Release v1.5.0: Visual Conflict Resolver, HTML Export, and Stability Fixes

[phine-apps]

Summary of Changes in v1.5.0

This pull request contains the final updates and bug fixes for the v1.5.0 release:

⚔️ Visual Conflict Resolver

• Interactive 3-Way Merge: Resolve Git merge conflicts (<<<<<<<, |||||||, =======, >>>>>>>) directly in rendered Markdown.
• Scroll Position Persistence: Preserved scroll state during partial conflict resolution updates.
• CSP Compliant Event Handling: Refactored to event delegation (data-block-id, data-choice) and strict Content Security Policy.
• Modularized Parser/Renderer: Clean architecture separating webview shell, block rendering, and parsing in src/markdown/conflictParser.ts.

📄 HTML Export Enhancements

• Standalone Module: Extracted export logic to src/exportHtml.ts.
• Automatic Asset Inlining: Local images and resources converted to Base64 Data URIs.
• CDN Fallback & Safe CSP: Highlight.js, Mermaid, and KaTeX web fonts replaced with CDN links; browser-compatible CSP configured.
• Error Resilience: Graceful fallback when local assets cannot be read without crashing the export flow.

🐛 Bug Fixes & Rendering Stability

• Mermaid Compact Arrow Parser ([MERMAID-03]): Fixed regex to prevent arrow hyphens (A-->B;) from being parsed as node names.
• Code Block Newlines: Protected <pre>/<code> blocks in cleanupUnbalancedDiffTags to preserve diff tags for newlines and blank lines.
• Checkbox Restoration: Merged token restoration from both old and new documents.
• Table Alignment & Block Rediffing: Prevented structured tables from being inappropriately re-diffed as generic block elements.
• Task List UI: Fixed paragraph inline alignment for task list checkbox items.

🧪 Test Coverage & Verification

• Unit tests: 234 passing (pnpm run test:unit)
• Linter: 0 errors (pnpm run lint)
• TypeScript build: Success (pnpm run compile)
• Added comprehensive unit tests in src/test/unit/exportHtml.test.ts, src/test/unit/mermaidDiff.test.ts, and src/test/unit/markdownDiff.test.ts.