Name the project Keystone, and move its paths and namespaces

The repository had no name of its own, only the framework's. It is now
Keystone, in the README, AGENTS.md, the settings window, notes commit
messages, calctl's PRODID and the user page's User-Agent.

Its files move off quickshell's name too:

  ~/.config/quickshell/greetings             -> ~/.config/keystone/
  ~/.config/quickshell/obs-scene-icons.json  -> ~/.config/keystone/
  $XDG_STATE_HOME/quickshell/desktop.json    -> $XDG_STATE_HOME/keystone/

~/.config/quickshell is Quickshell's own default config directory (a
bare qs loads its shell.qml), so sharing it was a collision rather than
a home. There is no fallback to the old paths: the files are moved once.

The layer namespaces become keystone-*, and the Hyprland blur rules in
hypr-theme are renamed to match in the same change. A running shell
keeps its old namespaces until restarted.

Left alone: the retired standalone mail and vm shells' namespaces,
which their READMEs keep as history; Quickshell's own app id, binary
and process name; and the repository directory.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/desktop/modules/mail/README.md b/desktop/modules/mail/README.md
index b6a3159..2349da6 100644
--- a/desktop/modules/mail/README.md
+++ b/desktop/modules/mail/README.md
@@ -5,7 +5,7 @@
 > from the drawer, or deep-link with `qs -p desktop ipc call drawer open mail`.
 > The scripts live under `desktop/modules/mail/`. See `desktop/README.md`; the
 > `blur-mail` namespace in the Theme section below is historical, since this
-> page now rides the drawer's `quickshell-desktop` surface.
+> page now rides the drawer's `keystone-desktop` surface.
 
 Unread mail across every account, as a tile and a page in the drawer.
 Opening the page shows the accounts; Escape or a click outside closes it.