Let the pointer pass through panels you pick, like a performance overlay

A head-locked performance overlay kept catching the 3D mouse. It has no
input method, so SteamVR's laser passes through it, but the helper hit
tests every visible overlay with ComputeOverlayIntersection, and the dot
stuck to it whenever it crossed that corner of the view.

POINTER_IGNORE in frametop.conf now lists overlay keys the helper leaves
out of the collision, comma-separated shell patterns, so "vendor.app*"
covers a whole app, including panels it opens later. The laser starts
just before the cursor point, so an ignored panel nearer to you doesn't
catch it either.

Frametop Input Settings has a new Ignored panels page. It asks the
helper for SteamVR's overlays ("overlays", answered from the list's
thread once vrcmd has run again, even while the pointer is off), groups
them by app, and has a checkbox per panel and one for the whole app.
Frametop's own screens aren't offered, since ignoring one would leave
nothing to click the app on with the mouse. Entries for apps that
aren't open are listed so they can be removed.

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

session/frametop.conf.example

@@ -19,6 +19,7 @@ POINTER_LASER_WIDTH=0.8    # controller beam width (dashboard.laserRayWidthScale
 POINTER_ORIGIN_MARGIN=0.15   # the laser starts at least this far (m) in front of its target, so small floating controls stay hittable
 POINTER_SCENE_RADIUS=0.5   # texture-less dashboard overlays (dock, window controls): hit radius (m) around their origin
 POINTER_EDGE_REACH=0.3     # just off a panel, the cursor stays on its plane this far (m), to reach its resize edges and window controls
+POINTER_IGNORE=            # overlay keys the cursor passes through, comma-separated; vendor.app* covers an app (Frametop Input Settings > Ignored panels)
 POINTER_FOLLOW=0           # 1 = the cursor follows your head on a leash (a mouse button mapped to Head follow on/off toggles it)
 POINTER_LEASH_DEG=10       # head follow: how far (degrees) your head can turn before the cursor comes along; 0 locks it to your view
 POINTER_LEASH_DELAY=0.2    # head follow: how long (s) your head has to stay past the leash, so a glance doesn't move the cursor