perf(tokenizer): single-pass Yomitan scan with cross-line caching and prefetch fixes (#185)

src/core/services/tokenizer/character-dictionary-title.ts

@@ -0,0 +1,4 @@
+// Title prefix of the dictionaries SubMiner generates per media. Lives on its
+// own because both the main process and the injected scan runtime match on it,
+// and the injected fragments interpolate it into their own source.
+export const CHARACTER_DICTIONARY_TITLE_PREFIX = 'SubMiner Character Dictionary';