Release v15.1.1

Five new quick fixes for stylistic rules: convert regular comments to doc comments, remove redundant type annotations, replace string + concatenation with adjacent literals, simplify BorderRadius.all(Radius.circular(r)) to BorderRadius.circular(r), and replace sizing-only Container with SizedBox. log

Added

• Quick fix for prefer_doc_comments_over_regular: converts // comments to /// doc comments with one click. No action required.
• Quick fix for avoid_explicit_type_declaration: removes the redundant type annotation, letting the compiler infer the type. No action required.
• Quick fix for prefer_adjacent_strings: strips + operators between string literals, producing idiomatic adjacent-string syntax. No action required.
• Quick fix for prefer_borderradius_circular: rewrites BorderRadius.all(Radius.circular(r)) to the shorter BorderRadius.circular(r). No action required.
• Quick fix for prefer_sizedbox_over_container: replaces sizing-only Container with SizedBox. No action required.

Maintenance

• Publish script now strips - Unreleased suffix (and typo variants) from versioned CHANGELOG headings at publish time, so ## [X.Y.Z] - Unreleased is cleaned to ## [X.Y.Z] before version sync.

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