Build css usage fixes

Author: Alexey Perov

app/src-tauri/tauri.conf.json

@@ -19,7 +19,7 @@
       }
     ],
     "security": {
-      "csp": "default-src 'self' ipc: http://ipc.localhost; img-src 'self' asset: http://asset.localhost https://asset.localhost blob: data:",
+      "csp": "default-src 'self' ipc: http://ipc.localhost; style-src 'self' 'unsafe-inline'; img-src 'self' asset: http://asset.localhost https://asset.localhost blob: data:",
       "assetProtocol": {
         "enable": true,
         "scope": {

specs/changelog.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## 2026-06-03 — CodeMirror layout in production builds
+
+- **Tauri CSP:** Add `style-src 'self' 'unsafe-inline'` so CodeMirror 6 runtime theme injection works in `tauri build` (fixes gutter/line numbers rendering as document text).
+
 ## 2026-06-03 — Build warnings (ProjectTreeView, ImagePreviewPane)
 
 - **ProjectTreeView:** Wrap `onMoveEntry` / `notify` in closures for Svelte 5 prop reactivity; add `tabindex="0"` on `role="tree"` container.