chore: add /generate-changeset slash command workflow

Co-authored-by: codecalm <1282324+codecalm@users.noreply.github.com>

.github/workflows/generate-changeset.yml

@@ -0,0 +1,89 @@
+name: Generate Changeset
+
+on:
+  issue_comment:
+    types: [created]
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  generate-changeset:
+    name: Generate Changeset
+    if: >
+      github.event.issue.pull_request != null &&
+      contains(github.event.comment.body, '/generate-changeset')
+    runs-on: ubuntu-latest
+    steps:
+      - name: Add reaction to comment
+        uses: actions/github-script@v7
+        with:
+          script: |
+            await github.rest.reactions.createForIssueComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              comment_id: context.payload.comment.id,
+              content: '+1',
+            });
+
+      - name: Get PR branch info
+        id: pr
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const pr = await github.rest.pulls.get({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pull_number: context.issue.number,
+            });
+            core.setOutput('head_ref', pr.data.head.ref);
+            core.setOutput('head_sha', pr.data.head.sha);
+            core.setOutput('title', pr.data.title);
+
+      - name: Checkout PR branch
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ steps.pr.outputs.head_ref }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Parse bump type from comment
+        id: bump
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const body = context.payload.comment.body.trim();
+            const match = body.match(/\/generate-changeset\s+(patch|minor|major)/i);
+            core.setOutput('type', match ? match[1].toLowerCase() : 'patch');
+
+      - name: Generate changeset file
+        env:
+          BUMP_TYPE: ${{ steps.bump.outputs.type }}
+          PR_TITLE: ${{ steps.pr.outputs.title }}
+        run: |
+          CHANGESET_ID=$(tr -dc 'a-z' < /dev/urandom | fold -w 12 | head -n 1)
+          FILENAME=".changeset/${CHANGESET_ID}.md"
+
+          cat > "$FILENAME" << EOF
+          ---
+          "@tabler/core": $BUMP_TYPE
+          "@tabler/preview": $BUMP_TYPE
+          "@tabler/docs": $BUMP_TYPE
+          ---
+
+          $PR_TITLE
+          EOF
+
+          # Trim leading whitespace from heredoc
+          sed -i 's/^          //' "$FILENAME"
+
+          echo "Generated: $FILENAME"
+          cat "$FILENAME"
+
+      - name: Commit and push changeset
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add .changeset/
+          git commit -m "chore: add changeset for PR #${{ github.event.issue.number }}"
+          git push