Desktop v0.1.5: fix blank second launch when authed

[ericflo]

Problem

After signing in with v0.1.4, closing and re-opening the app left users with no visible window and a tray that felt dead. "It's like it's busted if you're authed or something."

Root cause

The onboarding wizard saves auto_start: true on finish (ui/index.html:940). Combined with a saved worker_secret, this matched the intentional "silent tray-only launch" branch in main.rs:

if auto_start {
    // spawn worker, do NOT show window
} else if let Some(window) = app.get_webview_window("main") {
    let _ = window.show();
    // ...
}

So every wizard-completed user became a silent-tray user on the next launch. Compounding it:

• WindowEvent::CloseRequested was unhandled, so the red-X on macOS could destroy the window (not just hide it)
• RunEvent::Reopen was unhandled, so clicking the Dock icon on an already-running instance did nothing visible — the canonical macOS way to come back to a hidden-window app

Fix

Decouple worker auto-start from window visibility:

• Always show the window on launch. auto_start still starts the worker daemon automatically, but doesn't hide the UI
• WindowEvent::CloseRequested → hide-to-tray. The window is hidden and the close is prevented, so Dock/tray reopen lands on the same session
• RunEvent::Reopen handler (macOS only) re-shows + focuses the main window when the user clicks the Dock icon or re-launches the app while a copy is running
• Quit stays reachable via the tray menu and Cmd+Q (RunEvent::ExitRequested)

Bumps desktop crate + tauri.conf.json to 0.1.5. Refreshed Cargo.lock and CHANGELOG.md.

Test plan

• Complete onboarding wizard → worker connects
• Close the window with red X → window disappears, tray icon stays, app keeps running
• Click Dock icon → window reappears
• Quit app, re-launch → window appears with worker auto-starting in the background
• Tray menu items (Open Dashboard, Settings, Check for Updates, Quit) all work
• Cmd+Q fully quits the app

Release

Once merged, push desktop-v0.1.5 tag to trigger the signed macOS / Windows / Linux release build.

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