[Bug] Alt+V image paste has 5-second delay on Windows

Bug Description
Title:
[BUG] Alt+V image paste takes ~5 seconds while drag & drop is instant (Windows)

Description:
## Environment

• Claude Code: v2.0.76 (native install via install.ps1)
• OS: Windows 11
• Terminals: Windows Terminal, Warp (same issue in both)

## Problem
Pasting images from clipboard using Alt+V takes approximately 5 seconds, while drag & drop of the same image file is instant.

## Steps to reproduce

1. Take a screenshot (Win+Shift+S) or copy any small image
2. In Claude Code, press Alt+V to paste
3. Wait ~5 seconds for image to appear

## Expected behavior
Image paste should be nearly instant (like drag & drop)

## Actual behavior

• Alt+V paste: ~5 seconds delay
• Drag & drop: instant
• Text paste: works normally (no delay)

## Test image

• Size: 37.5 KB
• Dimensions: small screenshot

## Notes
This suggests the clipboard read mechanism for images on Windows is inefficient - possibly spawning a PowerShell process for each paste operation.

Environment Info

• Platform: win32
• Terminal: null
• Version: 2.0.76
• Feedback ID: 6ea435d4-2dc3-4173-934e-5ffcb56625e6

Errors

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