fix: FilePreview fileType case + Tailwind v4 gradient transparent bug

- FilePreview.vue: add normalizedFileType computed to handle backend
  returning uppercase HTML/MD/PPTX (fixes preview/download buttons)
- FilePreview.vue: bg-gradient-to-r from-orange-500 -> bg-orange-500
  (Tailwind v4 gradient + CSS variable = transparent)
- ReportCard.vue: bg-gradient-to-r -> bg-orange-600 for selected state
- Add .opencode/, node_modules/, dist/ to .gitignore
- Initial git setup for publish project

test-upload.py

@@ -0,0 +1,39 @@
+import urllib.request
+import json
+import io
+
+# Get first project
+req = urllib.request.Request('http://localhost:37821/api/projects/1')
+resp = urllib.request.urlopen(req)
+project = json.loads(resp.read().decode())
+print('Project before:', project)
+
+# Create a small test PNG image (1x1 pixel)
+png_data = b'\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x00\x00\x00\x01\x00\x00\x00\x01\x08\x02\x00\x00\x00\x90wS\xde\x00\x00\x00\x0cIDATx\x9cc\xf8\x0f\x00\x00\x00\x01\x00\x01\x00\x05\xfe\x02\xfe\x00\x00\x00\x00IEND\xaeB`\x82'
+
+# Upload cover image
+boundary = '----FormBoundary7MA4YWxkTrZu0gW'
+data = '--{}\r\nContent-Disposition: form-data; name="name"\r\n\r\nTest Project\r\n--{}\r\nContent-Disposition: form-data; name="coverImage"; filename="test.png"\r\nContent-Type: image/png\r\n\r\n'.format(boundary, boundary).encode() + png_data + '\r\n--{}--\r\n'.format(boundary).encode()
+
+req = urllib.request.Request(
+    'http://localhost:37821/api/projects/1',
+    data=data,
+    headers={
+        'Content-Type': 'multipart/form-data; boundary=' + boundary,
+    },
+    method='PUT'
+)
+
+try:
+    resp = urllib.request.urlopen(req)
+    result = json.loads(resp.read().decode())
+    print('Upload response:', result)
+    print('coverImage:', result.get('coverImage'))
+except Exception as e:
+    print('Error uploading:', e)
+
+# Check updated project
+req2 = urllib.request.Request('http://localhost:37821/api/projects/1')
+resp2 = urllib.request.urlopen(req2)
+project2 = json.loads(resp2.read().decode())
+print('Project after:', project2)