feat(06-01): migrate categories from emoji to Lucide icon field

- Rename emoji column to icon in schema, Zod schemas, and all services
- Add Drizzle migration with emoji-to-icon data conversion
- Update test helper, seed, and all test files for icon field
- All 87 tests pass with new icon-based schema

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

src/server/services/category.service.ts

@@ -10,13 +10,13 @@ export function getAllCategories(db: Db = prodDb) {
 
 export function createCategory(
   db: Db = prodDb,
-  data: { name: string; emoji?: string },
+  data: { name: string; icon?: string },
 ) {
   return db
     .insert(categories)
     .values({
       name: data.name,
-      ...(data.emoji ? { emoji: data.emoji } : {}),
+      ...(data.icon ? { icon: data.icon } : {}),
     })
     .returning()
     .get();
@@ -25,7 +25,7 @@ export function createCategory(
 export function updateCategory(
   db: Db = prodDb,
   id: number,
-  data: { name?: string; emoji?: string },
+  data: { name?: string; icon?: string },
 ) {
   const existing = db
     .select({ id: categories.id })

src/server/services/item.service.ts

@@ -19,7 +19,7 @@ export function getAllItems(db: Db = prodDb) {
       createdAt: items.createdAt,
       updatedAt: items.updatedAt,
       categoryName: categories.name,
-      categoryEmoji: categories.emoji,
+      categoryIcon: categories.icon,
     })
     .from(items)
     .innerJoin(categories, eq(items.categoryId, categories.id))

src/server/services/setup.service.ts

@@ -57,7 +57,7 @@ export function getSetupWithItems(db: Db = prodDb, setupId: number) {
       createdAt: items.createdAt,
       updatedAt: items.updatedAt,
       categoryName: categories.name,
-      categoryEmoji: categories.emoji,
+      categoryIcon: categories.icon,
     })
     .from(setupItems)
     .innerJoin(items, eq(setupItems.itemId, items.id))

src/server/services/thread.service.ts

@@ -22,7 +22,7 @@ export function getAllThreads(db: Db = prodDb, includeResolved = false) {
       resolvedCandidateId: threads.resolvedCandidateId,
       categoryId: threads.categoryId,
       categoryName: categories.name,
-      categoryEmoji: categories.emoji,
+      categoryIcon: categories.icon,
       createdAt: threads.createdAt,
       updatedAt: threads.updatedAt,
       candidateCount: sql<number>`(
@@ -67,7 +67,7 @@ export function getThreadWithCandidates(db: Db = prodDb, threadId: number) {
       createdAt: threadCandidates.createdAt,
       updatedAt: threadCandidates.updatedAt,
       categoryName: categories.name,
-      categoryEmoji: categories.emoji,
+      categoryIcon: categories.icon,
     })
     .from(threadCandidates)
     .innerJoin(categories, eq(threadCandidates.categoryId, categories.id))

src/server/services/totals.service.ts

@@ -9,7 +9,7 @@ export function getCategoryTotals(db: Db = prodDb) {
     .select({
       categoryId: items.categoryId,
       categoryName: categories.name,
-      categoryEmoji: categories.emoji,
+      categoryIcon: categories.icon,
       totalWeight: sql<number>`COALESCE(SUM(${items.weightGrams}), 0)`,
       totalCost: sql<number>`COALESCE(SUM(${items.priceCents}), 0)`,
       itemCount: sql<number>`COUNT(*)`,