docs: add issue regression demos and coverage matrix

[chenshuai2144]

Summary

• add runnable regression galleries for field, form, layout, list, and table fixes merged in fix(select): preserve object search callback pipeline #9711–feat(table): support drag sorting editable rows #9732
• expose the galleries from the Chinese and English component documentation
• add an issue-to-test-to-demo coverage matrix, including executable documentation and benchmark cases

Verification

• pnpm test — 186 files, 1,554 tests passed
• pnpm run tsc
• focused ESLint for all five new demos
• pnpm run docs:check
• Dumi Webpack build — passed; the default UtooPack path still hits the repository's known Windows Invalid count value: -22 failure
• node scripts/benchmarks/tableEditableLookup.mjs — Set.has 4.61x faster than Array.some in this run
• git diff --check

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⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 69a56c19-2aa8-4895-851c-61f82e4dcdb6

📥 Commits

Reviewing files that changed from the base of the PR and between c4d719f and c221e3f.

📒 Files selected for processing (16)

• demos/field/issue-regression-gallery.tsx
• demos/form/issue-regression-gallery.tsx
• demos/layout/issue-regression-gallery.tsx
• demos/list/issue-regression-gallery.tsx
• demos/table/issue-regression-gallery.tsx
• docs/issue-regression-test-demo-matrix-2026-10-03.md
• site/components/field.en-US.md
• site/components/field.md
• site/components/form.en-US.md
• site/components/form.md
• site/components/layout.en-US.md
• site/components/layout.md
• site/components/list.en-US.md
• site/components/list.md
• site/components/table.en-US.md
• site/components/table.md

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (master@c4d719f). Learn more about missing BASE report.
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #9733   +/-   ##
=========================================
  Coverage          ?   88.60%           
=========================================
  Files             ?      421           
  Lines             ?    12800           
  Branches          ?     4766           
=========================================
  Hits              ?    11341           
  Misses            ?     1304           
  Partials          ?      155           

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