feat(ComparisonWrapper): remove props and add checks for fonts absence

src/widgets/ComparisonSlider/ui/ComparisonSlider/ComparisonSlider.svelte

@@ -9,38 +9,26 @@
     - Responsive layout with Tailwind breakpoints for font sizing.
     - Performance optimized using offscreen canvas for measurements and transform-based animations.
 -->
-<script lang="ts" generics="T extends { name: string; id: string }">
+<script lang="ts">
+import { displayedFontsStore } from '$features/DisplayFont';
 import {
     createCharacterComparison,
     createTypographyControl,
 } from '$shared/lib';
 import type { LineData } from '$shared/lib';
+import { cubicOut } from 'svelte/easing';
 import { Spring } from 'svelte/motion';
+import { fly } from 'svelte/transition';
 import CharacterSlot from './components/CharacterSlot.svelte';
 import ControlsWrapper from './components/ControlsWrapper.svelte';
 import Labels from './components/Labels.svelte';
 import SliderLine from './components/SliderLine.svelte';
 
-interface Props<T extends { name: string; id: string }> {
-    /**
-     * First font definition ({name, id})
-     */
-    fontA: T;
-    /**
-     * Second font definition ({name, id})
-     */
-    fontB: T;
-    /**
-     * Text to display and compare
-     */
-    text?: string;
-}
-
-let {
-    fontA,
-    fontB,
-    text = $bindable('The quick brown fox jumps over the lazy dog'),
-}: Props<T> = $props();
+// Displayed text
+let text = $state('The quick brown fox jumps over the lazy dog...');
+// Pair of fonts to compare
+const fontA = $derived(displayedFontsStore.fontA);
+const fontB = $derived(displayedFontsStore.fontB);
 
 let container: HTMLElement | undefined = $state();
 let controlsWrapperElement = $state<HTMLDivElement | null>(null);
@@ -98,7 +86,6 @@ function handleMove(e: PointerEvent) {
 
 function startDragging(e: PointerEvent) {
     if (e.target === controlsWrapperElement || controlsWrapperElement?.contains(e.target as Node)) {
-        console.log('Pointer down on controls wrapper');
         e.stopPropagation();
         return;
     }
@@ -162,6 +149,7 @@ $effect(() => {
                 - Font Family switches based on `isPast`
                 - Transitions/Transforms provide the "morph" feel
             -->
+            {#if fontA && fontB}
                 <CharacterSlot
                     {char}
                     {proximity}
@@ -171,14 +159,16 @@ $effect(() => {
                     fontAName={fontA.name}
                     fontBName={fontB.name}
                 />
+            {/if}
         {/each}
     </div>
 {/snippet}
 
-<!-- Hidden canvas used for text measurement by the helper -->
-<canvas bind:this={measureCanvas} class="hidden" width="1" height="1"></canvas>
+{#if fontA && fontB}
+    <!-- Hidden canvas used for text measurement by the helper -->
+    <canvas bind:this={measureCanvas} class="hidden" width="1" height="1"></canvas>
 
-<div class="relative">
+    <div class="relative">
         <div
             bind:this={container}
             role="slider"
@@ -192,6 +182,7 @@ $effect(() => {
                 select-none touch-none cursor-ew-resize min-h-100 flex flex-col justify-center
             "
             class:box-shadow={'-20px 20px 60px #bebebe, 20px -20px 60px #ffffff;'}
+            in:fly={{ y: 0, x: -50, duration: 300, easing: cubicOut, opacity: 0.2 }}
         >
             <!-- Background Gradient Accent -->
             <div
@@ -225,10 +216,10 @@ $effect(() => {
                 {/each}
             </div>
 
-        <!-- Visual Components -->
             <SliderLine {sliderPos} {isDragging} />
-        <Labels {fontA} {fontB} {sliderPos} />
         </div>
+
+        <Labels fontA={fontA} fontB={fontB} {sliderPos} />
         <!-- Since there're slider controls inside we put them outside the main one -->
         <ControlsWrapper
             bind:wrapper={controlsWrapperElement}
@@ -240,4 +231,5 @@ $effect(() => {
             sizeControl={sizeControl}
             heightControl={heightControl}
         />
-</div>
+    </div>
+{/if}