chore(hooks): add editorconfig-checker and fix lines exceeding 80 chars

Add editorconfig-checker pre-commit hook to catch line-length
violations locally. Shorten docstrings in aeonview.py and
aeonview_test.py that exceeded the 80-character editorconfig limit.
Remove double-quote-string-fixer hook that conflicted with ruff-format.

.pre-commit-config.yaml

@@ -30,6 +30,12 @@ repos:
       - id: name-tests-test
       - id: no-commit-to-branch
       - id: trailing-whitespace
+  - repo: https://github.com/editorconfig-checker/editorconfig-checker.python
+    rev: "3.6.1"
+    hooks:
+      - id: editorconfig-checker
+        alias: ec
+        exclude: uv\.lock
   - repo: local
     hooks:
       - id: pyright

aeonview.py

@@ -317,11 +317,12 @@ class AeonViewVideos:
     def _concatenate_videos(
         self, label: str, input_videos: list[Path], output_file: Path
     ) -> None:
-        """Concatenate multiple video files into one using ffmpeg concat demuxer.
+        """Concatenate video files into one using ffmpeg concat.
 
-        :param label: Human-readable label for log messages (e.g. "monthly video for 2025-04").
-        :param input_videos: List of input video file paths to concatenate.
-        :param output_file: Path for the resulting concatenated video.
+        :param label: Human-readable label for log messages
+            (e.g. "monthly video for 2025-04").
+        :param input_videos: Paths of input videos to concatenate.
+        :param output_file: Path for the resulting video.
         """
         logging.info("Generating %s", label)
         logging.info("Output file will be %s", output_file)
@@ -350,7 +351,7 @@ class AeonViewVideos:
 
 
 class AeonViewHelpers:
-    """Utility methods for path manipulation, argument parsing, and ffmpeg commands."""
+    """Utility methods for paths, argument parsing, and ffmpeg."""
 
     @staticmethod
     def check_date(year: int, month: int, day: int) -> bool:
@@ -501,7 +502,7 @@ class AeonViewHelpers:
 
         :param input_files: List of input video file paths.
         :param output_file: Path to the output video file.
-        :return: Tuple of (ffmpeg command list, temporary concat list file path).
+        :return: Tuple of (command list, temp concat file path).
         """
         concat_list = tempfile.NamedTemporaryFile(
             mode="w", suffix=".txt", delete=False

aeonview_test.py

@@ -47,13 +47,13 @@ def make_video_args(
 
 @contextlib.contextmanager
 def expect_error_exit():
-    """Context manager that expects ``SystemExit`` and silences ``logging.error``."""
+    """Expect ``SystemExit`` and silence ``logging.error``."""
     with pytest.raises(SystemExit), mock.patch("aeonview.logging.error"):
         yield
 
 
 def make_app_with_project(tmp: str) -> tuple[AeonViewApp, Path]:
-    """Create an ``AeonViewApp`` whose base_path points at *tmp* with a 'proj' dir."""
+    """Create an ``AeonViewApp`` with base_path at *tmp*/'proj'."""
     app = AeonViewApp()
     app.base_path = Path(tmp).resolve()
     proj_path = app.base_path / "proj"
@@ -456,7 +456,7 @@ def test_generate_monthly_video(mock_subprocess_run):
 
 @mock.patch("subprocess.run")
 def test_generate_monthly_video_excludes_output_file(mock_subprocess_run):
-    """Verify that the monthly output file is excluded from the input list on re-runs."""
+    """Verify monthly output file is excluded from inputs on re-runs."""
     captured_content = {}
 
     def capture_concat(cmd, **_kwargs):