fix: resolve CI test failures - restore missing imports and fix workflow

.gitea/workflows/ci.yml

@@ -2,26 +2,32 @@ name: CI
 
 on:
   push:
-    branches: [main]
+    branches: [main, master]
   pull_request:
-    branches: [main]
+    branches: [main, master]
 
 jobs:
   test:
     runs-on: ubuntu-latest
+
     steps:
       - uses: actions/checkout@v4
 
-      - uses: actions/setup-python@v5
+      - name: Set up Python
+        uses: actions/setup-python@v5
         with:
           python-version: '3.11'
 
       - name: Install dependencies
         run: |
+          python -m pip install --upgrade pip
           pip install -e ".[dev]"
 
       - name: Run tests
-        run: pytest tests/ -v
+        run: |
+          python -m pytest tests/ -v --tb=short
 
-      - name: Run linter
+      - name: Run linting
-        run: ruff check .
+        run: |
+          pip install ruff
+          ruff check .