AI-powered assignment generation with enriched data and streaming UI

- Add aiPreview mutation with full project/juror data (bios, descriptions,
  documents, categories, ocean issues, countries, team sizes)
- Increase AI description limit from 300 to 2000 chars for richer context
- Update GPT system prompt to use all available data fields
- Add mode toggle (AI default / Algorithm fallback) in assignment preview
- Lift AI mutation to parent page for background generation persistence
- Show visual indicator on page while AI generates (spinner + progress card)
- Toast notification with "Review" action when AI completes
- Staggered reveal animation for assignment results (streaming feel)
- Fix assignment balance with dynamic penalty (25pts per existing assignment)

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

src/server/services/anonymization.ts

@@ -21,7 +21,7 @@ import type {
 // ─── Description Limits ──────────────────────────────────────────────────────
 
 export const DESCRIPTION_LIMITS = {
-  ASSIGNMENT: 300,
+  ASSIGNMENT: 2000,
   FILTERING: 500,
   ELIGIBILITY: 400,
   MENTOR: 350,
@@ -46,6 +46,8 @@ export interface AnonymizedJuror {
   expertiseTags: string[]
   currentAssignmentCount: number
   maxAssignments: number | null
+  bio?: string | null
+  country?: string | null
 }
 
 export interface AnonymizedProject {
@@ -54,6 +56,12 @@ export interface AnonymizedProject {
   description: string | null
   tags: Array<{ name: string; confidence: number }>
   teamName: string | null
+  category?: string | null
+  oceanIssue?: string | null
+  country?: string | null
+  institution?: string | null
+  teamSize?: number
+  fileTypes?: string[]
 }
 
 export interface JurorMapping {
@@ -200,6 +208,8 @@ interface JurorInput {
   name?: string | null
   email: string
   expertiseTags: string[]
+  bio?: string | null
+  country?: string | null
   maxAssignments?: number | null
   _count?: {
     assignments: number
@@ -213,6 +223,12 @@ interface ProjectInput {
   tags: string[]
   tagConfidences?: Array<{ name: string; confidence: number }>
   teamName?: string | null
+  competitionCategory?: string | null
+  oceanIssue?: string | null
+  country?: string | null
+  institution?: string | null
+  teamSize?: number
+  fileTypes?: string[]
 }
 
 /**
@@ -238,6 +254,8 @@ export function anonymizeForAI(
       expertiseTags: juror.expertiseTags,
       currentAssignmentCount: juror._count?.assignments ?? 0,
       maxAssignments: juror.maxAssignments ?? null,
+      bio: juror.bio ? truncateAndSanitize(juror.bio, 500) : null,
+      country: juror.country ?? null,
     }
   })
 
@@ -260,6 +278,12 @@ export function anonymizeForAI(
           ? project.tagConfidences
           : project.tags.map((t) => ({ name: t, confidence: 1.0 })),
         teamName: project.teamName ? `Team ${index + 1}` : null,
+        category: project.competitionCategory ?? null,
+        oceanIssue: project.oceanIssue ?? null,
+        country: project.country ?? null,
+        institution: project.institution ? sanitizeText(project.institution) : null,
+        teamSize: project.teamSize,
+        fileTypes: project.fileTypes,
       }
     }
   )