v0.9.1 — fix welcome banner font error

Fixed

• Welcome banner no longer errors with "Font file for the font 'block' could not be found." The banner used ink-big-text, whose cfonts engine loads its font via a runtime require("../fonts/block.json") — a path the single-file bun build bundle can't resolve, so every node-bundled install (0.7.0–0.9.0) printed the cfonts error instead of the wordmark. The "syncthis" wordmark is now a static, pre-rendered string in welcome.tsx (gradient preserved), with no runtime font dependency. Dropped ink-big-text/cfonts from the bundle. Also refreshed the banner's stale mirror command description.