Optional Icon Block integration (dual source, preset grid preserved)

[jrevillini]

Summary

Adds an optional The Icon Block bridge for core/button:

• Toolbar bolt reuses Icon Block inserter/modals (@icon-block at build time).
• Sidebar keeps the original preset grid; adds a compact ICON SOURCE section (Built-in Library vs The Icon Block + Reset).
• Dual storage: preset slug and library SVG can coexist; iconSource selects display.
• Front end renders saved ebiIcon when Icon Block is not active.

Relates to #2 — happy to collaborate or supersede that branch if this direction fits better.

Why this vs #2

	#2 (existing)	This PR
Preset grid when Icon Block active	Replaced / hidden	Always visible
Source switching	Toolbar-centric	iconSource + sidebar Reset
Back-compat	—	Explicit preset + library retention

Documentation

• Architecture / traceability: docs/ARCHITECTURE.md
• Manual tests: docs/ICON_SOURCE_TEST_CHECKLIST.md
• Build: clone icon-block sibling, npm install && npm run build (see README)

Demo

• Video: https://drive.google.com/file/d/1q6EykDbloZlbnbnRDCC5i6oZT-sK1aQD/view?usp=sharing
• Live demo site: available upon request.

Test plan

• Preset pick → bolt library icon → Reset → preset highlighted + canvas match
• Placement toggles work for preset and library
• Deactivate Icon Block: front still shows ebiIcon; editor warning; presets work
• Legacy posts with only icon slug unchanged
• npm run build clean with Icon Block clone at ../icon-block

Diff notes

20 file pairs differ (see manifest.txt)

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Branch: feature/icon-block-integration · Generated 2026-05-23T11:54:53Z

[jrevillini]

Discussion started in #4 — relates to #2. @ndiego when you have a moment, demo video is in the PR description; live demo site available on request. Happy to adjust based on your preferred direction.