feat: add semantic-release for automated versioning and help dialog

- Set up semantic-release with zero-touch CI pipeline on push to main
- Add version sync script to keep all package.json files and APP_VERSION
  constant in sync automatically
- Consolidate Docker publishing into single tag-triggered workflow that
  pushes to both Docker Hub and ghcr.io with semver tags
- Add help dialog with keyboard shortcuts, getting started guide, and
  resource links
- Sync all versions to 0.2.1 to match Docker Hub latest

packages/ai/src/bridge.ts

@@ -25,8 +25,8 @@ function extractPythonError(error: unknown): string {
       stdout?: string;
       message?: string;
     };
-    // Try to parse JSON error from stderr or stdout
-    for (const output of [execError.stderr, execError.stdout]) {
+    // Try stdout first (Python scripts write JSON errors there), then stderr
+    for (const output of [execError.stdout, execError.stderr]) {
       if (output) {
         try {
           const parsed = JSON.parse(output.trim());