Fix: markdown table double extraction in parser

[6ba3i]

What problem does this PR solve?

Fixes markdown tables being parsed twice (once as markdown and again as generated HTML), which caused duplicate table chunks in the chunk list UI.

Type of change

• Bug Fix (non-breaking change which fixes an issue)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.52%. Comparing base (af40be6) to head (f64d214).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13892      +/-   ##
==========================================
- Coverage   98.11%   96.52%   -1.60%     
==========================================
  Files          10       10              
  Lines         690      690              
  Branches      108      108              
==========================================
- Hits          677      666      -11     
- Misses          4        8       +4     
- Partials        9       16       +7     

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