feat: add Typer CLI with daemon mode and wtype keyboard injection

Replace argparse CLI with Typer-based CLI supporting `cohere on/off/status`
commands. The daemon runs transcription in the background and types into the
focused Wayland window via wtype. Adds wtype to flake.nix and fixes the
hatchling build backend.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pyproject.toml

@@ -14,14 +14,16 @@ dependencies = [
     "soundfile>=0.13.1",
     "torch>=2.12.0",
     "transformers>=5.9.0",
+    "typer[all]>=0.15.0",
 ]
 
 [project.scripts]
+cohere = "cohere_transcribe.cli:main"
 cohere-transcribe = "cohere_transcribe.cli:main"
 
 [build-system]
 requires = ["hatchling"]
-build-backend = "hatchling.backends"
+build-backend = "hatchling.build"
 
 [tool.hatch.build.targets.wheel]
 packages = ["src/cohere_transcribe"]