Mesh Code 0.1.4

The feedback release — tell us how it's going without leaving the app.

In-app beta feedback. The sidebar's beta card now opens a centered
dialog: rate Mesh Code with a tap (1–5 stars) and optionally say what's
working and what's broken. About 15 seconds, and the only required part
is the tap.

No browser, no account. Submissions are relayed in the background by
the local engine — you never leave the app, and nothing asks you to sign
in anywhere.

Under the hood. New token-gated /api/feedback route on the engine;
the renderer's CSP stays as locked down as before.