feat: rewrite Windows device detection with native Win32 APIs

Replace PowerShell with Win32 APIs (CreateFileW, DeviceIoControl) for reliable
device enumeration on all Windows editions.

Key improvements:
- Add IOCTL_DISK_GET_DRIVE_GEOMETRY_EX for disk size and geometry
- Add IOCTL_STORAGE_QUERY_PROPERTY for bus type and model detection
- Add drive letter mapping via GetLogicalDrives() and volume extents
- Fix system disk detection (check for C: drive instead of assuming disk 0)
- Add smart stop: halt enumeration after 4 consecutive non-existent drives
- Refactor: extract helpers, reduce code by 26% (475→349 lines)

Error handling:
- Suppress expected errors (1,2,5,21) to eliminate log spam
- Only log unexpected device failures

Fixes device enumeration failures on Windows editions without PowerShell.

src-tauri/src/devices/macos.rs

@@ -181,7 +181,11 @@ fn get_disk_info(disk_path: &str) -> Result<BlockDevice, String> {
 
     Ok(BlockDevice {
         path: disk_path.to_string(),
-        name: disk_path.split('/').last().unwrap_or(disk_path).to_string(),
+        name: disk_path
+            .split('/')
+            .next_back()
+            .unwrap_or(disk_path)
+            .to_string(),
         size,
         size_formatted: format_size(size),
         model,

src-tauri/src/flash/macos/bindings.rs

@@ -55,17 +55,11 @@ pub struct AuthorizationEnvironment {
 
 /// External form for passing authorization between processes
 #[repr(C)]
-#[derive(Clone, Copy)]
+#[derive(Clone, Copy, Default)]
 pub struct AuthorizationExternalForm {
     pub bytes: [u8; 32],
 }
 
-impl Default for AuthorizationExternalForm {
-    fn default() -> Self {
-        Self { bytes: [0u8; 32] }
-    }
-}
-
 // Authorization flags
 pub const K_AUTHORIZATION_FLAG_INTERACTION_ALLOWED: u32 = 1 << 0;
 pub const K_AUTHORIZATION_FLAG_EXTEND_RIGHTS: u32 = 1 << 1;