chore(clerk-js): Create UI Retheme Changes Reminder GitHub workflow

.changeset/many-dragons-carry.md

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+---
+---

.github/workflows/ui-retheme-changes-reminder.yml

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+name: UI Retheme Changes Reminder
+
+on:
+  pull_request:
+    branches:
+      - main
+    paths:
+      - 'packages/clerk-js/src/ui/**'
+
+jobs:
+  check-changes:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check if comment already made
+        id: check_comment
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const issue_number = context.issue.number;
+            const comments = await github.rest.issues.listComments({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: issue_number
+            });
+            return comments.data.some(comment => comment.body.includes('ui-retheme-reminder'));
+
+      - name: Post a comment if changes detected and no comment exists
+        if: steps.check_comment.outputs.result != 'true'
+        uses: peter-evans/[email protected]
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          body: |
+            <!-- ui-retheme-reminder -->
+            # ⚠️ Changes detected under the ClerkJS `ui` directory!
+            **Don't forget to apply the same changes under the `/ui.retheme` directory:**
+            `packages/clerk-js/src/ui/**` ➡️ `packages/clerk-js/src/ui.retheme/**`
+
+            Also, you may need to update the following files:
+            - `packages/localizations/src/en-US.retheme.ts`
+            - `packages/localizations/src/index.retheme.ts`
+            - `packages/types/src/appearance.retheme.ts`
+            - `packages/types/src/clerk.retheme.ts`
+            - `packages/types/src/index.retheme.ts`
+            - `packages/types/src/localization.retheme.ts`