Refactor and enhance various components and backend features

- Update .gitignore to prevent tracking of local directories and accidental files.
- Improve installation instructions in INSTALLATION.md for faster dependency resolution using `uv`.
- Replace regex-based string replacement with safer `replaceAll` in i18n.js to mitigate ReDoS risks.
- Add documentation for global state key registry in runtimeState.js.
- Prevent timer leaks in toast.js by stopping the cleaner timer when no active toasts remain.
- Use replaceChildren instead of innerHTML for safer DOM manipulation in Viewer_impl.js.
- Update FloatingViewer.js to improve icon handling and enhance generation time display.
- Implement JSON sanitization for NaN/Infinity values in utils.py to ensure valid JSON output.
- Adjust mypy configuration to target Python 3.10.
- Update requirements.txt to specify compatible versions for pywin32.
- Add comprehensive tests for environment variable helpers in test_config.py.

.github/workflows/python-tests.yml

@@ -48,6 +48,25 @@ jobs:
       - name: Audit JS dependencies
         run: npm audit --audit-level=high
 
+  js-test:
+    runs-on: ubuntu-22.04
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Set up Node.js
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
+        with:
+          node-version: "20"
+          cache: "npm"
+
+      - name: Install JS dependencies
+        run: npm ci --ignore-scripts
+
+      - name: Run JS tests (vitest)
+        run: npm run test:js
+
   test:
     runs-on: ubuntu-22.04
     permissions:
@@ -55,7 +74,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.10", "3.12", "3.13", "3.14"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
@@ -80,10 +99,18 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install -r requirements.txt
-          pip install pytest pytest-asyncio
+          pip install pytest pytest-asyncio pytest-cov
 
       - name: Run pytest
-        run: python -m pytest -q
+        run: python -m pytest -q --cov=mjr_am_backend --cov=mjr_am_shared --cov-report=xml --cov-report=term-missing:skip-covered
+
+      - name: Upload coverage report
+        if: matrix.python-version == '3.12'
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-xml
+          path: coverage.xml
+          retention-days: 14
 
   typecheck:
     runs-on: ubuntu-22.04