feat(spellcheck): ✨ Update spell-checker algorithm to support custom dictionaries and improve language accuracy

Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>

src/spellcheck/spell-checker.ts

@@ -284,6 +284,13 @@ export class SpellChecker {
         suggestions.slice(1),
       );
 
+      // Boost confidence when aggressive normalization was used and found a match.
+      // The fact that heavy garbling (repeated chars, embedded digits) normalized
+      // to something within edit distance of a real word is strong evidence of a typo.
+      if (confidenceBaseWord !== normalizedWord) {
+        confidence = Math.min(confidence * 1.2, 1.0);
+      }
+
       // Adjust confidence for technical context if detected.
       // Skip when aggressive normalization was used — garbled words like "mmmporttANT"
       // aren't real technical identifiers despite matching camelCase patterns.