refactor(filter): extract preset management logic into FilterPresetManager

Move filter preset creation, deletion, application, and storage logic
from FilterManager into a dedicated FilterPresetManager class to
improve separation of concerns and maintainability.

- Add FilterPresetManager with preset CRUD operations
- Update FilterManager to use preset manager via composition
- Handle EMPTY_WILDCARD_MARKER for wildcard base model filters
- Add preset-related translations to all locale files
- Update filter preset UI styling and interactions

py/routes/handlers/misc_handlers.py

@@ -255,6 +255,7 @@ class SettingsHandler:
         "model_name_display",
         "update_flag_strategy",
         "auto_organize_exclusions",
+        "filter_presets",
     )
 
     _PROXY_KEYS = {