[Feature Request] Configurable image thumbnail size in VS Code extension

Problem

When pasting images into the Claude Code VS Code extension, the thumbnail previews are a fixed size. Depending on the image content and monitor setup, the default size may be too small to see what was pasted or too large and taking up valuable input space.

Proposed Solution

Add a configurable setting for image thumbnail size in the VS Code extension, e.g.:

"claude-code.imageThumbnailSize": "medium"  // "small" | "medium" | "large" or a pixel value

This would let users control how much space pasted image previews take up in the input/conversation area.

Alternatives Considered

• Fixed "small" thumbnails with click-to-expand — less flexible, still one-size-fits-all
• No thumbnails (current CLI behavior) — loses the visual confirmation that the right image was attached

Environment

• Claude Code Extension: 2.1.85
• VS Code: 1.112.0
• Operating System: macOS 26.3.1 (Tahoe)

I think this would be classified as "tiny" or "worthless"
<img width="805" height="189" alt="Image" src="https://github.com/user-attachments/assets/b3e9c4b8-81f6-4ee2-abff-2c5ebe44a041" />