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