v0.52.0 — The search answer stream and the mind map

[0.52.0] - 2026-10-21

The search answer stream and the mind map work end to end

• Fixed a real streaming panic: the search app completion bridge sent chunks with
  blocking_send on a bounded channel from inside the async runtime, which
  panicked on the first streamed chunk and left the AI-summary block empty. It
  now uses an unbounded channel; the probe renders the streamed answer, one
  citation chip and the divider.
• Fixed a page-level ReferenceError: searchRerankToggle is not defined when the
  search page is opened with a saved app (?sapp=): the seed applier ran before
  the later script defines the toggle. The call is now guarded.
• Verified the mind-map flow against a reachable chat model: the button opens
  the sheet, the mock model's tree renders seven nodes, and close/clear behave.
• Serialized the OAuth flow-registry unit tests: two tests cleared the process-wide
  registry concurrently and could flake the round-trip assertion.
• Withdrawn a stale residual: the upstream v0.27.2 tree-select rows are plain
  divs with hover/selected accent styles and no Radix focus ring, so the old
  "approximated focus styling" note no longer applies; RayRAG's keyboard roving
  focus is an accessibility superset.