Convert Slack conversation copy-paste text into clean Markdown format.

1. Copy conversation text from Slack
2. Paste it into the left panel
3. Get formatted Markdown on the right
4. Click "Copy" to copy the Markdown

Parses Slack's copy-paste format:

• Name [timestamp] → New speaker line
• [timestamp]message → Continuation from same speaker
• Message text → Body content

Outputs clean Markdown with **Name**: message format.