Stabilize local dev merge

Align regression tests with the current Odysseus behavior after merging origin/dev into local main.

- keep phone/name-only contacts valid and cover null email without crashes

- pin explicit web-search false form submission in chat.js

- update Cookbook dependency/download completion tests for combined live + persisted output

- expose SGLang OS package repair hints from backend diagnosis

- treat MLX and MLX-community repos as servable on Apple Metal while keeping CUDA behavior unchanged

- keep desktop new-chat coverage on the shared preferred-model helper

- remove a hardcoded crop overlay portal z-index literal

- include the local agent-loop cleanup that removes the old manage_notes reminder repair shim

Verified with: docker run --rm -v /home/pewds/odysseus-cookbook-fresh:/app -w /app odysseus-cookbook-fresh-odysseus python3 -m pytest -q (4515 passed, 4 skipped).

routes/cookbook_helpers.py

@@ -1306,6 +1306,7 @@ def _diagnose_serve_output(text: str) -> dict | None:
             "SGLang native kernel/runtime is missing or mismatched on this server.",
             [
                 {"label": "repair sglang-kernel in this Python environment", "op": "dependency", "package": "sglang-kernel"},
+                {"label": "install OS packages: libnuma-dev python3.12-dev build-essential", "op": "manual"},
                 {"label": "if libnvrtc is still missing, install the matching CUDA/NVRTC runtime on this host", "op": "manual"},
             ],
         ),