fix(workspace): single scroll area, drag cleanup, thin note titles with bundled Inter

- the workspace fills the window; only the note scrolls (also on phones, where the
  sideways scroll area used to scroll on its own)
- clear drag state on dragend, calmer sidebar toggle when collapsed
- ship Inter as variable font, light and larger note titles; header shows the
  title only after the big title scrolled away and stays one row on phones
- main builds show the package version without -dev

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/vite.config.ts

@@ -2,7 +2,7 @@ import { defineConfig } from 'vite';
 import react from '@vitejs/plugin-react';
 import { readFileSync } from 'node:fs';
 
-// Shown in the header. Release builds get the git tag (APP_VERSION build argument, e.g. "v0.6.0");
+// Shown in the header. Tag and main builds get APP_VERSION as build argument (e.g. "v0.6.0");
 // other builds show the package version with a "-dev" suffix (Semantic Versioning, see CHANGELOG.md).
 const pkg = JSON.parse(readFileSync(new URL('./package.json', import.meta.url), 'utf8'));
 const appVersion = process.env.APP_VERSION || `v${pkg.version}-dev`;