- Remove Renderer.scale field and SetScale method
- Add ScaleProvider interface to avoid editor/ui import cycle
- Add Scale() method to State, rename Scale field to scale
- Renderer reads scale through r.scale.Scale()
- Fix icons.go blank import preventing embed.FS usage
- Update main.go to pass State as ScaleProvider to Renderer
- New shaper.go: ShapeText() returns ShapedText with measured width +
stored PathSpec + BitmapsCall, DrawShapedText() draws with zero shaper calls
- drawStatusBar: ShapeText for filename + right icons, positions from widths
- drawBottomBar: ShapeText for cursor/bytepos/wrap, positions by alignment
- No separate measureText helper: ShapeText.Width provides measurements
- StatusBar uses IconLeft/IconRow string slices for icon configuration
- BottomBar uses BarAlignment enum for item positioning
