Support pasting images from all clipboard sources (not just direct screenshots)

Feature Request

Currently, pasting images with Ctrl+V in Claude Code CLI only works reliably for direct screenshots. Images copied from other sources (Finder, browsers, other apps) don't paste - you get "No image found in clipboard" or nothing happens.

Current Behavior

• ✅ Direct screenshots (Cmd+Shift+4, etc.) → Ctrl+V works
• ❌ Copy image from Finder → Ctrl+V doesn't work
• ❌ Copy image from browser → Ctrl+V doesn't work
• ❌ Copy image from Preview/other apps → Ctrl+V doesn't work

Expected Behavior

Ctrl+V should paste images regardless of how they were copied to the clipboard.

Environment

• macOS (Terminal.app)
• Claude Code CLI

Workarounds

Currently using drag-and-drop or saving to file first, but native clipboard support would be much smoother.

Additional Context

The clipboard contains the image data in these cases (verified with other apps that can paste it), so it seems like Claude Code is only looking for a specific clipboard format that screenshots provide.