Fix mods view showing wrong download status for name-mismatched mods

_find_folder() used a plain lowercase compare which failed when the
server canonical folder name differs from the comparison.json mod name
in more than just case (e.g. spaces vs underscores: "NIArms All in One"
vs "@NIArms_All_In_One"). These mods showed ✗ even though the pipeline
found and linked them correctly.

Add a normalized-name fallback (strips non-alphanumeric, same logic as
fetcher._normalize_name) so the lookup matches the same way the fetcher
resolves mods from the server index.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

gui/views/mods.py

@@ -7,6 +7,7 @@ from typing import TYPE_CHECKING, Optional
 
 import customtkinter as ctk
 
+from arma_modlist_tools.fetcher import _normalize_name
 from gui._constants import COLOR_OK, COLOR_ERROR, COLOR_WARN, COLOR_RUNNING
 from gui.views.base import BaseView
 
@@ -15,15 +16,26 @@ if TYPE_CHECKING:
 
 
 def _find_folder(group_dir: Path, mod_name: str) -> Optional[Path]:
-    """Return the local mod folder path, or None if not downloaded."""
+    """Return the local mod folder path, or None if not downloaded.
+
+    Matches in priority order:
+    1. Exact folder name ``@{mod_name}``
+    2. Case-insensitive name (handles ``@CBA_A3`` vs ``CBA_A3``)
+    3. Normalized name — strips non-alphanumeric (handles ``@cba_a3`` vs ``CBA A3``)
+    """
     if not group_dir.is_dir():
         return None
     candidate = group_dir / f"@{mod_name}"
     if candidate.is_dir():
         return candidate
-    target = mod_name.lower()
+    target_lower = mod_name.lower()
+    target_norm  = _normalize_name(mod_name)
     for p in group_dir.iterdir():
-        if p.is_dir() and p.name.lstrip("@").lower() == target:
+        if not p.is_dir():
+            continue
+        if p.name.lstrip("@").lower() == target_lower:
+            return p
+        if _normalize_name(p.name) == target_norm:
             return p
     return None