feat: use authored category names for mods

Store categories as authored strings. Trim and deduplicate without changing case, compare without case sensitivity, and keep all observed categories available to filters and editors.

locale/ui_en.properties

@@ -57,20 +57,20 @@ mods/catalog_export = Export to Catalog
 mods/catalog_title = Export Catalog Entry
 mods/catalog_download_url = Download URL
 mods/catalog_category = Category
-mods/category_story = Story
-mods/category_characters = Characters
-mods/category_gameplay = Gameplay
-mods/category_visual = Visual
-mods/category_audio = Audio
-mods/category_ui = UI
-mods/category_locale = Locale
-mods/category_library = Library
-mods/category_engine = Engine
-mods/category_overhaul = Overhaul
-mods/category_tools = Tools
-mods/category_editor = Editor
-mods/category_debug = Debug
-mods/category_other = Other
+mod_category/story = Story
+mod_category/characters = Characters
+mod_category/gameplay = Gameplay
+mod_category/visual = Visual
+mod_category/audio = Audio
+mod_category/ui = UI
+mod_category/locale = Locale
+mod_category/library = Library
+mod_category/engine = Engine
+mod_category/overhaul = Overhaul
+mod_category/tools = Tools
+mod_category/editor = Editor
+mod_category/debug = Debug
+mod_category/other = Other
 mods/catalog_tags = Tags (comma-separated)
 mods/catalog_changelog = Changelog
 mods/catalog_status = Status
@@ -269,3 +269,23 @@ tools/menu_title = Tools
 
 # --- Development cover ---
 ui/cover/in_development = In development
+
+mod_categories/title = Categories
+mod_categories/code = Category, e.g. RPG — Gear
+mod_categories/add = Add
+mod_categories/primary = Primary category
+mod_categories/suggestions = Choose a category…
+mod_categories/save = Save categories
+mod_categories/saved = Categories saved to manifest.json.
+mod_categories/development = Saved in the development mod before packaging.
+mod_categories/readonly = Categories of installed packages and catalog entries are read-only. Edit the development folder.
+mod_categories/pending = Add the typed category or clear the input before continuing.
+
+mod_categories/hint_code = Enter any category name; spelling is preserved.
+mod_categories/hint_suggestions = Choose a category from installed mods, catalogs or the base suggestions.
+mod_categories/hint_primary = The primary category appears on the card and determines its group. It is saved first.
+mod_categories/hint_add = Add the entered category.
+mod_categories/hint_base = Include or remove this category.
+mod_categories/hint_remove = Remove this custom category.
+
+mod_categories/hint_filter = Show mods with this category: