Delete commented-out code that forced pypylon to create emulation virtual cameras (PYLON_CAMEMU), which was only intended for testing and should not be enabled for release. Also remove an extraneous blank line to tidy up the file.

Introduce a TriggerUiProfile dataclass and trigger_ui_profile_for_backend() to drive dialog presentation per backend. Replace free-text source field with an editable QComboBox providing backend suggestions and defaults. Add profile-driven visibility/enabling for input, master, software and strobe/line output fields, plus helper methods to manage form rows and combo text. Only include strobe-related payload fields when the backend profile exposes them. Misc: expand info/help text, show backend in group title, increase dialog min-width, refine tooltips, and improve model↔UI mapping and payload construction.

Previously the default trigger configuration was only applied for backend 'gentl' and always stored under the 'gentl' properties key. This change treats the backend name dynamically (accepting both 'gentl' and 'basler'), and stores the default trigger settings under the actual backend key in cam.properties. Also preserves behavior when cam.properties or the backend namespace is not a dict.

Reduce log flooding when waiting for hardware triggers by adding throttled logging.

Changes in dlclivegui/services/multi_camera_controller.py:
- Import time.
- Add a new _log_interval_while_waiting_for_trigger_s attribute to SingleCameraWorker.
- Replace the direct LOGGER.debug call for expected trigger wait timeouts with a call to _log_trigger_wait_throttled.
- Implement _log_trigger_wait_throttled to suppress repeated timeout messages, emit a consolidated debug message, and report how many repeated logs were suppressed.

This prevents high-frequency expected poll-timeout logs (common in trigger-waiting modes) from overwhelming the logs.

Extend the test conftest FakePylon to better emulate pypylon: add FakePylonTimeoutException, richer _Feature (symbolics, min/max/inc, read/write checks, call tracking), _EnumEntry, expanded _DeviceInfo, GrabResult.release tracking, and a more complete InstantCamera (timeouts, software trigger, trigger/line features, buffer and grab controls, test knobs). Reset the fake factory and provide default fake devices and a basler_settings_factory fixture. Patch the basler SDK fixture to use FakePylon. Add new test suite tests/cameras/backends/test_basler_backend.py covering lifecycle (open/read/close, fast-start, idempotent close), discovery/rebind, resolution/exposure/gain/fps handling, and comprehensive trigger behavior (follower/master/software/external) to validate backend logic.

Integrates optional WorkerTimingStats into the Basler camera backend and refactors FPS handling and frame retrieval. Adds a _configure_frame_rate() helper to centralize AcquisitionFrameRate enabling, setting and readbacks (logs many related nodes and records actual_fps). Initializes a WorkerTimingStats instance (controlled by SINGLE_CAMERA_WORKER_DO_LOG_TIMING) and wraps RetrieveResult/convert/get array/release steps with timing measurements, improved error handling, proper grab_result release on exceptions, and frame counting/logging. Overall improves observability and robustness when setting frame rates and reading frames from Basler cameras.

Introduce a separate, throttled UI/display path for multi-camera frames. Add GUI_MAX_DISPLAY_FPS config and a new display_ready signal that is emitted at most at that rate, while frame_ready remains full-rate for recording/inference. Implement _should_emit_display_ready, wire the MultiCameraController to emit both signals, and reset throttling state when starting. Update the main window to handle processing and display paths via _on_multi_frame_processing_ready and _on_multi_frame_display_ready, and adjust tests accordingly. Also add GUI/debug timing config keys and a temporary timing-only early path in SingleCameraWorker (marked as FIXME).

Add helpers and telemetry to better read and debug GenTL/GenICam cameras.

- New debug helper _debug_frame_rate_nodes to log many common frame-rate/exposure/throughput nodes.
- Added robust node accessors: _node_value, _node_float, _node_str to safely read various GenICam node types and try multiple node names.
- Enhance frame-rate configuration to log before/after values when enabling rate control and when setting AcquisitionFrameRate/AcquisitionFrameRateAbs; record any accepted frame-rate as _actual_fps.
- After starting acquisition, attempt to read telemetry and run FPS debug logging; warn (but continue) if telemetry read fails.
- Improve _read_telemetry to prefer resulting frame-rate nodes over requested ones, and to populate actual_fps, actual_exposure, actual_gain and other useful properties (pixel format, throughput, resolution, etc.) into the settings namespace for GUI/debugging.

These changes make frame-rate/exposure behavior more observable and more tolerant across different camera implementations.

Fix signal hookup and disable main-window timing flag. Replace the second connection of multi_camera_controller.frame_ready to _on_multi_frame_display_ready with multi_camera_controller.display_ready to separate processing-ready and display-ready events. Also comment out MAIN_WINDOW_DO_LOG_TIMING in config.py to disable main-window timing logging.

Change LOG.info to LOG.debug to reduce noise when printing node information. Add an allow_zero parameter to _node_float so callers can accept zero as a valid value (previously only positive values were returned). Update callers for exposure, gain, and DeviceLinkThroughputLimit to pass allow_zero=True so reported zeros are treated as real readings while preserving the original behavior by default.