Replaced minifb with winit + softbuffer:
Input (layout-agnostic):
- winit uses PhysicalKey<KeyCode> which maps to physical key positions
- KeyCode::KeyA = physical A key, regardless of keyboard layout
- Works on Russian, Arabic, any layout — no key mapping needed
- HashSet<KeyCode> tracks pressed/released state
- Proper Press/Release events from OS, no timeout hacks
FPS improvements:
- Glyph atlas pre-built at startup (alpha bitmap, zero per-frame alloc)
- render_to_buffer: skip empty cells entirely (no draw call)
- blend_fast: bitshift instead of division for alpha blending
- Buffer fill via .fill() instead of nested loop
- copy_from_slice for pixel transfer to softbuffer (memcpy speed)
- ControlFlow::Poll for maximum frame rate
109 tests, 0 failures
New --mode window (now default):
- minifb creates a real OS window (no terminal needed)
- fontdue rasterizes DejaVu Sans Mono glyphs to pixel buffer
- ASCII characters rendered as colored pixels — same aesthetic
- Keyboard polled via get_pressed_keys() every frame:
- Instant response, no terminal delay
- Proper multi-key support (W+A strafing works)
- No Release event hacks needed
- No key repeat timeout hacks
- Instant stop when key released
Controls: WASD/arrows, 1-9/0 paint, X erase, HJKL camera, Q/Esc quit
--mode terminal still available as fallback
109 tests, 0 warnings, 0 failures
Emil