GH#4 Support additional IDE chat transcript formats (Cursor/Windsurf/Augment) (vibe-kanban 7894c989)

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Issue: #4
Context:
- Track progress for #1/#2/#3

Acceptance criteria:
- [ ] Parsing works for real exports
- [ ] Tests/fixtures added
- [ ] HTML output renders correctly

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Author: abgyja

README.md

@@ -29,6 +29,7 @@ This tool converts Claude Code and Codex CLI session files into browseable multi
 **Supported formats:**
 - Claude Code session files (JSONL format from `~/.claude/projects`)
 - Codex CLI session files (JSONL format from `~/.codex/sessions`) - automatically detected and converted
+- VS Code-based IDE chat exports (Cursor/Windsurf/Augment) in JSON ("Chat: Export Chat") and Markdown/text formats
 
 There are four commands available: