Revert Unicode formatted text back to Markdown syntax in cleanText

- Add UNICODE_TO_STYLE reverse map to classify Unicode chars by font style
- Rewrite cleanText to group same-style runs and wrap in Markdown (**bold**, _italic_, **_bold-italic_**)

src/formatter.ts

@@ -1,4 +1,4 @@
-import { BOLD_MAP, ITALIC_MAP, BOLD_ITALIC_MAP, UNICODE_TO_ASCII_MAP } from "./unicode-maps";
+import { BOLD_MAP, ITALIC_MAP, BOLD_ITALIC_MAP, UNICODE_TO_ASCII_MAP, UNICODE_TO_STYLE } from "./unicode-maps";
 
 export type FormatStyle = "bold" | "italic" | "bold-italic";
 
@@ -20,7 +20,28 @@ export function cleanText(text: string): string {
 
         line = line.replace(/^\(\d+\) /, "").replace(/^\d+\/ /, "");
 
-        return [...line].map(ch => UNICODE_TO_ASCII_MAP.get(ch) ?? ch).join("");
+        const output: string[] = [];
+        let currentStyle: string | null = null;
+        let buf: string[] = [];
+
+        const flush = () => {
+            if (buf.length === 0) return;
+            const s = buf.join("");
+            if (currentStyle === "bold") output.push(`**${s}**`);
+            else if (currentStyle === "italic") output.push(`_${s}_`);
+            else if (currentStyle === "bold-italic") output.push(`**_${s}_**`);
+            else output.push(s);
+            buf = [];
+        };
+
+        for (const ch of line) {
+            const style = UNICODE_TO_STYLE.get(ch) ?? null;
+            const ascii = UNICODE_TO_ASCII_MAP.get(ch) ?? ch;
+            if (style !== currentStyle) { flush(); currentStyle = style; }
+            buf.push(ascii);
+        }
+        flush();
+        return output.join("");
     }).join("\n");
 }