Fix plugin ID, package metadata, and formatter consistency issues

- Correct plugin ID in manifest.json to match folder name (obsidian-unicode-formatter)
- Update package.json name and description from sample template defaults
- Make markdownToLinkedIn handle both '- ' and '* ' list markers
- Enhance cleanText to also strip em-dash, arrow, and numbered-list prefixes

manifest.json

@@ -1,5 +1,5 @@
 {
-	"id": "unicode-text-formatter",
+	"id": "obsidian-unicode-formatter",
 	"name": "Unicode Text Formatter",
 	"version": "1.0.0",
 	"minAppVersion": "0.15.0",