fix(ci): declare @chenglou/pretext dependency in package.json

src/lib/utils/textMeasure.ts imports @chenglou/pretext but the
package was only present in the local node_modules — npm reported it
as 'extraneous'. npm ci in CI refuses to install anything that isn't
declared, so vite build fell over at the Rollup resolve step:

    [vite]: Rollup failed to resolve import '@chenglou/pretext' from
    'src/lib/utils/textMeasure.ts'.

Pins to the version that was already installed locally (0.0.5) and
regenerates package-lock.json. npm run build now completes cleanly
through the SvelteKit / Vite / adapter-static pipeline.

Co-authored-by: jars <jakejars@users.noreply.github.com>

package.json

@@ -14,6 +14,7 @@
   },
   "license": "MIT",
   "dependencies": {
+    "@chenglou/pretext": "0.0.5",
     "@tauri-apps/api": "^2",
     "@tauri-apps/plugin-dialog": "^2.6.0",
     "@tauri-apps/plugin-global-shortcut": "^2.3.1",