UI/UX audit fixes: clickable pipelines, broken links, isActive locking

- Make pipeline cards clickable on list page (navigate to detail view)
- Fix broken nav link: applicant /messages → /mentor
- Fix broken nav link: mentor /messages → /projects
- Add isActive field locking to all 7 wizard sections (intake, main-track,
  filtering, assignment, awards, live-finals, notifications)
- Add minLoad ≤ maxLoad cross-field validation in assignment section
- Add duplicate stage slug detection in main track section
- Add active pipeline warning banners in intake and main track sections

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/admin/pipeline/sections/live-finals-section.tsx

@@ -15,9 +15,10 @@ import type { LiveFinalConfig } from '@/types/pipeline-wizard'
 type LiveFinalsSectionProps = {
   config: LiveFinalConfig
   onChange: (config: LiveFinalConfig) => void
+  isActive?: boolean
 }
 
-export function LiveFinalsSection({ config, onChange }: LiveFinalsSectionProps) {
+export function LiveFinalsSection({ config, onChange, isActive }: LiveFinalsSectionProps) {
   const updateConfig = (updates: Partial<LiveFinalConfig>) => {
     onChange({ ...config, ...updates })
   }
@@ -36,6 +37,7 @@ export function LiveFinalsSection({ config, onChange }: LiveFinalsSectionProps)
           onCheckedChange={(checked) =>
             updateConfig({ juryVotingEnabled: checked })
           }
+          disabled={isActive}
         />
       </div>
 
@@ -52,6 +54,7 @@ export function LiveFinalsSection({ config, onChange }: LiveFinalsSectionProps)
             onCheckedChange={(checked) =>
               updateConfig({ audienceVotingEnabled: checked })
             }
+            disabled={isActive}
           />
         </div>
 
@@ -91,6 +94,7 @@ export function LiveFinalsSection({ config, onChange }: LiveFinalsSectionProps)
               cohortSetupMode: value as LiveFinalConfig['cohortSetupMode'],
             })
           }
+          disabled={isActive}
         >
           <SelectTrigger>
             <SelectValue />
@@ -115,6 +119,7 @@ export function LiveFinalsSection({ config, onChange }: LiveFinalsSectionProps)
               revealPolicy: value as LiveFinalConfig['revealPolicy'],
             })
           }
+          disabled={isActive}
         >
           <SelectTrigger>
             <SelectValue />