Skip snap mounts in disk space detector

Filter out /snap/* and /boot/efi from disk monitoring on Linux.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

detectors/disk_space.py

@@ -48,6 +48,9 @@ def get_all_drives():
                     # Skip virtual filesystems
                     if not device.startswith("/dev/"):
                         continue
+                    # Skip snap mounts and other system paths
+                    if mount.startswith(("/snap/", "/boot/efi")):
+                        continue
                     # Skip duplicate devices (e.g., bind mounts)
                     if device in seen_devices:
                         continue