feat: Add festive visual effects (#2252)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> Introduces an effects system (fireworks, ghost, hearts, shamrocks,
snow), a new `effect` action, and optional date-based loading effects,
integrated into the card with docs, schema, editor, and tests.
> 
> - **Effects System**:
> - Add `EffectsController` and `advanced-camera-card-effects` host with
lazy-loaded effect modules (`fireworks`, `ghost`, `hearts`, `shamrocks`,
`snow`).
> - New base effect component with fade-in/out; SCSS and z-index
updates.
> - **Actions**:
> - New custom action `advanced_camera_card_action: effect` with
`effect_action` (`start`|`stop`|`toggle`).
>   - Wire into `ActionFactory` and add `EffectAction` executor.
> - **Card Integration**:
> - Mount effects host in `advanced-camera-card` and expose
`getEffectsControllerAPI()` via `CardController`.
> - Loading component can trigger date-based effects (e.g., New Year
fireworks) when enabled.
> - **Configuration & Editor**:
> - Add `performance.features.card_loading_effects` (default `true`)
alongside `card_loading_indicator`.
> - Update schemas, defaults, low-performance profile (disables
effects), and editor toggles.
> - **Docs & Examples**:
>   - Document `effect` action parameters and add menu example.
>   - Update performance docs with new option.
> - **Localization & Tests**:
>   - Update i18n strings for new performance option.
> - Add comprehensive tests for effects controller, action, factory,
config defaults/profiles, and utilities.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
cffd4304fe3bd22340316f9cec53e341379b1756. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

src/components/effects/firework-particle.ts

@@ -0,0 +1,54 @@
+import { CSSResultGroup, html, LitElement, TemplateResult, unsafeCSS } from 'lit';
+import { customElement, property } from 'lit/decorators.js';
+import fireworkParticleStyle from '../../scss/firework-particle.scss';
+
+@customElement('advanced-camera-card-firework-particle')
+export class AdvancedCameraCardFireworkParticle extends LitElement {
+  @property({ type: Number })
+  public angle = 0;
+
+  @property({ type: Number })
+  public distance = 100;
+
+  @property({ type: String })
+  public color = '#ffcc00';
+
+  @property({ type: String })
+  public size = '4px';
+
+  @property({ type: String })
+  public duration = '1.5s';
+
+  @property({ type: String })
+  public delay = '0s';
+
+  @property({ type: Number })
+  public gravity = 0;
+
+  protected render(): TemplateResult {
+    return html`<span class="spark">✦</span>`;
+  }
+
+  protected updated(): void {
+    const radians = (this.angle * Math.PI) / 180;
+    const endX = Math.cos(radians) * this.distance;
+    const endY = Math.sin(radians) * this.distance + this.gravity;
+
+    this.style.setProperty('--end-x', `${endX}px`);
+    this.style.setProperty('--end-y', `${endY}px`);
+    this.style.setProperty('--color', this.color);
+    this.style.setProperty('--size', this.size);
+    this.style.setProperty('--duration', this.duration);
+    this.style.setProperty('--delay', this.delay);
+  }
+
+  static get styles(): CSSResultGroup {
+    return unsafeCSS(fireworkParticleStyle);
+  }
+}
+
+declare global {
+  interface HTMLElementTagNameMap {
+    'advanced-camera-card-firework-particle': AdvancedCameraCardFireworkParticle;
+  }
+}