web/changelogs: display skeleton when changelog is loading

web/src/components/changelog/ChangelogSkeleton.svelte

@@ -0,0 +1,128 @@
+<script lang="ts">
+    import Skeleton from "$components/misc/Skeleton.svelte";
+    export let version: string;
+</script>
+
+<main>
+    <div id="changelog-header">
+        <div class="changelog-info">
+            <div class="changelog-version">{ version }</div>
+            <div class="changelog-date">
+                <Skeleton
+                    width="8em"
+                    height="16px"
+                />
+            </div>
+        </div>
+        <h1 class="changelog-title">
+            <Skeleton
+                width="28em"
+                height="27.59px"
+            />
+        </h1>
+    </div>
+    <div class="changelog-content">
+        <Skeleton
+            class="big changelog-banner"
+            width="100%"
+        />
+        <div class="contents">
+            {#each {length: 3 + Math.random() * 5} as _}
+                <p>
+                    <Skeleton
+                        width="100%"
+                        height={(Math.random() * 84 + 16) + 'px'}
+                    />
+                </p>
+            {/each}
+        </div>
+    </div>
+</main>
+
+<style>
+    main {
+        overflow-x: hidden;
+    }
+
+    #changelog-header {
+        display: flex;
+        flex-direction: column;
+        align-items: start;
+        gap: calc(var(--padding) / 2);
+        padding-bottom: 1em; /* match default <p> padding */
+    }
+
+    .changelog-info {
+        display: flex;
+        flex-direction: row;
+        align-items: center;
+        gap: 14px;
+    }
+
+    .changelog-version {
+        padding: 3px 8px;
+        border-radius: 6px;
+        background-color: var(--secondary);
+        color: var(--primary);
+        font-size: 18px;
+        font-weight: 500;
+    }
+
+    .changelog-date {
+        font-size: 13px;
+        font-weight: 500;
+        color: var(--gray);
+    }
+
+    .changelog-title {
+        padding: 0;
+        line-height: 1.2;
+        font-size: 23px;
+        user-select: text;
+        -webkit-user-select: text
+    }
+
+    :global(#banner-skeleton) {
+        display: block;
+        max-height: 320pt;
+        min-height: 210pt;
+        width: 100%;
+        aspect-ratio: 16/9;
+        border-radius: var(--padding);
+    }
+
+    .changelog-content {
+        display: flex;
+        flex-direction: column;
+        align-items: center;
+    }
+
+    .contents {
+        width: 100%;
+    }
+
+    .contents,
+    .contents :global(*) {
+        line-height: 1.7;
+        font-size: 14.5px;
+        font-weight: 410;
+        font-family: "Noto Sans Mono Variable", "Noto Sans Mono", monospace;
+        user-select: text;
+        -webkit-user-select: text;
+    }
+
+    :global(ul) {
+        padding-inline-start: 30px;
+    }
+
+    :global(li) {
+        padding-left: 3px;
+    }
+
+    @media screen and (max-width: 535px) {
+        .contents,
+        .contents :global(*) {
+            font-size: 14px;
+        }
+    }
+</style>