Add GitHub Actions workflow for HF Spaces sync

- Auto-sync to nus-project/annotation-dashboard on push to main
- Add file size checker for PR validation
- Add HF Spaces README with metadata

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.github/workflows/check-file-size.yml

@@ -0,0 +1,17 @@
+name: Check file size
+
+on:
+  pull_request:
+    branches: [main]
+
+  # to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  check-size:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check large files
+        uses: ActionsDesk/lfs-warning@v2.0
+        with:
+          filesizelimit: 10485760 # 10MB limit for HF Spaces

.github/workflows/sync-to-hf.yml

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+name: Sync to Hugging Face Spaces
+
+on:
+  push:
+    branches: [main]
+
+  # to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  sync-to-hub:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+          lfs: true
+      - name: Push to Hugging Face Space
+        env:
+          HF_TOKEN: ${{ secrets.HF_TOKEN }}
+        run: git push https://nus-project:$HF_TOKEN@huggingface.co/spaces/nus-project/annotation-dashboard main --force

README_HF.md

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+---
+title: Annotation Progress Dashboard
+emoji: 📊
+colorFrom: blue
+colorTo: green
+sdk: streamlit
+sdk_version: "1.32.0"
+app_file: app.py
+pinned: false
+---
+
+# Annotation Progress Dashboard
+
+Live dashboard for tracking Lithuanian NER annotation progress.
+
+## Configuration
+
+This Space requires the following secrets to be set:
+
+1. Go to Settings → Variables and secrets
+2. Add the following secrets:
+   - `LABEL_STUDIO_URL` = Your Label Studio instance URL
+   - `LABEL_STUDIO_API_KEY` = Your Label Studio API token
+
+## Features
+
+- Real-time progress metrics
+- Weekly team statistics
+- Category breakdown (mokslinis/ziniasklaida)
+- Completion projection based on recent pace
+- Auto-refresh every 5 minutes
+- Fast loading with smart caching
+
+## About
+
+This dashboard tracks annotation progress for Lithuanian NER (Named Entity Recognition) project. It connects to Label Studio API to fetch real-time statistics and visualize team performance.