[FEATURE] Add claudeCode.fontSize setting for VS Code extension panels

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Currently, the only way to increase text size in the Claude Code VS Code extension panels is to increase the overall VS Code zoom level (window.zoomLevel), which affects the entire editor. I'd like to increase the font size in the Claude Code UI without zooming everything else.

Proposed Solution

Add a claudeCode.fontSize VS Code setting (numeric, e.g. "claudeCode.fontSize": 14) that controls the font size within the Claude Code extension panels independently of window.zoomLevel. This should apply to both:

1. The Claude Code chat window (the primary panel where conversations happen)
2. The chat history sidebar (the pop-out that lists previous chats)

Alternative Solutions

The current workaround is increasing window.zoomLevel, but this zooms the entire VS Code UI including the editor, terminal, and all other panels.

Priority

Medium - Would be very helpful

Feature Category

Configuration and settings

Use Case Example

<img width="2218" height="264" alt="Image" src="https://github.com/user-attachments/assets/c92697eb-6ffd-439e-92e7-b5cd21caf82d" />

The left tab is Claude Code. The right tab is a text scratch file. As you can see, the font sizes are different. I prefer the font size on the right, but if I were to zoom in to make the Claude Code font match it, the right-hand side's text would grow bigger than I would want. Also, there would be less space in the UI because zooming in reduces the amount of content that can fit in each panel.

Additional Context

It could be argued that this is a bug instead of a feature request. The bug is that Claude Code doesn't respect the VS Code editor's font settings.

<img width="1134" height="984" alt="Image" src="https://github.com/user-attachments/assets/ac8e1f1d-3009-42c0-8033-df30a038e35f" />

VS Code:
Version: 1.120.0 (user setup)
Commit: 0958016b2af9f09bb4257e0df4a95e2f90590f9f
Date: 2026-05-12T20:17:22Z
Electron: 39.8.8
ElectronBuildId: 13870025
Chromium: 142.0.7444.265
Node.js: 22.22.1
V8: 14.2.231.22-electron.0