🐛 Internal Error When Reading PNG Files via read_file Tool in Cascade

[Empeko]

Description

Cascade throws an internal error when attempting to read .png files using the read_file tool or citation format.

Steps to Reproduce

1. Have a .png file in workspace (e.g., Unity sprite asset)
2. Use citation format like @path/to/file.png:1 or call read_file tool
3. Error occurs immediately

Actual Behavior

Invalid argument: an internal error occurred (error ID: e627f23aa1d5490fb70889e9d2e059ee) and crashed cascade

Expected Behavior

• PNG files should be viewable like JPG/GIF formats
• OR: Clear error message stating PNG is not supported

Environment

• OS: Windows 11
• Windsurf Version: Latest stable
• Tool: read_file
• File Type: .png
• Context: Unity game development project

Impact

• Severity: Medium-High
• PNG is the standard format for game development (Unity assets: sprites, textures, UI)
• Users cannot preview their game assets without manual conversion
• Workaround exists but is cumbersome and breaks workflow

Current Workaround

Convert PNG → JPG temporarily via PowerShell:

Add-Type -AssemblyName System.Drawing
$img = [System.Drawing.Image]::FromFile("file.png")
$img.Save("temp.jpg", [System.Drawing.Imaging.ImageFormat]::Jpeg)
$img.Dispose()
# Read JPG, then delete temp file

Additional Context
Working formats: .jpg, .gif
Also broken: .bmp (file too large error), .tif (null bytes error)
This significantly impacts game developers using Unity/Unreal/Godot where PNG is the primary asset format
Suggested Fix
Either:

Add PNG support to read_file tool (preferred)
Return user-friendly error message: "PNG format not supported. Please use JPG or GIF."