The Dashboard Properties modal seeds a separate refreshFrequency state from the
Refresh dropdown and, on save, unconditionally overwrote
json_metadata.refresh_frequency with it, so a value typed directly into the
Advanced JSON editor was clobbered by the (stale) dropdown value and reset to 0.
This mirrors how color_scheme is already handled: the JSON editor value now
takes precedence on save, and a dropdown change syncs back into the JSON so the
two sources can't diverge.
Also hardens DashboardDAO.set_dash_metadata so metadata fields absent from the
incoming payload are preserved instead of reset to their defaults (the pattern
dosu flagged on the issue), preventing partial updates from wiping unrelated
fields.
Fixes#42116
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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