Quit used to mimic the Back button (history.back() whenever a referrer
existed), but every in-app entry and every tool switch is a hard
location.assign that pushes a history entry — so after schematic ⇄ pcb
switches, one step back is another editor, not the page the user left from.
Quit now navigates to the project overview explicitly (projectPath; "/" for
lib editors), which also covers deep links uniformly.
New VITE_QUIT_ORIGIN ("" ⇒ same-origin) lets the backed editor deployment
exit to the management app's project page instead of the standalone's own;
build-editor.mjs sets it (override with --app-origin).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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