feat(desktop): tray workspace actions, startup settings, and notification levels

[skevetter]

Summary

Implements the DevSy tray utility proposal (Electron only) as a single PR. Refs #1260, refs #1207.

• Startup settings: "Run at startup" plus the dependent "Open to tray on startup" toggle in DevSy Settings (canonical), mirrored as native checkboxes in the tray Preferences submenu. "Open to tray" affects automatic login launches only, never manual launches.
• Tray workspace actions: the tray lists the 5 most recently used workspaces with Start/Stop text verbs and status dots, plus a "View all workspaces in DevSy" overflow item. Entries are disabled during transitions, deduplicated, and report no optimistic success; destructive confirmations route to the app.
• Notifications: Off / Failures only (default) / All terminal outcomes, controlled from Settings.
• Linux: Tier 1 / Tier 2 status-notifier matrix, and Flatpak autostart through the XDG Background portal.

Everything the proposal lists under "What the tray will NOT do" is left out.

Implementation-bounded decisions (resolved per the proposal's recommendation)

1. Stop confirmation: the app's existing rule is that Stop has no confirmation (only delete, rebuild, and reset confirm). The tray reuses that rule and stops gracefully; no new dialog was added.
2. Tier 2 Linux CI image: Xfce. A new tray-smoke-xfce CI job runs xfce4-panel under Xvfb on ubuntu-latest and asserts SNI registration via busctl (RegisteredStatusNotifierItems). Its first validation happens in CI; it could not be run locally (no sudo in the dev environment).

Notes

• User-facing copy avoids contractions (D13); code comments kept minimal (D14).
• Flatpak autostart uses the portal's RequestBackground. The portal has no disable call, so turning startup off removes the host autostart file instead (the manifest's filesystem=home access makes it visible). A portal denial never persists runAtStartup.
• Settings are main-process canonical (JSON in userData); the renderer caches and rolls back optimistically, and the tray mirrors the same values.

Test state

• Local on this exact tree: 478 vitest tests pass (50 files), svelte-check reports 0 errors, electron:build completes cleanly.
• tray-smoke-xfce is new and will be validated by its first CI run on this PR.

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