Improve installer version detection using semantic version sorting

This update replaces string-based version comparison with proper semantic
version sorting using `packaging.version.Version`. This ensures that multiple
Affinity installer builds are always detected and ordered correctly, even when
version numbers include multi-digit components (e.g., 2.10.0 vs 2.9.1).

As a result, affinity-cli now selects the most recent installer reliably,
leading to more predictable and stable installation behavior—especially for
users maintaining both v1 and v2 installers in the same directory.

No breaking changes. This enhancement improves internal accuracy and overall
user experience when managing multiple Affinity installer versions.

Author: ind4skylivey

affinity_cli/installer_discovery.py

@@ -7,6 +7,8 @@
 from pathlib import Path
 from typing import Dict, List, Literal, Optional
 
+from packaging.version import Version
+
 PRODUCT_NAMES = {
     "photo": "Affinity Photo",
     "designer": "Affinity Designer",
@@ -59,7 +61,9 @@ def scan(self) -> List[InstallerInfo]:
                     path=file,
                 )
             )
-        installers.sort(key=lambda item: (item.product, item.version, item.file_version))
+        installers.sort(
+            key=lambda item: (item.product, item.version, Version(item.file_version))
+        )
         return installers
 
     def select_installer(