GridCliqueIt

Reduced unnecessary UNIT_HEALTH processing by ignoring unrelated units and repeated health values.
Improved tooltip health updates so they only refresh when the tooltip is visible for the affected unit.
Added safer unit validation before click-cast actions.
Improved first-run behavior when no click-cast skills are configured yet.
Clicking unit frames with no valid configured spell now safely does nothing.
Improved buff/debuff tooltip handling for missing or inactive aura timers.