CUB-46: Implement Quick‑Jump Button Component

backend/ControlCenter.Api.csproj

@@ -13,7 +13,6 @@
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
     <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="9.0.4" />
-    <PackageReference Include="Swashbuckle.AspNetCore" Version="10.1.7" />
   </ItemGroup>
 
 </Project>

backend/Program.cs

@@ -0,0 +1,38 @@
+using ControlCenter.Api.Data;
+using ControlCenter.Api.Hubs;
+using Microsoft.EntityFrameworkCore;
+
+var builder = WebApplication.CreateBuilder(args);
+
+// Add services to the container.
+builder.Services.AddOpenApi();
+
+// Register SignalR for real-time agent status updates
+builder.Services.AddSignalR();
+
+// Register DbContext with PostgreSQL
+builder.Services.AddDbContext<AppDbContext>(options =>
+{
+    var connectionString = builder.Configuration.GetConnectionString("DefaultConnection")
+        ?? "Host=localhost;Database=control_center;Username=postgres;Password=postgres";
+
+    options.UseNpgsql(connectionString, npgsqlOptions =>
+    {
+        npgsqlOptions.MigrationsAssembly(typeof(AppDbContext).Assembly.FullName);
+    });
+});
+
+var app = builder.Build();
+
+// Configure the HTTP request pipeline.
+if (app.Environment.IsDevelopment())
+{
+    app.MapOpenApi();
+}
+
+app.UseHttpsRedirection();
+
+// Map SignalR hubs
+app.MapHub<AgentStatusHub>("/hubs/agent-status");
+
+app.Run();

frontend/src/app/components/index.ts

@@ -0,0 +1 @@
+export * from './quick-jump-button/quick-jump-button.component';

frontend/src/app/components/quick-jump-button/quick-jump-button.component.html

@@ -0,0 +1,8 @@
+<button
+  mat-icon-button
+  class="quick-jump-button"
+  [attr.aria-label]="'Jump to agent session'"
+  (click)="onJumpClick()"
+>
+  <mat-icon>arrow_forward</mat-icon>
+</button>

frontend/src/app/components/quick-jump-button/quick-jump-button.component.scss

@@ -0,0 +1,68 @@
+// ============================================================================
+// Quick-Jump Button — M3 FilledTonalIconButton
+// Per spec Section 7.3: Agent Card Quick-Jump action
+// M3 spec: FilledTonalIconButton uses secondary container color
+// with 8% state layer overlay for hover/focus.
+// ============================================================================
+
+.quick-jump-button {
+  // M3 FilledTonalIconButton: secondary-container background
+  // Angular Material mat-icon-button sets up the base shape (40x40, round).
+  // We override the color tokens to match FilledTonal style.
+  --mdc-icon-button-icon-color: var(--mat-sys-on-secondary-container);
+  background-color: var(--mat-sys-secondary-container);
+  border-radius: 50%;
+  transition: background-color 150ms cubic-bezier(0.4, 0, 0.2, 1);
+
+  // M3 State Layer: 8% overlay on hover
+  &:hover {
+    background-color: var(--mat-sys-secondary-container);
+    // State layer overlay using a pseudo-element for precise 8% opacity
+    &::after {
+      content: '';
+      position: absolute;
+      inset: 0;
+      border-radius: 50%;
+      background-color: var(--mat-sys-on-secondary-container);
+      opacity: 0.08;
+      pointer-events: none;
+    }
+  }
+
+  // M3 State Layer: 12% overlay on focus-visible (slightly stronger for accessibility)
+  &:focus-visible {
+    background-color: var(--mat-sys-secondary-container);
+    outline: 3px solid var(--status-active);
+    outline-offset: 2px;
+
+    &::after {
+      content: '';
+      position: absolute;
+      inset: 0;
+      border-radius: 50%;
+      background-color: var(--mat-sys-on-secondary-container);
+      opacity: 0.12;
+      pointer-events: none;
+    }
+  }
+
+  // M3 State Layer: 12% overlay on active/pressed
+  &:active {
+    background-color: var(--mat-sys-secondary-container);
+
+    &::after {
+      content: '';
+      position: absolute;
+      inset: 0;
+      border-radius: 50%;
+      background-color: var(--mat-sys-on-secondary-container);
+      opacity: 0.12;
+      pointer-events: none;
+    }
+  }
+
+  // Icon color stays on-secondary-container across all states
+  .mat-icon {
+    color: var(--mat-sys-on-secondary-container);
+  }
+}

frontend/src/app/components/quick-jump-button/quick-jump-button.component.ts

@@ -0,0 +1,32 @@
+import { ChangeDetectionStrategy, Component, EventEmitter, Output } from '@angular/core';
+import { MatIconButton } from '@angular/material/button';
+import { MatIcon } from '@angular/material/icon';
+
+/**
+ * Quick-Jump Button — M3 FilledTonalIconButton
+ *
+ * An icon button that emits a navigation event for jumping to an agent session.
+ * Uses the Material Design 3 FilledTonalIconButton style with 8% state layer
+ * overlay on hover and focus.
+ *
+ * Per spec Section 7.3: Agent Card Component Interface
+ */
+@Component({
+  selector: 'app-quick-jump-button',
+  standalone: true,
+  imports: [MatIconButton, MatIcon],
+  templateUrl: './quick-jump-button.component.html',
+  styleUrl: './quick-jump-button.component.scss',
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class QuickJumpButtonComponent {
+  /** Emitted when the button is clicked, carrying the session key for navigation. */
+  @Output() jumpClick = new EventEmitter<string>();
+
+  /** The session key to navigate to. Set by the parent agent card. */
+  sessionKey = '';
+
+  onJumpClick(): void {
+    this.jumpClick.emit(this.sessionKey);
+  }
+}