feat: add floating btn

src/app/components/floating-big-btn/floating-big-btn.html

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+  <mat-toolbar>
+    <button matIconButton>
+      <mat-icon>{{icon()}}</mat-icon>
+    </button>
+  </mat-toolbar>

src/app/components/floating-big-btn/floating-big-btn.scss

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+mat-toolbar {
+  position: absolute;
+  bottom: 80px;
+  left: 75%;
+  display: block;
+
+  button {
+    background: var(--mat-sys-primary-container);
+    width: 64px;
+    height: 64px;
+    mat-icon {
+      font-size: 48px;
+      width: 48px;
+      height: 48px;
+      color: white;
+    }
+  }
+
+  mat-icon {
+    color: white;
+  }
+}

src/app/components/floating-big-btn/floating-big-btn.spec.ts

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+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { FloatingBigBtn } from './floating-big-btn';
+
+describe('FloatingBigBtn', () => {
+  let component: FloatingBigBtn;
+  let fixture: ComponentFixture<FloatingBigBtn>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [FloatingBigBtn]
+    })
+    .compileComponents();
+
+    fixture = TestBed.createComponent(FloatingBigBtn);
+    component = fixture.componentInstance;
+    await fixture.whenStable();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/components/floating-big-btn/floating-big-btn.ts

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+import { Component, input, output } from '@angular/core';
+import { MatIconButton } from '@angular/material/button';
+import { MatIcon } from '@angular/material/icon';
+import { MatToolbarModule } from '@angular/material/toolbar';
+
+@Component({
+  selector: 'app-floating-big-btn',
+  imports: [MatToolbarModule, MatIcon, MatIconButton],
+  templateUrl: './floating-big-btn.html',
+  styleUrl: './floating-big-btn.scss',
+})
+export class FloatingBigBtn {
+  readonly bigClick = output();
+  readonly icon = input('add');
+}