docs: Add comprehensive Alpine.js integration completion guide
Created a detailed 1,354-line migration guide to complete the Alpine.js integration from the current hybrid state (manual DOM manipulation) to full reactive Alpine.js. Document contents: - Current state analysis (121 manual DOM manipulations identified) - Complete migration strategy with 4-step pattern - Phase-by-phase implementation guide (header.templ reference + 7 modals) - Before/after code examples with line numbers - Alpine.store pattern for global modal state - Verification checklists and testing procedures - Troubleshooting guide for common issues - Success criteria and metrics Key benefits documented: - Eliminates 121 instances of manual DOM manipulation - Reduces header.ts from 100 to 40 lines (60% reduction) - Adds smooth transitions with x-transition - Implements click-outside detection with @click.outside - Provides clean, maintainable architecture This guide completes the ESBUILD_MIGRATION_PLAN.md Phase 3 (Template Migration) with actionable steps for any developer to finish the integration in 10-12 hours. Related: ESBUILD_MIGRATION_PLAN.md Phase 3, lines 998-1242
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