feat(ui): filter freight/stages by current warehouse filters

[jessesuen]

Companion PR to #6153

This improves UI performance by sending the currently selected warehouse filters to the backend, reducing the response payload so the UI does not have to handle as many objects.

@rpelczar, please feel free to discard this or take it over; it was entirely vibecoded, and I just created it to prove that #6153 would help with the UI performance.

What changed:

The UI's queryFreight and listStages calls now pass the active warehouse filter (origins / freightOrigins) as query parameters, so the server-side filter applies to the initial data fetch — not just the display.

The stage/freight watchers are also updated to respect the active filter:

• Watcher.watchStages now accepts an optional warehouses array and passes it as freightOrigins to the watch stream, so live stage updates are scoped to the filtered warehouses. The ListStagesRequest input used for cache key lookups is constructed once with the filter and reused.
• useEventsWatcher (used by both graph and list views) accepts and forwards the warehouses filter to watchStages, and includes the warehouse list in its useEffect dependency array so the watcher restarts when the filter changes.
• useWatchFreight fixes a bug where deleting Freight while a warehouse filter was active didn't update the UI: DELETED events now use setQueriesData with exact: false to remove the freight from all queryFreight cache entries (both unfiltered and warehouse-filtered), rather than only the unfiltered one.
• In pipelines.tsx, the preferredFilter store is read before the queries are declared so the filter values are available to pass into both queryFreight and listStages.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.69%. Comparing base (596be3d) to head (ed5d870).

Additional details and impacted files

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##             main    #6161   +/-   ##
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  Coverage   57.69%   57.69%           
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  Files         474      474           
  Lines       40499    40499           
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  Hits        23365    23365           
  Misses      15739    15739           
  Partials     1395     1395           

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