fix(block-editor): render subscript and superscript marks as <sub>/<sup> in Story Block HTML output

[dsolistorres]

Summary

• Adds subscript and superscript mark handling to the renderMarks macro in dotCMS/src/main/webapp/WEB-INF/velocity/VM_global_library.vm — previously these marks were silently dropped during Story Block HTML rendering even though the Block Editor (TipTap) registers both extensions.
• Branches are added to both the opening loop and the closing reverse-range loop so nested combinations (e.g. bold + superscript) close in the correct order.
• Adds integration coverage in StoryBlockMapTest (test_subscript_and_superscript_marks_render_to_html) covering each mark individually plus a combined nesting case (<strong><sup>bold-sup</sup></strong>).

Closes #35460

Before / After

Input JSON:

{ "type": "text", "marks": [{ "type": "superscript" }], "text": "2" }

	Output
Before	2
After	<sup>2</sup>

Test plan

• ./mvnw verify -pl :dotcms-integration -Dcoreit.test.skip=false -Dit.test=StoryBlockMapTest passes (new test + existing tests).
• Manual: create a contentlet with a Block Editor field, apply Subscript and Superscript via the toolbar, save/publish, render via $contentlet.myField.toHtml in a VTL/page, confirm <sub> / <sup> wrap the affected text.
• Manual regression: confirm bold, italic, strike, underline, and link still render as before.

🤖 Generated with Claude Code

[claude]

Claude finished @dsolistorres's task in 1m 32s —— View job

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dotCMS Backend Review

• Gather context and load conventions
• Get Java diff
• Run security, database, Java standards, and REST API sub-reviews in parallel
• Consolidate and post findings

All four sub-reviews (security, database, Java standards, REST API) returned no issues.

✅ dotCMS Backend Review: no issues found.

[claude]

✅ dotCMS Backend Review: no issues found.