Give throwing a recording away a key of its own

Stopping a recording is the step there is no taking back. It is what sends the
audio off, and a moment later the sentence you did not mean to dictate is in
the clipboard and pasted into whatever window you were typing in. The tray menu
was the only way out, and by the time it is open the recording has already
gone. Discarding needed to be as quick as starting, which means a key.

Ctrl+Alt+Space rather than Escape: the combination the recording started with,
one modifier along, so the two are one gesture with a modifier between them.
Escape is the obvious choice and the wrong one, because it belongs to whichever
window has focus, and while you are talking something else usually has it. It
works on a dictation and on a command for the agent alike, since the one you
want to take back is the one that is running.

That made four global shortcuts, and four is the number at which three copies
of the same forty lines stop being a coincidence. The command line already had
a table of them; hotkey.py now holds it, and the settings window reads it too,
so a shortcut is a row rather than a combination box, two buttons, a status
label and three methods written out again. The window no longer takes the
commands to run as arguments either, because ipc.command_for already knows them
from the verb. Adding the fourth key is what this buys: one line in the table
and one call per row.

Both places a key can live are told about it. The listener catching the press
and the KDE shortcut arriving behind it go through the same echo guard the
toggle already had, so the two are one discard rather than two, and the tray
calls the inner method as it already did for the toggle. Ctrl+Space and
Ctrl+Alt+Space land on the same evdev key code, so there is a test for the
modifier matching that keeps them apart.

install.sh takes the second key as a second argument and refuses to register
two of the same. It hands both to `dikte shortcut install` rather than writing
kglobalshortcutsrc itself, which is what makes it work on GNOME, and what
finally puts the chosen key in the settings as well: the built-in listener
reads it from there, so a key written to only one of the two places was a key
that half worked.

Left empty in the settings window the discard key stays empty, unlike the
dictation shortcut which falls back to Ctrl+Space: a recording can always be
thrown away from the tray menu, so there is nothing to guarantee here.

README.md

@@ -25,7 +25,7 @@ just the Python standard library and PyQt6.
 sudo pacman -S --needed pipewire-audio wl-clipboard ydotool ffmpeg python-pyqt6
 systemctl --user enable --now ydotool     # needed for auto-paste
 
-./install.sh                 # or:  ./install.sh "Ctrl+Alt+Space"
+./install.sh                 # or:  ./install.sh "Meta+Space" "Meta+Shift+Space"
 dikte                        # the settings window opens on first run
 ```
 
@@ -36,8 +36,8 @@ tools instead:
 sudo apt install pulseaudio-utils xclip xdotool ffmpeg
 ```
 
-`install.sh` adds the `dikte` command, a menu entry and an autostart entry. The
-settings window installs a GNOME or KDE global shortcut.
+`install.sh` adds the `dikte` command, a menu entry, an autostart entry and the
+two global shortcuts, whose keys are its two arguments.
 
 Three keys go in the settings window: **OpenAI**, **Groq** and **OpenRouter**.
 Speech to text runs on any of them (`gpt-4o-transcribe` by default), cleanup
@@ -53,7 +53,7 @@ set next to it.
 | What | How |
 | --- | --- |
 | Start / stop recording | `Ctrl+Space`, or click the tray icon |
-| Cancel a recording | Tray menu → *Cancel recording*, or `dikte cancel` |
+| Discard the recording | `Ctrl+Alt+Space`, tray menu, or `dikte cancel` |
 | Speak a command to an agent | Tray menu → *Ask Claude*, or `dikte ask` |
 | Start / end a meeting | Tray menu → *Record a meeting*, or `dikte meeting` |
 | Settings | Tray menu → *Settings*, or `dikte settings` |
@@ -127,11 +127,11 @@ running.
   right-click to delete.
 - **Turkish and English interface**, following the system locale by default.
 
-## The global shortcut needs one logout
+## The global shortcuts need one logout
 
-KWin only reads `kglobalshortcutsrc` at startup, so the shortcut `install.sh`
+KWin only reads `kglobalshortcutsrc` at startup, so the shortcuts `install.sh`
 writes will not fire until you log out and back in. Until then, Settings →
-Shortcut → **built-in listener** reads `/dev/input` and catches the combination
+Shortcuts → **built-in listener** reads `/dev/input` and catches the combination
 itself. The difference: it does not swallow the key, so `Ctrl+Space` also reaches
 the focused application (some editors will pop up autocomplete). The listener
 needs your user in the `input` group: `sudo usermod -aG input $USER`.