Add visual progress indicator for AI assignment batches

- Add AssignmentJob model to track AI assignment progress
- Create startAIAssignmentJob mutation for background processing
- Add getAIAssignmentJobStatus query for polling progress
- Update AI assignment service with progress callback support
- Add progress bar UI showing batch/project processing status
- Add toast notifications for job completion/failure
- Add AI_SUGGESTIONS_READY notification type

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/server/services/ai-assignment.ts

@@ -86,6 +86,15 @@ interface AssignmentConstraints {
   }>
 }
 
+export interface AssignmentProgressCallback {
+  (progress: {
+    currentBatch: number
+    totalBatches: number
+    processedCount: number
+    totalProjects: number
+  }): Promise<void>
+}
+
 // ─── AI Processing ───────────────────────────────────────────────────────────
 
 /**
@@ -247,7 +256,8 @@ export async function generateAIAssignments(
   projects: ProjectForAssignment[],
   constraints: AssignmentConstraints,
   userId?: string,
-  entityId?: string
+  entityId?: string,
+  onProgress?: AssignmentProgressCallback
 ): Promise<AIAssignmentResult> {
   // Truncate descriptions before anonymization
   const truncatedProjects = projects.map((p) => ({
@@ -279,11 +289,14 @@ export async function generateAIAssignments(
     let totalTokens = 0
 
     // Process projects in batches
+    const totalBatches = Math.ceil(anonymizedData.projects.length / ASSIGNMENT_BATCH_SIZE)
+
     for (let i = 0; i < anonymizedData.projects.length; i += ASSIGNMENT_BATCH_SIZE) {
       const batchProjects = anonymizedData.projects.slice(i, i + ASSIGNMENT_BATCH_SIZE)
       const batchMappings = anonymizedData.projectMappings.slice(i, i + ASSIGNMENT_BATCH_SIZE)
+      const currentBatch = Math.floor(i / ASSIGNMENT_BATCH_SIZE) + 1
 
-      console.log(`[AI Assignment] Processing batch ${Math.floor(i / ASSIGNMENT_BATCH_SIZE) + 1}/${Math.ceil(anonymizedData.projects.length / ASSIGNMENT_BATCH_SIZE)}`)
+      console.log(`[AI Assignment] Processing batch ${currentBatch}/${totalBatches}`)
 
       const { suggestions, tokensUsed } = await processAssignmentBatch(
         openai,
@@ -298,6 +311,17 @@ export async function generateAIAssignments(
 
       allSuggestions.push(...suggestions)
       totalTokens += tokensUsed
+
+      // Report progress after each batch
+      if (onProgress) {
+        const processedCount = Math.min((currentBatch) * ASSIGNMENT_BATCH_SIZE, projects.length)
+        await onProgress({
+          currentBatch,
+          totalBatches,
+          processedCount,
+          totalProjects: projects.length,
+        })
+      }
     }
 
     console.log(`[AI Assignment] Completed. Total suggestions: ${allSuggestions.length}, Total tokens: ${totalTokens}`)