fix: migrate 11 remaining files missed by component sweep

editor-ai, guides, maintenance, scripts, settings, NavItem,
and dashboard active-glow removal.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/session/SessionFilters.tsx

@@ -227,7 +227,7 @@ export function SessionFilters({ filters, onChange, onClear, trees }: SessionFil
                     setShowDatePicker(false)
                   }}
                   className={cn(
-                    'flex-1 rounded-md bg-gradient-brand px-3 py-1.5 text-sm font-medium text-white shadow-lg shadow-primary/20',
+                    'flex-1 rounded-md bg-[#22d3ee] px-3 py-1.5 text-sm font-medium text-white',
                     'hover:brightness-110'
                   )}
                 >