Add square footage total to data summary page enhancement

[LaurenKerrNREL]

Any background context you want to provide?

Enhancement for SEED biannual statistics, current work requires a manual process to get square footage by exporting and summing the square footage column manually. This work automates that by providing the sum of square footage in the summary table.

What's this PR do?

Adds sum of square footage to the summary table

How should this be manually tested?

We used test buildings with square footage, exported the data from inventory and summed the square footage field then compared it to the square footage sum in the summary table. Both values matched. We may want to test in the same way for a live organization instance once merged to develop.

What are the relevant tickets?

None, request from Nicholas by way of conversation and teams during ideation around improvements to biannual stats process

Screenshots (if appropriate)

NA

[Copilot]

Pull Request Overview

This pull request adds a "Total Square Feet" metric to the inventory summary dashboard by calculating the sum of gross floor areas from property states and displaying it in the summary grid.

• Adds backend calculation for total square footage from gross_floor_area field
• Updates frontend summary grid to display the new metric alongside existing statistics
• Changes the column header from "Count" to "Value" to better reflect the mixed data types now displayed

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
seed/views/v3/analyses.py	Adds query to fetch gross_floor_area values and calculates total_sqft for the stats endpoint response
seed/static/seed/js/controllers/inventory_summary_controller.js	Updates summary grid to include Total Square Feet row and renames column header from "Count" to "Value"

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