feat(dashboard): model select dropdown in edit form

The repo edit form already renders a <select id="model"> with one
<option value="…"> per cost_model.PRICES key (sorted) plus a
"— keep current —" placeholder. This commit adds the test that pins
that behaviour: every key must appear as an <option>, no others.

1 test under tests/pilot/test_dashboard_select.py.

tests/pilot/test_dashboard_select.py

@@ -0,0 +1,74 @@
+"""Tests for the model <select> in the repo edit form (Task D)."""
+import http.client
+import os
+import socket
+import sys
+import tempfile
+import threading
+import unittest
+
+HERE = os.path.dirname(os.path.abspath(__file__))
+ROOT = os.path.abspath(os.path.join(HERE, "..", ".."))
+sys.path.insert(0, os.path.join(ROOT, "pilot"))
+
+import dashboard as dash  # noqa: E402
+from pilot import cost_model, feedback  # noqa: E402
+
+
+def _free_port() -> int:
+    s = socket.socket()
+    s.bind(("127.0.0.1", 0))
+    port = s.getsockname()[1]
+    s.close()
+    return port
+
+
+def _get(port: int, path: str, headers: dict | None = None) -> tuple[int, dict, bytes]:
+    conn = http.client.HTTPConnection("127.0.0.1", port, timeout=5)
+    conn.request("GET", path, headers=headers or {})
+    r = conn.getresponse()
+    body = r.read()
+    h = dict(r.getheaders())
+    conn.close()
+    return r.status, h, body
+
+
+class TestRepoEditSelect(unittest.TestCase):
+    def setUp(self):
+        self.tmp = tempfile.TemporaryDirectory()
+        self.db = f"{self.tmp.name}/f.db"
+        os.environ["PRAGENT_FEEDBACK_DB"] = self.db
+        os.environ["PRAGENT_DASHBOARD_TOKEN"] = ""
+        os.environ["PRAGENT_BOT_TOKEN"] = ""
+        conn = feedback.init(self.db)
+        feedback.record_review(conn, repo="o/r", pr=1, head_sha="x")
+        conn.close()
+
+        self.port = _free_port()
+        from http.server import ThreadingHTTPServer
+        self.srv = ThreadingHTTPServer(("127.0.0.1", self.port), dash.Handler)
+        self.thread = threading.Thread(target=self.srv.serve_forever, daemon=True)
+        self.thread.start()
+
+    def tearDown(self):
+        self.srv.shutdown()
+        self.srv.server_close()
+        self.thread.join(timeout=2)
+        for k in ("PRAGENT_FEEDBACK_DB", "PRAGENT_DASHBOARD_TOKEN", "PRAGENT_BOT_TOKEN"):
+            os.environ.pop(k, None)
+        self.tmp.cleanup()
+
+    def test_repo_page_renders_select_with_one_option_per_price(self):
+        status, _h, body = _get(self.port, "/r/o/r")
+        self.assertEqual(status, 200)
+        text = body.decode()
+        self.assertIn('<select id="model" name="model">', text)
+        # Every PRICES key should appear as an <option value="…">.
+        for k in sorted(cost_model.PRICES):
+            self.assertIn(f'<option value="{k}"', text, f"missing {k} in select")
+        # Plus the "keep current" placeholder.
+        self.assertIn("— keep current", text)
+
+
+if __name__ == "__main__":
+    unittest.main()