Rename hasPluginStatus/hasPluginOrder locals to hasGearStatus/hasGearOrder

[Copilot]

Local variable names in shouldHideSidebar still used Plugin terminology after the broader rename to Gear, creating an inconsistency with the functions they capture results from.

Changes

• base.templ: Renamed hasPluginStatus/hasPluginOrder → hasGearStatus/hasGearOrder

// Before
_, hasPluginStatus := auth.GetGearStatusFromContext(ctx)
_, hasPluginOrder  := auth.GetGearOrderFromContext(ctx)
return !hasPluginStatus && !hasPluginOrder

// After
_, hasGearStatus := auth.GetGearStatusFromContext(ctx)
_, hasGearOrder  := auth.GetGearOrderFromContext(ctx)
return !hasGearStatus && !hasGearOrder

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