Report only real device data and remove unverifiable fields

- Drop simulated-controller fallback: simulation now only runs when
  explicitly enabled in Settings (or outside Tauri), so the app no longer
  claims a controller is connected when none is plugged in
- Derive connection type from the kernel bus type (USB/Bluetooth) instead
  of an unreliable udev property
- Read real battery percentage from /sys/class/power_supply; hide the
  field entirely when the device reports none
- Remove Input mode and Firmware version fields (not obtainable)
- Query virtual controller status from the backend instead of a
  hardcoded per-device flag
- Exclude the app's own uinput virtual controller from device discovery
- Rescan for controllers indefinitely while disconnected so a controller
  plugged in at any time is detected without restarting
- Strip leftover debug instrumentation from the previous session

Co-authored-by: Cursor <cursoragent@cursor.com>

src-tauri/Cargo.toml

@@ -32,7 +32,6 @@ chrono = { version = "0.4", default-features = false, features = ["clock"] }
 uuid = { version = "1", features = ["v4"] }
 dirs = "6"
 evdev = "0.13"
-udev = "0.9"
 sysinfo = "0.37"
 
 [dev-dependencies]