feat: phases 77–80 — navbar view refresh, static background, API tokens, history suggestion chips

Single consolidated commit for four completed, validated phases (77, 78,
79, 80). The pipeline run left all work uncommitted because the harness
commits only with PHASE_COMMIT=1 while child executors are forbidden from
committing; the phases themselves all passed validation and moved to
.agents/phases/complete/.

Phase 77 — navbar view refresh
- router.js dispatches bor:view-refresh on re-show / active re-click /
  popstate (gated on wasMounted; first show and boot exempt)
- History / RAG / Sources / Tuning re-fetch on refresh (admin branch);
  Chat deliberately excluded (stream survival)
- History "Refresh" button (admin-only, in-flight disable + status line)
- New story suite tests/e2e/test_navbar_refresh.py (7 tests)

Phase 78 — static background
- Removed the animated glow layers; static 44px grid over the flat --bg
  canvas; default and reduced-motion renders byte-identical
- Updated background/theme E2E suites; removed bg-glow test pins

Phase 79 — API tokens
- api_tokens model + migration 0012; hash-only token service
- Admin tokens API + Tokens admin view; POST /api/token-auth;
  live-revoking require_user on chat / suggestions / document content
- Frontend token gate with localStorage cache; anonymous E2E suites
  migrated to token login
- New story suite tests/e2e/test_api_tokens.py (9 tests)

Phase 80 — history suggestion chips
- last_questions() endpoint with SEED fallback; startNewChat() refetch
- Seed-semantics docs (config.py, .env.example, README)
- Integration state matrix + E2E suite rewritten to the 4 chip states

Also included: phase-76 report artifacts and the repo restore-test-db
skill (previously untracked), scripts/* ruff fixes from phase 77.

Final gate state (phase 80 final pass, covers everything above):
- uv run pytest --cov=app → 1637 passed, 0 failed, app/ coverage 99%
- uv run ruff check . && uv run pyright → clean, 0 errors
- Per-phase story E2E suites green in isolation

tests/unit/test_chat_cancel.py

@@ -22,6 +22,7 @@ query_log row; structured ``error`` frame, not logged as cancelled).
 from __future__ import annotations
 
 import asyncio
+import base64
 import gc
 import json
 import logging
@@ -32,9 +33,10 @@ from types import SimpleNamespace
 from typing import Any
 
 import pytest
+from itsdangerous import TimestampSigner
 
 from app.api import chat as chat_api
-from app.config import Settings
+from app.config import Settings, get_settings
 from app.main import app as fastapi_app
 from app.models import Document, KbOverview, QueryLog
 from app.rag.llm import LLMClient
@@ -195,6 +197,21 @@ def _install_llm(monkeypatch: pytest.MonkeyPatch, llm: LLMClient) -> None:
 # ---------- the ASGI driver (client disconnect at the ASGI boundary) ----------
 
 
+def _admin_cookie_header() -> tuple[bytes, bytes]:
+    """A valid signed ``bor_session`` cookie carrying the admin session.
+
+    Phase 79 (task 03): ``POST /api/chat`` is user-gated, and the raw
+    ASGI scope below carries no browser — so it presents the same signed
+    cookie ``SessionMiddleware`` would have emitted after
+    ``POST /api/login`` (the admin session short-circuits
+    ``require_user``; the anonymous 401 contract is pinned in
+    ``test_auth_api.py``)."""
+    settings = get_settings()
+    data = base64.b64encode(json.dumps({"admin": True}).encode("utf-8"))
+    signed = TimestampSigner(settings.session_secret).sign(data)
+    return b"cookie", f"{settings.session_cookie}={signed.decode('ascii')}".encode("ascii")
+
+
 def _scope() -> dict[str, Any]:
     return {
         "type": "http",
@@ -209,6 +226,7 @@ def _scope() -> dict[str, Any]:
         "headers": [
             (b"host", b"testserver"),
             (b"content-type", b"application/json"),
+            _admin_cookie_header(),  # phase 79: the signed-in admin
         ],
         "client": ("testclient", 50000),
         "server": ("testserver", 80),