feat(design-system): add reusable Input primitive

ControlValueAccessor-based, standalone, OnPush. Sizes sm/md/lg, states default/error/success.
Colors/radius/spacing/transitions consumed via existing tenant CSS vars (--border-color,
--primary-color, --error-color, --success-color, etc) with fallbacks - compatible with
bootstrap JSON theming and Project Editor live preview.

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

@@ -0,0 +1,16 @@
+<input
+  class="app-input"
+  [class.app-input--sm]="size() === 'sm'"
+  [class.app-input--md]="size() === 'md'"
+  [class.app-input--lg]="size() === 'lg'"
+  [class.app-input--error]="state() === 'error'"
+  [class.app-input--success]="state() === 'success'"
+  [type]="type()"
+  [placeholder]="placeholder()"
+  [disabled]="isDisabled || disabled()"
+  [attr.aria-label]="ariaLabel()"
+  [attr.aria-invalid]="state() === 'error' || null"
+  [value]="value"
+  (input)="handleInput($event)"
+  (blur)="handleBlur()"
+/>

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

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+:host {
+  display: inline-block;
+}
+
+:host.app-input-host--full-width {
+  display: block;
+  width: 100%;
+}
+
+.app-input {
+  width: 100%;
+  border: 1px solid var(--border-color, #e4e4e7);
+  border-radius: var(--radius-md, 6px);
+  background: var(--bg-primary, #fff);
+  color: var(--text-primary, #1f322d);
+  font-family: inherit;
+  line-height: 1;
+  transition: border-color var(--transition-fast, 120ms ease),
+    box-shadow var(--transition-fast, 120ms ease);
+
+  &::placeholder {
+    color: var(--text-secondary, #6b7280);
+  }
+
+  &:hover:not(:disabled) {
+    border-color: var(--primary-color, #2f6e5d);
+  }
+
+  &:focus-visible {
+    outline: none;
+    border-color: var(--primary-color, #2f6e5d);
+    box-shadow: 0 0 0 2px color-mix(in srgb, var(--primary-color, #2f6e5d) 25%, transparent);
+  }
+
+  &:disabled {
+    cursor: not-allowed;
+    opacity: 0.6;
+  }
+}
+
+.app-input--sm {
+  height: 32px;
+  padding: 0 var(--space-sm, 0.5rem);
+  font-size: 0.8125rem;
+}
+
+.app-input--md {
+  height: 40px;
+  padding: 0 var(--space-md, 1rem);
+  font-size: 0.9375rem;
+}
+
+.app-input--lg {
+  height: 48px;
+  padding: 0 var(--space-lg, 1.5rem);
+  font-size: 1rem;
+}
+
+.app-input--error {
+  border-color: var(--error-color, #c0392b);
+
+  &:focus-visible {
+    border-color: var(--error-color, #c0392b);
+    box-shadow: 0 0 0 2px color-mix(in srgb, var(--error-color, #c0392b) 25%, transparent);
+  }
+}
+
+.app-input--success {
+  border-color: var(--success-color, #2e7d32);
+
+  &:focus-visible {
+    border-color: var(--success-color, #2e7d32);
+    box-shadow: 0 0 0 2px color-mix(in srgb, var(--success-color, #2e7d32) 25%, transparent);
+  }
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .app-input {
+    transition: none;
+  }
+}

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

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+import { ChangeDetectionStrategy, Component, forwardRef, input } from '@angular/core';
+import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
+
+export type InputSize = 'sm' | 'md' | 'lg';
+export type InputState = 'default' | 'error' | 'success';
+
+@Component({
+  selector: 'app-input',
+  standalone: true,
+  templateUrl: './input.component.html',
+  styleUrl: './input.component.scss',
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  providers: [
+    {
+      provide: NG_VALUE_ACCESSOR,
+      useExisting: forwardRef(() => InputComponent),
+      multi: true
+    }
+  ],
+  host: {
+    '[class.app-input-host--full-width]': 'fullWidth()'
+  }
+})
+export class InputComponent implements ControlValueAccessor {
+  readonly type = input<'text' | 'email' | 'password' | 'number' | 'search' | 'tel' | 'url'>('text');
+  readonly size = input<InputSize>('md');
+  readonly state = input<InputState>('default');
+  readonly placeholder = input('');
+  readonly disabled = input(false);
+  readonly fullWidth = input(false);
+  readonly ariaLabel = input<string | null>(null);
+
+  protected value: string | number = '';
+  protected isDisabled = false;
+
+  private onChange: (value: string | number) => void = () => {};
+  private onTouched: () => void = () => {};
+
+  writeValue(value: string | number): void {
+    this.value = value ?? '';
+  }
+
+  registerOnChange(fn: (value: string | number) => void): void {
+    this.onChange = fn;
+  }
+
+  registerOnTouched(fn: () => void): void {
+    this.onTouched = fn;
+  }
+
+  setDisabledState(isDisabled: boolean): void {
+    this.isDisabled = isDisabled;
+  }
+
+  protected handleInput(event: Event): void {
+    const target = event.target as HTMLInputElement;
+    this.value = target.value;
+    this.onChange(this.value);
+  }
+
+  protected handleBlur(): void {
+    this.onTouched();
+  }
+}