fix #13: fix update restart overlapping save-canvas dialog

[blueberrycongee]

Summary

• Properly sequence the update restart flow: dismiss update panel → save canvas → quit → install → relaunch
• Fix app not relaunching after save + update install

Changes

• UpdateModal.tsx: Dismiss the update modal before sending the updater:install IPC, preventing UI overlap
• auto-updater.ts: Replace direct quitAndInstall() calls with window.close() to go through the normal save-canvas flow first. A updateRestartRequested flag tells the before-quit handler to relaunch after installing.
• mac-updater.ts: registerAutoInstallOnQuit now accepts a shouldRelaunch callback so the install script knows whether to reopen the app (user-initiated restart) or silently install (normal quit)

Root cause

The updater:install handler called quitAndInstall() directly, which:

1. Spawned the install script immediately
2. Called app.quit(), which triggered the window's close handler, which showed the save dialog — overlapping with the still-visible update modal
3. The before-quit auto-install handler fired a second install script with relaunch=false, racing with the first one and preventing relaunch

Test plan

• Click Restart on update notification — save dialog appears cleanly without overlap
• After saving, app quits, installs update, and relaunches
• Normal quit (not update) with pending update: installs silently without relaunch
• Cancel save dialog after clicking Restart: app stays open, no install triggered

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