v0.9.1

Fixed

• 3MF Export: Non-Manifold Mesh — exported meshes now weld shared vertices, eliminating "non-manifold" warnings in slicers like Bambu Studio.
• 3MF Export: Inverted Normals — fixed triangle winding order (CW→CCW) in STL, OBJ, and 3MF exports; resolves Bambu Studio's "too small, may be in meters" false positive caused by negative signed volume.
• 3MF Export: Multiple Objects Warning — restructured 3MF output to use a single assembly object with component references instead of separate build items, preventing "multiple objects at different heights" warnings.
• 3MF Export: Missing Material Namespace — added required xmlns:m namespace declaration when color groups are present, fixing invalid XML in exported files.
• Windows Paste — fixed pasting full text (e.g. API tokens) on Windows; previously only the first character appeared due to per-character event filtering.
• Windows CPU Usage — switched to reactive rendering mode (WinitSettings::desktop_app()) so the app only redraws on user input or async events, dramatically reducing idle CPU usage.

Improved

• Chat Panel Scrolling — chat responses now scroll horizontally (like the code editor) so wide content no longer hides the compile button and other controls.
• Chat Input Scrolling — chat input area now scrolls vertically with a max height, preventing the input from expanding unboundedly with large text.