fix: add sans-serif font fallback to fontFamily (Fixes #37096)

[dheeraj12347]

This fix adds sans-serif as a generic font fallback to ensure consistent
sans-serif rendering when preferred fonts (Inter, Helvetica, Arial) are not available.

Previously, when none of the specified fonts were available, browsers would default
to serif fonts, causing inconsistent visuals in dashboard reports and screenshots.

Changes:

• Updated fontFamily in superset/config.py from "Inter, Helvetica, Arial" to "Inter, Helvetica, Arial, sans-serif"

Fixes #37096

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[dheeraj12347]

This PR adds a generic sans-serif fallback to THEME_DEFAULT.fontFamily so if Inter/Helvetica/Arial are missing, the browser still uses a sans-serif font instead of a serif fallback. This keeps dashboards and screenshots visually consistent across environments.