refactor: migrate WIDENAMES to wideLabel capability

[severe77]

Description

This PR replaces the remaining hardcoded WIDENAMES block classification with the existing capability-based approach.

The affected blocks now declare the wideLabel capability, and consumers use Block.hasWideLabel() instead of maintaining a separate list of block names.

What changed

• Added wideLabel capability to the blocks previously listed in WIDENAMES.
• Added Block.hasWideLabel() helper.
• Replaced all WIDENAMES consumers with capability checks.
• Removed the obsolete WIDENAMES and empty EXTRAWIDENAMES lists.
• Added/updated tests for the new capability and affected block behavior.

Behavior

This is a refactoring only. The existing wide-label behavior is preserved while removing the hardcoded block-name classification.

Testing

• Prettier: passed locally
• ESLint: passed locally
• Tests: 298/298 passed locally

PR Category

• chore / refactor
• tests

[codecov]

Codecov Report

❌ Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.23%. Comparing base (67bb1bf) to head (6ce3d81).

Files with missing lines	Patch %	Lines
js/block.js	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8010      +/-   ##
==========================================
+ Coverage   62.19%   62.23%   +0.03%     
==========================================
  Files         187      187              
  Lines       58324    58331       +7     
==========================================
+ Hits        36273    36300      +27     
+ Misses      22051    22031      -20     

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[walterbender]

@Chaitu7032 look OK to you?