feat: add delete functionality for exercises and routines

src/ASTRAIN.Api/Endpoints/ExerciseEndpoints.cs

@@ -79,6 +79,23 @@ internal static class ExerciseEndpoints
             .WithSummary("Update exercise")
             .WithDescription("Updates the name of an exercise for the specified user.");
 
+        group.MapDelete("/users/{userId}/exercises/{exerciseId:int}", async (string userId, int exerciseId, AppDbContext db) =>
+            {
+                var user = await UserProvisioning.EnsureUserAsync(db, userId);
+                var exercise = await db.Exercises.FirstOrDefaultAsync(e => e.Id == exerciseId && e.UserId == user.Id);
+                if (exercise is null)
+                {
+                    return Results.NotFound();
+                }
+
+                db.Exercises.Remove(exercise);
+                await db.SaveChangesAsync();
+
+                return Results.NoContent();
+            })
+            .WithSummary("Delete exercise")
+            .WithDescription("Deletes an exercise for the specified user.");
+
         return group;
     }
 }

src/ASTRAIN.Api/Endpoints/RoutineEndpoints.cs

@@ -160,6 +160,23 @@ internal static class RoutineEndpoints
             .WithSummary("Update routine")
             .WithDescription("Updates routine metadata and exercise ordering.");
 
+        group.MapDelete("/users/{userId}/routines/{routineId:int}", async (string userId, int routineId, AppDbContext db) =>
+            {
+                var user = await UserProvisioning.EnsureUserAsync(db, userId);
+                var routine = await db.Routines.FirstOrDefaultAsync(r => r.Id == routineId && r.UserId == user.Id);
+                if (routine is null)
+                {
+                    return Results.NotFound();
+                }
+
+                db.Routines.Remove(routine);
+                await db.SaveChangesAsync();
+
+                return Results.NoContent();
+            })
+            .WithSummary("Delete routine")
+            .WithDescription("Deletes a routine and its associated data for the specified user.");
+
         return group;
     }
 }

src/ASTRAIN.Client/Pages/Exercises.razor

@@ -50,7 +50,10 @@
                         else
                         {
                             <div class="item-title">@exercise.Name</div>
-                            <button class="ghost" @onclick="() => StartEdit(exercise)">Edit</button>
+                            <div class="actions">
+                                <button class="ghost" @onclick="() => StartEdit(exercise)" aria-label="Edit exercise">✏️</button>
+                                <button class="ghost" @onclick="() => DeleteExerciseAsync(exercise.Id)" aria-label="Delete exercise">🗑️</button>
+                            </div>
                         }
                     </div>
                 }
@@ -148,4 +151,10 @@
 
         CancelEdit();
     }
+
+    private async Task DeleteExerciseAsync(int exerciseId)
+    {
+        await Api.DeleteExerciseAsync(UserContext.UserId, exerciseId);
+        ExerciseList.RemoveAll(e => e.Id == exerciseId);
+    }
 }

src/ASTRAIN.Client/Pages/Routines.razor

@@ -25,6 +25,8 @@
             </section>
         }
 
+        @if (EditingRoutine is null)
+        {
             @if (ShowCreateRoutine)
             {
                 <section class="card">
@@ -43,6 +45,8 @@
                 </section>
             }
 
+            @if (ExerciseList.Count > 0 || RoutineList.Count > 0)
+            {
                 <section class="card">
                     <h2>Your Routines</h2>
                     @if (IsLoading)
@@ -64,7 +68,8 @@
                                         <div class="item-subtitle">@string.Join(" · ", routine.Exercises.Select(e => e.Name))</div>
                                     </div>
                                     <div class="actions">
-                                <button class="ghost" @onclick="() => StartEdit(routine)">Edit</button>
+                                        <button class="ghost" @onclick="() => StartEdit(routine)" aria-label="Edit routine">✏️</button>
+                                        <button class="ghost" @onclick="() => DeleteRoutineAsync(routine.Id)" aria-label="Delete routine">🗑️</button>
                                         <button class="primary" @onclick="() => StartRun(routine)">Start</button>
                                     </div>
                                 </div>
@@ -72,6 +77,8 @@
                         </div>
                     }
                 </section>
+            }
+        }
 
         @if (EditingRoutine is not null)
         {
@@ -246,6 +253,12 @@
         CancelEdit();
     }
 
+    private async Task DeleteRoutineAsync(int routineId)
+    {
+        await Api.DeleteRoutineAsync(UserContext.UserId, routineId);
+        RoutineList.RemoveAll(r => r.Id == routineId);
+    }
+
     private async Task StartRun(RoutineDto routine)
     {
         ActiveRun = routine;

src/ASTRAIN.Client/Services/ApiClient.cs

@@ -37,6 +37,11 @@ public class ApiClient
         return await response.Content.ReadFromJsonAsync<ExerciseDto>();
     }
 
+    public async Task DeleteExerciseAsync(string userId, int exerciseId)
+    {
+        await _http.DeleteAsync($"/api/users/{userId}/exercises/{exerciseId}");
+    }
+
     public async Task<List<RoutineDto>> GetRoutinesAsync(string userId)
     {
         return await _http.GetFromJsonAsync<List<RoutineDto>>($"/api/users/{userId}/routines") ?? new List<RoutineDto>();
@@ -59,6 +64,11 @@ public class ApiClient
         return await response.Content.ReadFromJsonAsync<RoutineDto>();
     }
 
+    public async Task DeleteRoutineAsync(string userId, int routineId)
+    {
+        await _http.DeleteAsync($"/api/users/{userId}/routines/{routineId}");
+    }
+
     public async Task<RoutineRunSummaryDto> GetLastRunAsync(string userId, int routineId)
     {
         return await _http.GetFromJsonAsync<RoutineRunSummaryDto>($"/api/users/{userId}/routines/{routineId}/last-run")