fix: resolve 8 bugs + bump version to 1.2.2

[vietnguyentuan2019]

Summary

• Android build fix (Android build fails with modern compileSdk #5): irondash_engine_context 0.5.5 (compileSdk=31) conflicts with androidx.fragment:1.7.1 (minCompileSdk=34) — added subprojects { compileSdk = 35 } override in example/android/build.gradle.kts
• SVG invisible with sanitize: true: Added atomic SVG sanitization that preserves structure while stripping <script> and dangerous attributes
• HyperRenderConfig identity-compare bug: Added operator== / hashCode — prevents unnecessary re-layouts when _effectiveConfig creates new object for @keyframes docs
• selectable toggle ignored: didUpdateWidget now creates/disposes VirtualizedSelectionController correctly
• Deep-link taps silently blocked: _safeOnLinkTap now consults both allowedCustomSchemes and renderConfig.extraLinkSchemes
• CSS change bypassed section cache: _sectionHashes reset in didUpdateWidget when customCss changes
• Markdown/Delta virtualized as single section: Added _splitIntoSections() — large Markdown/Delta docs now chunk properly in virtualized/paged mode
• renderConfig partial change detection: didUpdateWidget uses full value equality instead of only virtualizationChunkSize
• CSS float class names not detected: _containsFloatChild now recognises Bootstrap/Tailwind patterns (float-left, pull-right, alignleft, etc.)

Test plan

• dart analyze --fatal-infos — no issues
• dart format — no diff
• 809 tests passed locally (flutter test --no-pub)
• CI green on PR

[github-actions]

✅ Layout Regression — All fixtures within 60 FPS budget

	Fixture	Budget (ms)	Median (ms)	P95 (ms)
❌	simple_paragraph	8	16	17
❌	mixed_inline	10	15	16
❌	float_layout	12	17	25
❌	table_20_rows	14	36	44
✅	cjk_ruby	14	11	12
❌	large_article	16	44	49

One or more fixtures exceeded the 16 ms budget.

Flutter 3.41.5 · ubuntu-22.04

No action required.

[github-actions]

✅ Layout Regression — All fixtures within 60 FPS budget

	Fixture	Budget (ms)	Median (ms)	P95 (ms)
❌	simple_paragraph	8	18	21
❌	mixed_inline	10	15	16
❌	float_layout	12	19	28
❌	table_20_rows	14	46	56
✅	cjk_ruby	14	12	15
❌	large_article	16	50	55

One or more fixtures exceeded the 16 ms budget.

Flutter 3.41.5 · ubuntu-22.04

No action required.

[github-actions]

❌ Visual Regression Detected

23 golden test(s) failed on Flutter 3.41.5 / ubuntu-22.04.

The rendered output no longer matches the reference images.

If the change is intentional, regenerate the goldens on the
same platform via the Update Goldens workflow dispatch, or run
locally in Docker:

docker run --rm \
  -v $(pwd):/workspace -w /workspace \
  ghcr.io/cirruslabs/flutter:3.41.5 \
  bash -c "apt-get update -qq && \
    apt-get install -y fonts-noto fonts-noto-cjk fonts-roboto && \
    flutter pub get && \
    flutter test test/golden/ --update-goldens"
git add test/golden/goldens/
git commit -m "chore: update golden references (Flutter 3.41.5)"

⚠️ Always regenerate goldens on ubuntu-22.04 with Flutter
3.41.5 to keep references pixel-stable across machines.

[github-actions]

✅ Layout Regression — All fixtures within 60 FPS budget

	Fixture	Budget (ms)	Median (ms)	P95 (ms)
❌	simple_paragraph	8	18	21
❌	mixed_inline	10	16	20
❌	float_layout	12	19	28
❌	table_20_rows	14	42	50
✅	cjk_ruby	14	10	12
❌	large_article	16	51	55

One or more fixtures exceeded the 16 ms budget.

Flutter 3.41.5 · ubuntu-22.04

No action required.

[github-actions]

✅ Layout Regression — All fixtures within 60 FPS budget

	Fixture	Budget (ms)	Median (ms)	P95 (ms)
❌	simple_paragraph	8	17	20
❌	mixed_inline	10	18	20
❌	float_layout	12	19	31
❌	table_20_rows	14	42	56
✅	cjk_ruby	14	11	12
❌	large_article	16	50	55

One or more fixtures exceeded the 16 ms budget.

Flutter 3.41.5 · ubuntu-22.04

No action required.