata). Generates an immutable release-notes-v<version>.json artifact from GitHub's generated notes payload and attaches it to the release; uses the same markdown for the mutable release body.

Behavior:

• Updater is only active in packaged production builds; manual checks in dev return a clear error instead of blocking.
• Startup checks respect autoCheckForUpdates and run on a delay to avoid spam.
• Release notes are fetched solely in the main process, tied to the exact discovered release tag/version.
• Older releases without the notes asset fall back to feed notes automatically.

[capy-ai]

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