Implement Unicode text formatter plugin

- Add unicode-maps.ts with BOLD_MAP, ITALIC_MAP, BOLD_ITALIC_MAP from Unicode Sans-Serif ranges
- Add formatter.ts with transformText(text, style) using the maps
- Add commands.ts registering three editorCallback commands (bold, italic, bold-italic)
- Replace sample plugin boilerplate in main.ts with UnicodeFormatterPlugin wired to registerCommands
- Update manifest.json with correct id, name, and description
- Delete unused settings.ts boilerplate

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

manifest.json

@@ -1,11 +1,11 @@
 {
-	"id": "sample-plugin",
-	"name": "Sample Plugin",
+	"id": "unicode-text-formatter",
+	"name": "Unicode Text Formatter",
 	"version": "1.0.0",
 	"minAppVersion": "0.15.0",
-	"description": "Demonstrates some of the capabilities of the Obsidian API.",
-	"author": "Obsidian",
-	"authorUrl": "https://obsidian.md",
-	"fundingUrl": "https://obsidian.md/pricing",
+	"description": "Format selected text as Unicode Sans-Serif Bold, Italic, or Bold-Italic for LinkedIn and Facebook posts.",
+	"author": "schihei",
+	"authorUrl": "",
+	"fundingUrl": "",
 	"isDesktopOnly": false
 }