chore: scaffold SPFx solution with ui-kit

Clean SPFx 1.22 (heft) web part template with @tnsu/ui-kit wired in.
Starting point for merging the stroy-bot-* repositories.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

.prettierrc

@@ -0,0 +1,8 @@
+{
+  "singleQuote": true,
+  "tabWidth": 2,
+  "printWidth": 120,
+  "trailingComma": "none",
+  "semi": true,
+  "endOfLine": "auto"
+}