Show BanGUI app version in sidebar, fix version tooltips

- Inject __APP_VERSION__ at build time via vite.config.ts define (reads
  frontend/package.json#version); declare the global in vite-env.d.ts.
- Render 'BanGUI v{__APP_VERSION__}' in the sidebar footer (MainLayout)
  when expanded; hidden when collapsed.
- Rename fail2ban version tooltip to 'fail2ban daemon version' in
  ServerStatusBar so it is visually distinct from the app version.
- Sync frontend/package.json version (0.9.0 → 0.9.3) to match
  Docker/VERSION; update release.sh to keep them in sync on every bump.
- Add vitest define stub for __APP_VERSION__ so tests compile cleanly.
- Add ServerStatusBar and MainLayout test suites (10 new test cases).

Docker/release.sh

@@ -62,6 +62,12 @@ fi
 echo "${NEW_TAG}" > "${VERSION_FILE}"
 echo "Version file updated → ${VERSION_FILE}"
 
+# Keep frontend/package.json in sync so __APP_VERSION__ matches Docker/VERSION.
+FRONT_VERSION="${NEW_TAG#v}"
+FRONT_PKG="${SCRIPT_DIR}/../frontend/package.json"
+sed -i "s/\"version\": \"[^\"]*\"/\"version\": \"${FRONT_VERSION}\"/" "${FRONT_PKG}"
+echo "frontend/package.json version updated → ${FRONT_VERSION}"
+
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