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.

tests/test_ui.py

@@ -12,6 +12,7 @@ from unittest import mock
 from PyQt6.QtWidgets import QApplication, QMessageBox
 
 import config as cfg
+import hotkey
 import overlay as overlay_module
 import settings_ui
 from tests.support import DikteTest, only_these_tools
@@ -76,6 +77,7 @@ CHANGED = {
     "file_timestamps": True,
     "file_cleanup": False,
     "shortcut": "Ctrl+Alt+Space",
+    "cancel_shortcut": "Meta+Shift+Space",
     "evdev_hotkey": True,
     "history_limit": 50,
 }
@@ -98,7 +100,7 @@ class Settings(DikteTest):
                                             self.path("kglobalshortcutsrc")))
 
     def window(self, conf):
-        window = settings_ui.SettingsWindow(conf, "dikte toggle")
+        window = settings_ui.SettingsWindow(conf)
         self.addCleanup(window.deleteLater)
         self.addCleanup(window.close)
         return window
@@ -136,6 +138,37 @@ class Settings(DikteTest):
         self.assertEqual(stored["speech_margin_db"], 15.0)
         self.assertEqual(stored["openrouter_base_url"], "http://localhost:1234/v1")
 
+    def test_every_global_shortcut_has_a_row_of_its_own(self):
+        window = self.window(cfg.Config())
+        self.assertEqual(set(window._shortcut_rows), set(hotkey.SHORTCUTS))
+
+    def test_emptying_a_shortcut_turns_it_off_but_not_the_toggle(self):
+        """The application is unusable without the toggle, so that one box
+        falls back. The rest stay empty, which is how they are switched off."""
+        conf = cfg.Config()
+        window = self.window(conf)
+        for box, _status, _missing in window._shortcut_rows.values():
+            box.setCurrentText("")
+        window._save()
+        self.assertEqual(conf["shortcut"], "Ctrl+Space")
+        self.assertEqual(conf["cancel_shortcut"], "")
+        self.assertEqual(conf["assistant_shortcut"], "")
+        self.assertEqual(conf["meeting_shortcut"], "")
+
+    def test_installing_the_discard_key_writes_its_own_entry(self):
+        conf = cfg.Config()
+        window = self.window(conf)
+        window._shortcut_rows["cancel"][0].setCurrentText("Meta+Shift+Space")
+        with mock.patch.object(settings_ui.hotkey, "install_shortcut",
+                               return_value=(True, "saved")) as install:
+            window._install_shortcut("cancel")
+        combo, command = install.call_args.args
+        self.assertEqual(combo, "Meta+Shift+Space")
+        self.assertTrue(command.endswith(" cancel"))
+        self.assertEqual(install.call_args.kwargs["desktop_id"],
+                         hotkey.CANCEL_DESKTOP_ID)
+        self.assertEqual(conf["cancel_shortcut"], "Meta+Shift+Space")
+
     def test_a_prompt_left_at_its_default_is_stored_as_empty(self):
         """So that switching the interface language switches the prompt too."""
         conf = cfg.Config()