fix: address #200, #201: Location handling on the Loads page

[t-kramer]

The location (city, climate zone, CA climate region and grid region) can come from the selected load profile or from the optional location search. The two paths behaved differently and could get out of sync. This PR makes the behaviour consistent.

Behaviour

• A manual location stays fixed until cleared. Changing the load profile keeps a location picked in the search. Clearing the search goes back to the load profile's location.
• A location change always updates all fields together: city, ASHRAE climate zone, climate region display (with "CA Region N" for California) and grid region.
• The override is saved with the session, not read from the dropdown. It survives leaving and coming back to the page, and the dropdown shows the saved location again.
• A custom upload clears the location unless one was set manually, and the user is asked to pick one.

I also added a small one-liner below to the search bar to indicate the current status. See different cases in screenshots down below.

Data

• building_metadata.csv: new ca_climate_zone column for all California buildings. DEER buildings use the CEC reference cities, and Los Angeles uses CZ9 (downtown) @jiwonpark-HVAC Important for the next load library update!!
• locations.csv: San Francisco climate zone corrected from 4C to 3C.

UI

• The search description is down to one sentence. The rest is a hover tooltip.
• A short note under the search shows the source: "Location based on load profile", or "Location manually adjusted to X ✓" in green. An orange warning appears when there's no grid region.

Note

If building_metadata.csv is generated by an external pipeline, the ca_climate_zone column has to be added there too.

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[urwahah]

your solution looks good to me! the only thing i'm not seeing when i run it is your note about the override being saved with the session. if i override the location, then return to the loads page, the location seems to reset to the load metadata default.

[t-kramer]

your solution looks good to me! the only thing i'm not seeing when i run it is your note about the override being saved with the session. if i override the location, then return to the loads page, the location seems to reset to the load metadata default.

@urwahah Oooops, forgot to stage the last changes and commit. Just updated the PR, should be complete now!