Persistent call banner (#341)

Co-authored-by: Aditya Chaudhary <30+useradityaa@noreply.coracle.social>

src/app/components/AppContainer.svelte

@@ -3,6 +3,7 @@
   import Dialog from "@lib/components/Dialog.svelte"
   import Landing from "@app/components/Landing.svelte"
   import Toast from "@app/components/Toast.svelte"
+  import CallBanner from "@app/components/CallBanner.svelte"
   import PrimaryNav from "@app/components/PrimaryNav.svelte"
   import {app} from "@app/core"
   import {modal} from "@app/modal"
@@ -14,13 +15,16 @@
   const {children}: Props = $props()
 </script>
 
-<div class="flex h-screen overflow-hidden">
-  {#if $app.user?.pubkey}
-    <PrimaryNav>
-      {@render children?.()}
-    </PrimaryNav>
-  {:else if !$modal}
-    <Dialog noEscape children={{component: Landing, props: {}}} />
-  {/if}
+<div class="flex h-screen flex-col overflow-hidden">
+  <div class="flex min-h-0 flex-1 overflow-hidden">
+    {#if $app.user?.pubkey}
+      <PrimaryNav>
+        {@render children?.()}
+      </PrimaryNav>
+    {:else if !$modal}
+      <Dialog noEscape children={{component: Landing, props: {}}} />
+    {/if}
+  </div>
+  <CallBanner />
 </div>
 <Toast />

src/app/components/CallBanner.svelte

@@ -0,0 +1,97 @@
+<script lang="ts">
+  import {fly} from "svelte/transition"
+  import {goto} from "$app/navigation"
+  import {page} from "$app/stores"
+  import cx from "classnames"
+  import {displayRelayUrl} from "@welshman/util"
+  import Microphone from "@assets/icons/microphone.svg?dataurl"
+  import MicrophoneOff from "@assets/icons/microphone-off.svg?dataurl"
+  import EndCall from "@assets/icons/end-call-rounded.svg?dataurl"
+  import Icon from "@lib/components/Icon.svelte"
+  import Button from "@lib/components/Button.svelte"
+  import {decodeRelay} from "@app/relays"
+  import {displayRoom} from "@app/rooms"
+  import {makeRoomPath} from "@app/routes"
+  import {
+    CallState,
+    callState,
+    callTargetRoom,
+    callMicMuted,
+    leaveVoiceRoom,
+    toggleMute,
+  } from "@app/call"
+
+  const {relay, h} = $derived($page.params)
+  const routeUrl = $derived(relay ? decodeRelay(relay) : undefined)
+
+  // The call's own room page already shows full controls (VoiceWidget), so
+  // the banner would just be redundant clutter there.
+  const isViewingCurrentVoiceRoom = $derived(
+    $callTargetRoom !== undefined &&
+      routeUrl !== undefined &&
+      typeof h === "string" &&
+      $callTargetRoom.url === routeUrl &&
+      $callTargetRoom.h === h,
+  )
+
+  const visible = $derived(
+    ($callState === CallState.Joining || $callState === CallState.Connected) &&
+      $callTargetRoom !== undefined &&
+      !isViewingCurrentVoiceRoom,
+  )
+
+  const roomName = $derived(
+    $callTargetRoom ? displayRoom($callTargetRoom.url, $callTargetRoom.h) : "",
+  )
+  const spaceName = $derived($callTargetRoom ? displayRelayUrl($callTargetRoom.url) : "")
+
+  const goToRoom = () => {
+    if (!$callTargetRoom) return
+    void goto(makeRoomPath($callTargetRoom.url, $callTargetRoom.h))
+  }
+</script>
+
+{#if visible}
+  <div
+    in:fly={{y: 60, duration: 250}}
+    out:fly={{y: 60, duration: 200}}
+    class="relative flex shrink-0 items-center gap-3 border-t border-line bg-surface py-2 pl-4 pr-2 mb-[calc(var(--saib)+3.5rem)] md:mb-[var(--saib)] md:pl-6">
+    <Button
+      class="flex min-w-0 flex-1 items-center gap-2 text-left"
+      onclick={goToRoom}
+      aria-label="Return to call in {roomName}">
+      <span
+        class={cx("h-2 w-2 shrink-0 rounded-full", {
+          "animate-pulse bg-warning": $callState === CallState.Joining,
+          "bg-success": $callState === CallState.Connected,
+        })}
+        aria-hidden="true"></span>
+      <span class="min-w-0 truncate text-sm">
+        <span class="font-semibold">
+          {$callState === CallState.Joining ? "Joining call…" : "Voice connected"}
+        </span>
+        <span class="text-content-muted">· {roomName} / {spaceName}</span>
+      </span>
+    </Button>
+    <div class="flex shrink-0 items-center gap-2">
+      {#if $callState === CallState.Connected}
+        <Button
+          aria-label={$callMicMuted ? "Unmute microphone" : "Mute microphone"}
+          aria-pressed={!$callMicMuted}
+          class={cx(
+            "button button-circle button-sm",
+            $callMicMuted ? "button-neutral" : "button-primary",
+          )}
+          onclick={toggleMute}>
+          <Icon icon={$callMicMuted ? MicrophoneOff : Microphone} size={4} />
+        </Button>
+      {/if}
+      <Button
+        aria-label="Leave voice room"
+        class="button button-circle button-sm button-error"
+        onclick={leaveVoiceRoom}>
+        <Icon icon={EndCall} size={4} />
+      </Button>
+    </div>
+  </div>
+{/if}