hypr: add hold-to-talk voice dictation via whisrs

Bind the Copilot key (SUPER+SHIFT+F23) to whisrs on press and release,
so holding it records and letting go transcribes. Injection uses wtype,
which works natively on Hyprland and reaches any focused window,
including TUIs running in the dockerized agent containers.

Decoding runs on the iGPU through the Vulkan feature of a locally
rebuilt whisrs-git: the stock AUR build is CPU-only and compiled with
generic -march, which made dictation take around five seconds. Requires
whisrs-git (AUR), wtype and pipewire-alsa; documented in the README
along with the config and model locations.

README.md

@@ -106,10 +106,25 @@ You also need to install all the dependencies:
   portal startup script falls back to launching the portals manually.)
 - fcitx5
 - fcitx5-hangul
+- wtype (types the transcribed text)
+- whisrs-git (AUR; voice dictation daemon, see below)
 
 There are probably more, I will update the list next time I'm
 installing it on a new computer.
 
+Voice dictation
+===============
+
+The Copilot key (on newer laptops this replaced the right Ctrl key; it
+sends SUPER+SHIFT+F23) toggles voice dictation. Press it once to start
+recording and again to stop. whisrs transcribes locally with a
+whisper.cpp model and types the text at the cursor via wtype, in any
+window, including terminals running the dockerized agent harnesses.
+
+The config lives in ~/.config/whisrs/config.toml and the model in
+~/.local/share/whisrs/models/. The daemon runs as the systemd user
+service whisrs.service.
+
 License
 =======