Fix pre-commit workflow for push events

- Extract FROM_REF variable to eliminate duplication
- Use github.base_ref || 'HEAD~1' to handle both push and PR events
- Add || true to git fetch to handle cases where ref doesn't exist

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: aobolensk

.github/workflows/pre-commit.yml

@@ -23,5 +23,6 @@ jobs:
           python3 -m pip install -r requirements.txt
       - name: Run pre-commit checks
         run: |
-          git fetch origin ${{ github.base_ref }}:${{ github.base_ref }}
-          pre-commit run --from-ref ${{ github.base_ref }} --to-ref HEAD
+          FROM_REF="${{ github.base_ref || 'HEAD~1' }}"
+          git fetch origin $FROM_REF:$FROM_REF || true
+          pre-commit run --from-ref $FROM_REF --to-ref HEAD