Fix: Keep the screenshot picker out of its own capture

The picker paints an opaque frozen frame edge to edge, so the blur and dim
it inherited from the shared qs-overlay rule were compositor work on pixels
nobody sees. It now has its own layer rule.

no_anim is the load-bearing part. Capture.qml unmaps the picker and runs
grim 90ms later, and the default 200ms layersOut fade put the half-faded
picker, dimming and all, into every screenshot.

config/dot/hypr/rules.lua

@@ -269,16 +269,28 @@ hl.layer_rule({
     ignore_alpha = 0.2,
 })
 
--- Overview, capture and local screen-reading UI dim the desktop behind them.
+-- Overview and local screen-reading UI dim the desktop behind them.
 hl.layer_rule({
     name  = "qs-overlay",
-    match = { namespace = "^qs-(overview|capture|screen-intelligence)$" },
+    match = { namespace = "^qs-(overview|screen-intelligence)$" },
     blur         = true,
     ignore_alpha = 0.4,
     dim_around   = true,
     no_screen_share = true,
 })
 
+-- The screenshot picker paints an opaque frozen frame edge to edge, so blur and
+-- dim would be compositor work on pixels nobody sees. no_anim is load-bearing:
+-- services/Capture.qml unmaps the picker and runs grim 90ms later, and the
+-- 200ms layersOut fade would otherwise put the half-faded picker, dimming and
+-- all, into every screenshot.
+hl.layer_rule({
+    name  = "qs-capture",
+    match = { namespace = "^qs-capture$" },
+    no_anim         = true,
+    no_screen_share = true,
+})
+
 -- Notification toasts. Blurred like every other shell surface -- without this
 -- the cards are a near-transparent fill sitting directly on the wallpaper and
 -- read as washed out rather than as glass.

config/dot/quickshell/services/Capture.qml

@@ -341,7 +341,10 @@ esac'
         property bool record: false
         property bool intelligence: false
         // A handful of frames at 60Hz, enough for the compositor to recomposite
-        // the output without the overlay on it.
+        // the output without the overlay on it. Only enough because the
+        // qs-capture layer rule in hypr/rules.lua sets no_anim: with the
+        // default 200ms layersOut fade the half-faded picker would still be
+        // on screen when grim reads it.
         interval: 90
         onTriggered: {
             const r = commitDelay.rect;