Track AutoAPI anchors in page TOC

[timkpaine]

Description

Keep non-heading fragment targets in the TOC scroll spy so AutoAPI signatures remain observable. This lets object entries such as THEME_DIR, THEME_NAME, and setup() participate in viewport highlighting and fills the complete TOC rail at the bottom of the module page.

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor / code cleanup
• CI / build configuration
• Other (describe below)

Checklist

• Linting passes (make lint)
• Tests pass (make test)
• New tests added for new functionality
• Documentation updated (not applicable)
• Changelog / version bump (not applicable)

[github-actions]

Test Results

44 tests  ±0   44 ✅ ±0   2s ⏱️ ±0s
 1 suites ±0    0 💤 ±0 
 1 files   ±0    0 ❌ ±0 

Results for commit 7b82400. ± Comparison against base commit 93d7be1.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.99%. Comparing base (93d7be1) to head (7b82400).

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
+ Coverage   91.97%   91.99%   +0.01%     
==========================================
  Files           6        6              
  Lines         461      462       +1     
  Branches       61       61              
==========================================
+ Hits          424      425       +1     
  Misses         16       16              
  Partials       21       21              

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