feat: wire up main app layout with all components

Sidebar file browser, canvas timeline, transport bar, export panel,
profile bar, keyboard shortcuts, quality-reactive stream reload.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/src/routes/+page.svelte

@@ -1,8 +1,173 @@
 <script lang="ts">
+  import { onMount, onDestroy } from "svelte";
+  import FileBrowser from "../components/FileBrowser.svelte";
+  import Timeline from "../components/Timeline.svelte";
+  import ExportPanel from "../components/ExportPanel.svelte";
+  import ProfileBar from "../components/ProfileBar.svelte";
+  import { mpvStart, mpvLoad, mpvSeek, mpvPause, mpvResume, mpvSetLoop, mpvClearLoop, mpvTimePos, mpvDuration } from "$lib/mpv";
+  import { streamUrl, audioUrl, deleteExport, getMarkers } from "$lib/api";
+  import { connectExportWs } from "$lib/ws";
+  import {
+    currentFile, cursor, duration, playPos, playing, quality,
+    clips, spread, locked, markers, profile, clipSpan, subprofiles
+  } from "$lib/stores";
+
+  let pollInterval: ReturnType<typeof setInterval>;
+  let exportPanelRef: ExportPanel;
+
+  onMount(async () => {
+    await mpvStart();
+    connectExportWs();
+
+    // Poll mpv for time position
+    pollInterval = setInterval(async () => {
+      if ($playing) {
+        try {
+          $playPos = await mpvTimePos();
+        } catch { /* mpv not ready */ }
+      }
+    }, 50);
+  });
+
+  onDestroy(() => {
+    clearInterval(pollInterval);
+  });
+
+  // Load file into mpv when currentFile OR quality changes
+  $effect(() => {
+    const file = $currentFile;
+    const q = $quality;
+    if (file) {
+      const vUrl = streamUrl(file.path, file.root, q);
+      const aUrl = audioUrl(file.path, file.root);
+      mpvLoad(vUrl, aUrl).then(async () => {
+        await new Promise(r => setTimeout(r, 500));
+        try { $duration = await mpvDuration(); } catch {}
+      });
+    }
+  });
+
+  async function handleCursorChange(time: number) {
+    await mpvSeek(time);
+  }
+
+  async function handlePlay() {
+    const a = $cursor;
+    const b = $cursor + $clipSpan;
+    await mpvSeek(a);
+    await mpvSetLoop(a, b);
+    await mpvResume();
+    $playing = true;
+  }
+
+  async function handlePause() {
+    await mpvPause();
+    await mpvClearLoop();
+    $playing = false;
+  }
+
+  async function handleMarkerClick(m: { start_time: number; output_path: string }) {
+    if ($locked) {
+      const span = 8.0 + ($clips - 1) * $spread;
+      $cursor = m.start_time + span;
+      await mpvSeek($cursor);
+    } else {
+      $cursor = m.start_time;
+      await mpvSeek(m.start_time);
+    }
+  }
+
+  async function handleMarkerDelete(outputPath: string) {
+    await deleteExport(outputPath);
+    if ($currentFile) {
+      $markers = await getMarkers($currentFile.name, $profile);
+    }
+  }
+
+  function handleKeydown(e: KeyboardEvent) {
+    const tag = (e.target as HTMLElement).tagName;
+    if (tag === "INPUT" || tag === "SELECT" || tag === "TEXTAREA") return;
+
+    switch (e.key) {
+      case " ":
+        e.preventDefault();
+        $playing ? handlePause() : handlePlay();
+        break;
+      case "e":
+      case "E":
+        exportPanelRef?.doExport();
+        break;
+      case "ArrowLeft":
+        $cursor = Math.max(0, $cursor - 1);
+        handleCursorChange($cursor);
+        break;
+      case "ArrowRight":
+        $cursor = Math.min($duration, $cursor + 1);
+        handleCursorChange($cursor);
+        break;
+    }
+
+    const num = parseInt(e.key);
+    if (num >= 1 && num <= 9) {
+      const idx = num - 1;
+      if (idx < $subprofiles.length) {
+        exportPanelRef?.doExport($subprofiles[idx]);
+      }
+    }
+  }
+
+  function fmtTime(s: number): string {
+    const m = Math.floor(s / 60);
+    const sec = (Math.floor(s % 60 * 10) / 10).toFixed(1);
+    return `${m}:${sec.padStart(4, "0")}`;
+  }
 </script>
 
+<svelte:window onkeydown={handleKeydown} />
+
 <main>
-  <h1>8-cut</h1>
+  <div class="layout">
+    <div class="sidebar">
+      <FileBrowser />
+    </div>
+    <div class="content">
+      <ProfileBar />
+      <div class="player-area">
+        <div class="video-placeholder">
+          {#if $currentFile}
+            <p>{$currentFile.name}</p>
+          {:else}
+            <p>Select a file</p>
+          {/if}
+        </div>
+      </div>
+      <Timeline
+        onCursorChange={handleCursorChange}
+        onSeek={handleCursorChange}
+        onMarkerClick={handleMarkerClick}
+        onMarkerDelete={handleMarkerDelete}
+      />
+      <div class="transport">
+        <button onclick={handlePlay} disabled={!$currentFile}>Play</button>
+        <button onclick={handlePause}>Pause</button>
+        <button onclick={() => $locked = !$locked}>
+          {$locked ? "Locked" : "Unlocked"}
+        </button>
+        <span class="time">
+          {#if $duration > 0}
+            {fmtTime($cursor)} / {fmtTime($duration)}
+          {/if}
+        </span>
+        <select bind:value={$quality} style="margin-left:auto">
+          <option value="potato">480p</option>
+          <option value="low">720p</option>
+          <option value="medium">1080p</option>
+          <option value="high">Original</option>
+        </select>
+      </div>
+      <ExportPanel bind:this={exportPanelRef} />
+    </div>
+  </div>
 </main>
 
 <style>
@@ -12,9 +177,51 @@
     background: #1e1e1e;
     color: #e0e0e0;
   }
-  main {
+  main { height: 100vh; overflow: hidden; }
-    padding: 8px;
+  .layout {
-    height: 100vh;
+    display: flex;
-    box-sizing: border-box;
+    height: 100%;
   }
+  .sidebar {
+    width: 220px;
+    border-right: 1px solid #333;
+    overflow: hidden;
+  }
+  .content {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    overflow: hidden;
+  }
+  .player-area {
+    flex: 1;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    background: #000;
+    min-height: 200px;
+  }
+  .video-placeholder {
+    color: #666;
+    text-align: center;
+  }
+  .transport {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    padding: 4px 8px;
+    background: #222;
+  }
+  .transport button {
+    background: #333;
+    color: #e0e0e0;
+    border: 1px solid #555;
+    padding: 4px 10px;
+    cursor: pointer;
+  }
+  .time {
+    font-family: monospace;
+    font-size: 13px;
+  }
+  select { background: #2d2d2d; color: #e0e0e0; border: 1px solid #444; }
 </style>