feat(subtitles): add regex subtitle filters with built-in presets (#318)

- Add `subtitleFilter` config with four presets: parentheses, brackets, speaker prefix and music symbols. Custom regex rules run after the presets.
- Filter primary text where it enters the app (live `sub-text` and parsed cues), so the overlay, sidebar, mining and stats all get the same filtered text.
- Changes hot-reload: the current line is read again and the active track is parsed again, using the filter config as the prefetch parse key.
- Add a custom rule editor in Settings under Behavior → Subtitle Filters that checks patterns as you type.
- Update the config example, the configuration docs and the architecture domains doc, and add a changelog fragment.

src/types/config.ts

@@ -36,9 +36,11 @@ import type {
   FrequencyDictionaryMatchMode,
   FrequencyDictionaryMode,
   NPlusOneMatchMode,
+  ResolvedSubtitleFilterConfig,
   ResolvedSubtitleSidebarConfig,
   SecondarySubConfig,
   SubtitlePosition,
+  SubtitleFilterConfig,
   SubtitleSidebarConfig,
   SubtitleStyleConfig,
 } from './subtitle';
@@ -170,6 +172,7 @@ export interface Config {
   startupWarmups?: StartupWarmupsConfig;
   subtitleStyle?: SubtitleStyleConfig;
   subtitleSidebar?: SubtitleSidebarConfig;
+  subtitleFilter?: SubtitleFilterConfig;
   auto_start_overlay?: boolean;
   jimaku?: JimakuConfig;
   /** @deprecated Use tsukihime. */
@@ -344,6 +347,7 @@ export interface ResolvedConfig {
     };
   };
   subtitleSidebar: ResolvedSubtitleSidebarConfig;
+  subtitleFilter: ResolvedSubtitleFilterConfig;
   auto_start_overlay: boolean;
   jimaku: JimakuConfig & {
     apiBaseUrl: string;