v0.2.1: Fix cancel key (Escape) being swallowed globally

The cancel key was consumed by rdev::grab at all times, not just during
recording/transcribing. This made the Escape key unusable system-wide
while Mouth was running. Now the cancel key only gets swallowed when
Mouth is actively recording or transcribing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mouth"
-version = "0.2.0"
+version = "0.2.1"
 edition = "2024"
 description = "Offline speech-to-text with global hotkey and paste"
 license-file = "LICENSE"