feat(server): adopt zod DTOs for the day-note body contracts

shared/src/day/day.schema.spec.ts

@@ -21,6 +21,10 @@ describe('dayNoteCreateRequestSchema', () => {
       }).success,
     ).toBe(false);
   });
+
+  it('accepts null time/icon (moveDayNote re-sends the nullable entity fields)', () => {
+    expect(dayNoteCreateRequestSchema.safeParse({ text: 'ok', time: null, icon: null }).success).toBe(true);
+  });
 });
 
 describe('dayNoteUpdateRequestSchema', () => {
@@ -29,4 +33,8 @@ describe('dayNoteUpdateRequestSchema', () => {
     expect(dayNoteUpdateRequestSchema.safeParse({ icon: '🍽️' }).success).toBe(true);
     expect(dayNoteUpdateRequestSchema.safeParse({ text: 'x'.repeat(501) }).success).toBe(false);
   });
+
+  it('accepts an explicit null time (clears the label)', () => {
+    expect(dayNoteUpdateRequestSchema.safeParse({ time: null }).success).toBe(true);
+  });
 });

shared/src/day/day.schema.ts

@@ -68,18 +68,21 @@ export const dayUpdateRequestSchema = z.object({
 });
 export type DayUpdateRequest = z.infer<typeof dayUpdateRequestSchema>;
 
+// `time`/`icon` accept null on the wire: the client's moveDayNote re-sends the
+// entity fields (both nullable on dayNoteSchema) through create, and an explicit
+// null time on update means "clear" (the legacy raw-body route accepted both).
 export const dayNoteCreateRequestSchema = z.object({
   text: z.string().min(1).max(500),
-  time: z.string().max(250).optional(),
-  icon: z.string().optional(),
+  time: z.string().max(250).nullable().optional(),
+  icon: z.string().nullable().optional(),
   sort_order: z.number().optional(),
 });
 export type DayNoteCreateRequest = z.infer<typeof dayNoteCreateRequestSchema>;
 
 export const dayNoteUpdateRequestSchema = z.object({
   text: z.string().max(500).optional(),
-  time: z.string().max(250).optional(),
-  icon: z.string().optional(),
+  time: z.string().max(250).nullable().optional(),
+  icon: z.string().nullable().optional(),
   sort_order: z.number().optional(),
 });
 export type DayNoteUpdateRequest = z.infer<typeof dayNoteUpdateRequestSchema>;