Replaces the per-row JSON textbox with an Edit button that opens a modal
hosting the full AlarmTriggerEditor. The editor pre-populates with the
merged inherited + override config so the operator sees the effective
state, not the override delta.
On Save:
- HiLo: diff against inherited, store only changed keys
- Binary trigger types: whole-replace if the edited config differs
Value comparison in the diff is type-aware (decoded strings, numeric
GetDouble) so JSON-escape differences (e.g., literal em-dash vs —)
don't produce false-positive diffs that pollute the override JSON.
FlatteningService.MergeHiLoConfig is now public so the UI can pre-merge
the editor seed; new public DiffHiLoConfig handles the symmetric
direction. +2 encoding tests cover the new equivalence behavior.
The override row's summary column shows the diff'd keys + priority chip
so operators see what's overridden at a glance.
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