Merge master: the shortcut table, local models, and a Mac still in them

Four files disagreed, and all four the same way: master had turned things the
Mac branch wrote out by hand into one list to read from.

Shortcuts are the whole of it. master gave every binding a row in
hotkey.SHORTCUTS, so the Mac's DESKTOP_IDS is gone and CarbonHotkey reads the
desktop id off that row, which also gives the new cancel key a status line on a
Mac. Settings builds its four rows through master's _shortcut_row, and that one
now asks _install_buttons for Install and Remove, so macOS gets a combination
box and nothing to press, and everywhere else the button says the desktop's own
name. dikte.py starts the listener from the same table, on macOS whatever the
setting says: there is nothing installed for it to be a fallback to.

The rest is two imports and a paste list that lives in paste.Desktop now.

tests/__init__.py

@@ -27,7 +27,7 @@ atexit.register(shutil.rmtree, _SANDBOX, True)
 # A key sitting in the environment would otherwise reach the code that falls
 # back to it, and the tests for "there is no key" would pass only on a machine
 # without one.
-for _var in ("OPENAI_API_KEY", "OPENROUTER_API_KEY"):
+for _var in ("OPENAI_API_KEY", "GROQ_API_KEY", "OPENROUTER_API_KEY"):
     os.environ.pop(_var, None)
 
 # The interface language leaks through module-level state, so the tests fix it