[GameSelector] Persist quick-filter toolbar edits and repair filter settings migration (#7500)

* [GameSelector] Persist quick-filter toolbar edits and repair filter settings migration

- Save game-filter parameters on toolbar changes, debounced with flush on close
- Repair pre-camelCase gamefilters.ini keys in place on startup
- Map the legacy creator-name filter to hostNameFilter
- Balance begin/endFilterChange in GamesProxyModel::refresh
- Align the hideIgnoredUserGames default between model and settings
- Cover the migration with regression tests

* [Review] Address RickyRister comments on filter persistence

- Rename game-type prefix constants to SCREAMING_SNAKE to match
  MIGRATION_SENTINEL_KEY and project style
- Document why GameSelector destructor flushes a pending debounced
  filter save (toolbar path has no other writer)

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Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

cockatrice/src/client/settings/cache_settings.cpp

@@ -133,6 +133,10 @@ SettingsCache::SettingsCache()
     // Migrate settings from global.ini to per-class INI files (runs at most once)
     SettingsMigration::migrateSettingsFromGlobalIni(settingsPath);
 
+    // Repair gamefilters.ini keys renamed to camelCase by #7084 for profiles that migrated
+    // before that rename (idempotent, safe to run on every startup, portable builds included).
+    SettingsMigration::migrateGameFiltersToCamelCase(settingsPath);
+
     shortcutsSettings = new ShortcutsSettings(settingsPath, this);
     cardDatabaseSettings = new CardDatabaseSettings(settingsPath, this);
     serversSettings = new ServersSettings(settingsPath, this);