internal/thumbs is internal/media, with Inspect: what a file holds, from ffprobe

The package was named for its first job; it now also decides what a file is for the
Files tab (image, video, audio) and reads its streams, which the viewer will need. Inspect
is the richer probe — codec, profile, pixel format, size, frame rate, HDR transfer, the
audio beside it, container and duration — run as root through sudo when asked.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

cmd/hamlab/main.go

@@ -41,7 +41,7 @@ import (
 	"hamlab/internal/store"
 	"hamlab/internal/tasks"
 	hterm "hamlab/internal/term"
-	"hamlab/internal/thumbs"
+	"hamlab/internal/media"
 	"hamlab/internal/tlsauto"
 	"hamlab/internal/updates"
 	"hamlab/internal/web"
@@ -84,7 +84,7 @@ func main() {
 	case "fs": // privileged helper for the Files tab (run as root by the daemon)
 		os.Exit(files.Helper(flag.Args()[1:], os.Stdin, os.Stdout, os.Stderr))
 	case "thumb": // privileged helper for the Files tab's previews in root mode (run as root by the daemon)
-		os.Exit(thumbs.Helper(flag.Args()[1:], os.Stdin, os.Stdout, os.Stderr))
+		os.Exit(media.Helper(flag.Args()[1:], os.Stdin, os.Stdout, os.Stderr))
 	case "space-walk": // helper for the Space tab: measure mountpoints, stream the tree back
 		os.Exit(space.Helper(flag.Args()[1:], os.Stdin, os.Stdout, os.Stderr))
 	case "drm-clients": // privileged helper for the GPU readings: who has the GPU open (run as root by the daemon)