[3.x] Add header-style code block labels

[emmadesilva]

Summary

• Render titled Markdown code blocks with a responsive header by default.
• Keep the HydePHP v2 top-right badge presentation available through markdown.code_block_label_style => 'badge'.
• Give long filenames and titles normal layout space on narrow screens while leaving untitled and terminal blocks unchanged.

Upgrade note

Projects that want to retain the v2 appearance can set 'code_block_label_style' => 'badge' in config/markdown.php.

Validation

• Focused code block, Blade block, view-model, rendered-partial, and documentation tests pass.
• FeatureFramework: 1,881 passed; the sandbox-only socket-bind failure passes with host permissions.
• UnitFramework: 1,921 passed; only the documented pre-existing PHP 8.5 FeaturedImageUnitTest failure remains.
• FeatureHyde: 6 passed.
• php monorepo/HydeStan/run.php: no errors.

Preview

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (29531b4) to head (9922cdf).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master     #2583   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity      1807      1810    +3     
===========================================
  Files            183       183           
  Lines           4474      4483    +9     
===========================================
+ Hits            4474      4483    +9     

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