feat(hyprlua): size filepicker dialog to 5% of the display

Add a size rule alongside the move so the zenity dialog no longer opens
at its default ~50% size. zenity clamps to its GTK minimum (~738x363),
which is well under half the screen.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

desktopenvs/hyprlua/hypr/usr/windowrules.lua

@@ -73,12 +73,13 @@ hl.window_rule({
     size  = "(monitor_w*0.2) (monitor_h*0.2)",
 })
 
--- filepicker — float near the top-left, 5% into the display
+-- filepicker — float near the top-left, sized 5% of the display
 hl.window_rule({
     name  = "filepicker",
     match = { tag = "filepicker" },
     float = true,
     move  = "(monitor_w*0.05) (monitor_h*0.05)",
+    size  = "(monitor_w*0.05) (monitor_h*0.05)",
 })
 
 -- spotify floating