feat(design-system): add reusable Card primitive

Standalone, OnPush, content-projection container. Padding none/sm/md/lg,
bordered and interactive variants. Colors/radius/shadow/spacing consumed
via existing tenant CSS vars with fallbacks.

src/app/shared/ui/card/card.component.html

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+<ng-content />

src/app/shared/ui/card/card.component.scss

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+:host {
+  display: block;
+  background: var(--bg-primary, #fff);
+  border-radius: var(--radius-lg, 10px);
+  box-shadow: var(--shadow-sm, 0 1px 2px rgba(0, 0, 0, 0.06));
+  transition: box-shadow var(--transition-fast, 120ms ease),
+    border-color var(--transition-fast, 120ms ease);
+}
+
+:host.app-card--bordered {
+  border: 1px solid var(--border-color, #e4e4e7);
+}
+
+:host.app-card--interactive {
+  cursor: pointer;
+
+  &:hover {
+    box-shadow: var(--shadow-md, 0 4px 12px rgba(0, 0, 0, 0.08));
+  }
+
+  &:focus-visible {
+    outline: 2px solid var(--primary-color, #2f6e5d);
+    outline-offset: 2px;
+  }
+}
+
+:host.app-card--pad-none {
+  padding: 0;
+}
+
+:host.app-card--pad-sm {
+  padding: var(--space-sm, 0.5rem);
+}
+
+:host.app-card--pad-md {
+  padding: var(--space-md, 1rem);
+}
+
+:host.app-card--pad-lg {
+  padding: var(--space-lg, 1.5rem);
+}
+
+@media (prefers-reduced-motion: reduce) {
+  :host {
+    transition: none;
+  }
+}

src/app/shared/ui/card/card.component.ts

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+import { ChangeDetectionStrategy, Component, input } from '@angular/core';
+
+export type CardPadding = 'none' | 'sm' | 'md' | 'lg';
+
+@Component({
+  selector: 'app-card',
+  standalone: true,
+  templateUrl: './card.component.html',
+  styleUrl: './card.component.scss',
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  host: {
+    '[class.app-card--bordered]': 'bordered()',
+    '[class.app-card--interactive]': 'interactive()',
+    '[class.app-card--pad-none]': "padding() === 'none'",
+    '[class.app-card--pad-sm]': "padding() === 'sm'",
+    '[class.app-card--pad-md]': "padding() === 'md'",
+    '[class.app-card--pad-lg]': "padding() === 'lg'"
+  }
+})
+export class CardComponent {
+  readonly padding = input<CardPadding>('md');
+  readonly bordered = input(true);
+  readonly interactive = input(false);
+}