fix(books): switch progress reset to per-file controls (#63)

* fix(books): switch progress reset to per-file controls

Remove the book-level reset action and endpoint, and keep reset scoped to each file row to avoid accidental bulk clears.

Add tests for per-file reset behavior and progress formatting edge cases while keeping migration import filters aligned with the new progress expectations.

closes #57

* ci: increase commitlint body line limit to 250

Allow longer explanatory commit bodies so CI accepts existing project commit patterns without forcing manual hard wraps at 100 characters.

commitlint.config.cjs

@@ -3,6 +3,7 @@ module.exports = {
   rules: {
     "type-enum": [2, "always", ["feat", "fix", "db", "perf", "refactor", "style", "docs", "test", "build", "ci", "chore", "security", "revert"]],
     "header-max-length": [2, "always", 100],
+    "body-max-line-length": [2, "always", 250],
     "subject-full-stop": [2, "never", "."],
     "scope-enum": [0],
     "scope-empty": [0],