Adds a `for_browser_maplibre` factory, browser-bound MapLibre tools, and a
FastAPI WebSocket backend (`geoagent browser`) so a GeoAgent can drive a
live MapLibre map embedded in a browser web app.

- session.py: pick the per-call timeout via explicit ``None`` check so
  callers can pass ``0.0`` (or any falsy float) to force an immediate
  timeout instead of silently inheriting ``self.timeout_seconds``.
- server.py: accept an optional ``history`` payload on incoming chat
  messages and route it through ``build_prompt_with_context`` so
  multi-turn follow-ups have the same recent-transcript context the
  Solara UI and QGIS chat dock already provide.
- server.py: drop the ``active_chat.cancel()`` call on disconnect/error.
  The chat work runs inside ``asyncio.to_thread``, so cancelling the
  wrapping task does not actually stop the worker; let the task finish
  quietly and just clear the local reference instead.
- tests: add ``tests/test_browser_session.py`` covering the concurrency
  behaviors of ``BrowserMapSession`` (timeout raises
  ``BrowserMapTimeoutError``, ``resolve_result`` unblocks pending
  callers, ``fail_all`` releases every waiter, and an explicit
  ``timeout_seconds=0.0`` does not fall back to the default).

- Implemented a new TypeScript example for a browser-based map using MapLibre GL.
- Created a WebSocket connection to handle chat interactions and map commands.
- Added styles for the map interface and chat panel.
- Introduced TypeScript configuration for strict type checking.
- Enhanced the Python server to support streaming chat responses and tool execution.
- Updated CLI to set a default model provider.
- Added tests for WebSocket connection and chat streaming functionality.

- Added support for executing arbitrary JavaScript code in the browser using the `run_maplibre_script` tool.
- Updated README with prompt examples for new features including map navigation and layer management.
- Introduced `maplibre-gl-layer-control` for improved layer management in the MapLibre interface.
- Enhanced the main TypeScript file to include layer control and GeoAgent UI elements.
- Implemented new functions for handling GeoJSON overlays and layer definitions.
- Updated server and CLI to support new flags for allowing browser code execution and auto-approving browser tools.
- Added tests to ensure the new JavaScript execution feature is opt-in and confirmation gated.

- session.py: treat ``timeout_seconds`` as a total deadline shared between
  the send and response phases of ``BrowserMapSession.call``. Previously
  ``future.result(timeout=wait_timeout)`` and ``event.wait(wait_timeout)``
  each consumed the full budget, so a slow send could let the overall call
  block for up to ``2 * wait_timeout``. Now the response wait uses the
  remaining time until ``deadline`` so a caller-provided timeout means a
  single, total deadline.
- tests: add ``test_call_timeout_is_total_deadline`` to lock in the shared
  budget behavior and prevent regressions back to per-phase doubling.