Code note: default size too small — opens as tiny square

[kordless]

Problem

When a code sticky note is opened without explicit width/height parameters, it renders as a very small square — too small to read any code.

Proposed solution

• Increase the default dimensions. Suggested: 900 × 650px (current default is 800 × 600 per the API but appears to render much smaller)
• Investigate whether the default is being applied correctly or if there's a CSS/layout issue causing the note to collapse
• Minimum enforced size should be large enough to show ~10 lines of code without scrolling

Steps to reproduce

Call sticky_note_create_code with no width or height arguments — note opens as a small square.