refactor(hdd): rename is_in_hdd to is_hdd and fix macro capture variable

`is_in_hdd` checks whether a disk IS an HDD, not whether something is
IN an HDD — rename to `is_hdd`. Also rename the leftover `$mount`
macro capture variable to `$disk_name` to match its parameter name.

https://claude.ai/code/session_01MHKaZm6DcA9kjBPnW3KN5K

Author: claude

src/app/hdd.rs

@@ -262,11 +262,11 @@ fn path_is_in_hdd<Disk: DiskApi, Fs: FsApi>(path: &Path, disks: &[Disk]) -> bool
     disks
         .iter()
         .filter(|disk| disk.get_mount_point() == mount_point)
-        .any(|disk| is_in_hdd::<Fs>(disk))
+        .any(|disk| is_hdd::<Fs>(disk))
 }
 
 /// Check if a disk is an HDD after applying platform-specific corrections.
-fn is_in_hdd<Fs: FsApi>(disk: &impl DiskApi) -> bool {
+fn is_hdd<Fs: FsApi>(disk: &impl DiskApi) -> bool {
     let kind = disk.get_disk_kind();
     let name = disk.get_disk_name().to_str();
     match name {

src/app/hdd/test_linux.rs

@@ -55,7 +55,7 @@ macro_rules! identity_reclassify_test_case {
         $name:ident where
             block_device = $block:literal,
             driver = $driver:literal,
-            disk_name = $mount:literal,
+            disk_name = $disk_name:literal,
             expected = $expected:expr,
     ) => {
         $(#[$attr])*
@@ -83,7 +83,7 @@ macro_rules! identity_reclassify_test_case {
             }
 
             assert_eq!(
-                reclassify_virtual_hdd::<Fs>(DiskKind::HDD, $mount),
+                reclassify_virtual_hdd::<Fs>(DiskKind::HDD, $disk_name),
                 $expected,
             );
         }