chore: redesign threads as a linear phpBB-style forum view (#300)

Co-authored-by: userAdityaa <aditya.chaudhary1558@gmail.com>
Co-committed-by: userAdityaa <aditya.chaudhary1558@gmail.com>

src/app/components/ThreadBoardItem.svelte

@@ -0,0 +1,48 @@
+<script lang="ts">
+  import {formatTimestamp, max} from "@welshman/lib"
+  import type {TrustedEvent} from "@welshman/util"
+  import {COMMENT, getTagValue} from "@welshman/util"
+  import Link from "@lib/components/Link.svelte"
+  import ProfileCircle from "@app/components/ProfileCircle.svelte"
+  import ProfileName from "@app/components/ProfileName.svelte"
+  import {deriveEventsForUrl} from "@app/repository"
+  import {makeThreadPath} from "@app/routes"
+
+  type Props = {
+    url: string
+    event: TrustedEvent
+  }
+
+  const {url, event}: Props = $props()
+
+  const filters = [{kinds: [COMMENT], "#E": [event.id]}]
+  const replies = deriveEventsForUrl(url, filters)
+  const replyCount = $derived($replies.length)
+  const lastActive = $derived(max([...$replies, event].map(e => e.created_at)))
+  const title = getTagValue("title", event.tags)
+</script>
+
+<Link
+  href={makeThreadPath(url, event.id)}
+  class="grid grid-cols-[1fr_auto] gap-x-3 gap-y-1 border-b border-base-content/10 px-3 py-3 transition-colors hover:bg-base-200/50 sm:grid-cols-[1fr_8rem_5rem_8rem] sm:items-center sm:gap-x-4 sm:px-4">
+  <div class="col-span-2 min-w-0 sm:col-span-1">
+    <p class="ellipsize text-sm font-bold sm:text-base">{title || "Untitled thread"}</p>
+    <p class="ellipsize mt-0.5 text-xs opacity-60 sm:hidden">
+      by <ProfileName pubkey={event.pubkey} {url} />
+    </p>
+  </div>
+  <div class="hidden items-center gap-2 sm:flex">
+    <ProfileCircle pubkey={event.pubkey} {url} size={6} />
+    <span class="ellipsize text-sm">
+      <ProfileName pubkey={event.pubkey} {url} />
+    </span>
+  </div>
+  <p class="text-right text-xs opacity-75 sm:text-center sm:text-sm">
+    <span class="opacity-60 sm:hidden">Replies · </span>
+    {replyCount}
+  </p>
+  <p class="text-right text-xs opacity-75 sm:text-sm">
+    <span class="opacity-60 sm:hidden">Last · </span>
+    {formatTimestamp(lastActive)}
+  </p>
+</Link>