Lefty v1.3.0

New in v1.3.0:

• Engine hotkey fix: after a manual Activate the engine could end up with zero
  instances running (singleton self-kill via taskkill plus a zombie parent-watcher
  missing WM_QUIT). start_engine now reaps orphans and respawns a dead child,
  so F6 toggle always works
• Settings redesigned with a sidebar: General, Appearance, Input, Profiles, About
• Accent Color: 10 presets plus a custom color picker — the whole M3 theme
  regenerates from the seed color
• Add Mapping validation: duplicate source keys and self-maps are blocked inline
  with clear error messages
• Profile Import/Export to .json with merge or replace modes
• Interface sounds: synthesized activate/pause chimes,
  toggleable in Settings → General

Hotfixes and polish in this update:

• Floating pill header with a segmented Paused/Active switch (keyboard accessible)
• Bigger mappings list and a redesigned Add-mapping dialog with keycaps
• Instant toggle: optimistic UI, 100 ms status poll, no artificial delays
• Launch at startup now actually works (Task Scheduler with Interactive
  logon token and Highest run level, no UAC prompt, no password needed)
• New launch options: Start minimized to tray, Start with mappings active
• Mouse-click baseline read from the OS registry: inverted clicks can no longer
  get stuck after double-instance replace or kills
• Elevation happens before the single-instance check, so replacing a running
  elevated instance actually closes it instead of duplicating it
• No more console flashes: helper subprocesses run hidden
• Deterministic startup: single-launch guard plus orphan reap that waits for
  the engine mutex to free
• Engine latency pack: batched SendInput, 1 ms timer resolution, no power
  throttling, plus a live per-second latency readout in Settings → About
  so you can verify the speed yourself

Install with Lefty_1.3.0_x64-setup.exe or Lefty_1.3.0_x64_en-US.msi below.
Run as Administrator for games that run elevated.