Add Markdown to Post Format command and fix non-breaking space before period

- New markdownToLinkedIn() function converts Markdown to LinkedIn/Facebook-ready text:
  ## headings → Unicode bold, **bold** → Unicode bold, _italic_ → Unicode italic,
  - list items → em-dash bullets; blank lines and heading spacing handled correctly
- New "Convert Markdown to Post Format" command registered in commands.ts
- Fix space-before-period cleanup to also strip U+00A0 (non-breaking space),
  which Obsidian inserts after bold/formatted text (/ \./g → /[ \u00A0]\./g)
- Update README to document the new command and updated function list

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/formatter.ts

@@ -46,3 +46,54 @@ export function numberedListParens(text: string): string {
         return `(${n}) ${content}`;
     }).join("\n");
 }
+
+export function applyInlineMarkdown(text: string): string {
+    return text.replace(/\*\*(.+?)\*\*|_(.+?)_/g, (_match, bold, italic) => {
+        if (bold !== undefined) return transformText(bold, "bold");
+        return transformText(italic, "italic");
+    });
+}
+
+export function markdownToLinkedIn(text: string): string {
+    const lines = text.split("\n");
+    const output: string[] = [];
+    let pendingBlanks = 0;
+    let skipNextBlanks = false;
+    let inListContext = false;
+
+    for (const line of lines) {
+        if (line.trim() === "") {
+            if (!skipNextBlanks) pendingBlanks++;
+            continue;
+        }
+
+        skipNextBlanks = false;
+
+        if (line.startsWith("## ")) {
+            for (let i = 0; i < pendingBlanks; i++) output.push("");
+            pendingBlanks = 0;
+            inListContext = false;
+            const headingText = line.slice(3);
+            output.push(transformText(applyInlineMarkdown(headingText), "bold") + "  ");
+            skipNextBlanks = true;
+            continue;
+        }
+
+        if (line.startsWith("- ")) {
+            if (!inListContext) {
+                for (let i = 0; i < pendingBlanks; i++) output.push("");
+            }
+            pendingBlanks = 0;
+            output.push("— " + applyInlineMarkdown(line.slice(2)) + "  ");
+            inListContext = true;
+            continue;
+        }
+
+        for (let i = 0; i < pendingBlanks; i++) output.push("");
+        pendingBlanks = 0;
+        inListContext = false;
+        output.push(applyInlineMarkdown(line));
+    }
+
+    return output.join("\n").replace(/[ \u00A0]\./g, ".").trimEnd();
+}