Update branch references from dev to main, refresh users and GitHub data

- Switch all CI, dependabot, and docs references from dev to main
- Update users list and screenshots via processUsers
- Refresh contributors and sponsors data

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/dependabot.yml

@@ -5,7 +5,7 @@ version: 2
 updates:
   - package-ecosystem: "npm"
     directory: "/"
-    target-branch: "dev"
+    target-branch: "main"
     schedule:
       interval: "weekly"
       day: "wednesday"
@@ -15,7 +15,7 @@ updates:
       - "dependencies"
   - package-ecosystem: "github-actions"
     directory: "/"
-    target-branch: "dev"
+    target-branch: "main"
     schedule:
       interval: "weekly"
       day: "wednesday"