feat(quickshell): replace fuzzel with an in-process launcher

fuzzel could only answer "which app", so launching Brave at a URL meant
picking the app, waiting for it, then typing the address somewhere else.
The launcher now takes a verb and an object in one line: type
`gitlab.enqs.de` and every app that can open it sorts to the top, default
browser first, ready for Enter — or arrow/hjkl down to Brave's New
Incognito Window, which is offered as a peer of Brave itself rather than
hidden behind a submenu.

services/Apps.qml is the brain and holds no UI: it flattens desktop
entries and their actions into one index, classifies the typed argument
(url / mail / path), ranks by fuzzy match plus handler affinity plus
frecency, and launches. Launching through `uwsm app` keeps each app in its
own scope; entries whose Exec declares no field code (Brave's
`--incognito` action, among others) are launched by tokenising Exec per
the Desktop Entry spec and appending the argument, never via `sh -c`.

Four prefixes reuse the same window, so there is one picker and one set of
keys: `>` runs a command, `=` evaluates arithmetic, `:` is clipboard
history (cliphist, which had been a second fuzzel invocation), and a
dmenu mode is driven over IPC.

quickshell/scripts/takemi-dmenu is the bridge for that last one — a
`fuzzel --dmenu` drop-in for scripts that want a picker, symlinked into
~/.local/bin. fluxo's bt menu now goes through it.

Living in the Quickshell process means the window is on screen on the
frame the bind fires, with no process to spawn.

Removes fuzzel entirely: its config, its theme submodule, the package,
and the last consumers (the bar sigil, fluxo's menu_command). Also drops
hypr/scripts/powermenu.sh, which was fuzzel-based and bound to nothing.

quickshell/services/Actions.qml

@@ -15,6 +15,12 @@ Singleton {
     property bool powerMenuOpen: false
     property bool lockRequested: false
     property bool sidebarOpen: false
+    property bool launcherOpen: false
+
+    // Seed text for the next launcher open. Lets a keybind or a script hand the
+    // launcher a query it did not have to type — `qs ipc call shell prompt
+    // "https://…"` is an open-with dialog for anything that can run a command.
+    property string launcherSeed: ""
 
     signal osdRequested(string kind)
 
@@ -22,6 +28,26 @@ Singleton {
     function closePowerMenu() { root.powerMenuOpen = false; }
     function lock() { root.powerMenuOpen = false; root.lockRequested = true; }
 
+    function toggleLauncher() {
+        if (!root.launcherOpen) root.launcherSeed = "";
+        root.launcherOpen = !root.launcherOpen;
+    }
+    function closeLauncher() { root.launcherOpen = false; }
+
+    // Stand in for `fuzzel --dmenu`. See Apps.beginDmenu for the transport.
+    function dmenuLauncher(inPath: string, outPath: string, prompt: string) {
+        Apps.beginDmenu(inPath, outPath, prompt);
+        root.launcherSeed = "";
+        root.launcherOpen = false;
+        root.launcherOpen = true;
+    }
+
+    function promptLauncher(seed: string) {
+        root.launcherSeed = seed;
+        root.launcherOpen = false;
+        root.launcherOpen = true;
+    }
+
     // ------------------------------------------------------------- commands
     // Each slot gets its own Process so a slow one cannot cancel another.
     Process { id: slotA }
@@ -62,6 +88,11 @@ Singleton {
 
         function lock(): void { root.lock(); }
         function power(): void { root.togglePowerMenu(); }
+        function launcher(): void { root.toggleLauncher(); }
+        function prompt(seed: string): void { root.promptLauncher(seed); }
+        function dmenu(inPath: string, outPath: string, prompt: string): void {
+            root.dmenuLauncher(inPath, outPath, prompt);
+        }
         function reloadConfig(): void { root.reloadShell(); }
         function toggleDnd(): void { Notifs.toggleDnd(); }
         function clearNotifications(): void { Notifs.clearAll(); }