good first issue: copy button on rule condition and action text

[hvardhan878]

Problem

In the Behaviour tab, each rule card shows a WHEN ... condition and a DO ... action. There's no way to copy this text without manually selecting it, which is frustrating when you want to share a rule or paste it into a bug report.

What to build

A small clipboard icon (📋 or SVG icon) that appears on hover next to the WHEN and DO text. Clicking it copies the text to the clipboard and briefly shows a ✓ checkmark.

Acceptance criteria

• Copy icon appears on hover of the rule condition and action rows
• Clicking copies the text and shows a transient ✓ for ~1.5 s
• Works without any new npm dependencies (use navigator.clipboard.writeText)
• Matches existing dark card style

Files to look at

• src/renderer/index.html — search for rule-when and rule-do CSS classes and the loadModel() function that renders rule cards
• No backend changes needed