feat(l10n): add Polish translations

Translate all 253 user-facing strings to Polish (standard professional UI
register; gender-neutral phrasing; count strings use number-neutral "label:
{count}" form). transfer_file_count uses full CLDR plural categories
(one/few/many/other). Generates values-pl/strings.xml for KMP, pl localizations
in the Apple catalog, and adds pl to CFBundleLocalizations.

apple/VniDrop/Resources/Info.plist

@@ -10,6 +10,7 @@
 		<string>it</string>
 		<string>de</string>
 		<string>pt</string>
+		<string>pl</string>
 	</array>
 	<key>CADisableMinimumFrameDurationOnPhone</key>
 	<true/>