feat: Enrich DTOs and UI to display member names instead of UUIDs for task assignees, creators, and shift signups.

openspec/changes/replace-uuids-with-names/proposal.md

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+## Why
+
+Currently, the frontend displays raw UUIDs for user references (assignee, creator, members) which creates a poor user experience. Users should see meaningful names like "Alice Smith" instead of "a1b2c3d4-e5f6-7890-abcd-ef1234567890". The backend already stores display names in the Member entity, but the API DTOs don't expose them.
+
+## What Changes
+
+- **Backend DTOs**: Add name fields to task and shift DTOs
+  - `TaskListItemDto`: Add `string? AssigneeName`
+  - `TaskDetailDto`: Add `string? AssigneeName` and `string CreatedByName`
+  - `ShiftSignupDto`: Add `string MemberName`
+- **Backend Services**: Update TaskService and ShiftService to query and populate member names
+  - Join with Members table to fetch display names
+  - Include names in DTO construction
+- **Frontend Types**: Update TypeScript interfaces to include new name fields
+  - `TaskListItemDto`, `TaskDetailDto`, `ShiftSignupDto` interfaces
+- **Frontend UI**: Replace UUID displays with names
+  - Task list: show assignee name instead of ID
+  - Task detail: show assignee and creator names
+  - Shift detail: show member names in signup list
+
+## Capabilities
+
+### New Capabilities
+- `member-name-enrichment`: API DTOs include human-readable member names alongside IDs
+
+### Modified Capabilities
+- None (this is purely an enhancement to existing capabilities)
+
+## Impact
+
+- **Backend**: TaskService.cs, ShiftService.cs, and DTOs in WorkClub.Application
+- **Frontend**: Tasks pages, Shifts pages, and React hooks (useTasks.ts, useShifts.ts)
+- **Database**: Additional JOIN queries on Members table (no schema changes)
+- **API Response**: New optional fields in existing endpoints (backward compatible)