fix: mpv loadfile index arg, cache polling, and sidebar CSS

- Pass integer index (-1) to mpv loadfile command for newer mpv versions
- Poll /api/cache/status instead of streaming endpoints to avoid
  downloading video bodies during readiness checks
- Cancel previous polling when selecting a new file
- Fix sidebar flex-shrink and file name text overflow

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

client/src-tauri/src/mpv.rs

@@ -117,9 +117,14 @@ impl Mpv {
     }
 
     pub fn load_file(&mut self, video_url: &str, audio_url: &str) -> Result<(), String> {
-        // Pass audio-file option during load so both streams sync from the start
         let options = format!("audio-file={}", audio_url);
-        self.command(&["loadfile", video_url, "replace", &options])
+        let resp = self.send_and_recv(json!({
+            "command": ["loadfile", video_url, "replace", -1, options]
+        }))?;
+        if resp.get("error").and_then(|e| e.as_str()) != Some("success") {
+            return Err(format!("mpv error: {}", resp.get("error").unwrap_or(&Value::Null)));
+        }
+        Ok(())
     }
 
     pub fn seek(&mut self, time: f64) -> Result<(), String> {

client/src/components/FileBrowser.svelte

@@ -7,6 +7,7 @@
   } from "$lib/stores";
 
   let selectedRoot = $state("");
+  let currentFolder = $state("");
 
   onMount(async () => {
     $roots = await getRoots();
@@ -30,11 +31,44 @@
     $hiddenFiles = new Set(hidden);
   }
 
+  // Derive subfolders and files at current folder level
+  let subfolders = $derived.by(() => {
+    const prefix = currentFolder ? currentFolder + "/" : "";
+    const folderSet = new Set<string>();
+    for (const f of $visibleFiles) {
+      if (!f.path.startsWith(prefix)) continue;
+      const rest = f.path.slice(prefix.length);
+      const slashIdx = rest.indexOf("/");
+      if (slashIdx !== -1) {
+        folderSet.add(rest.slice(0, slashIdx));
+      }
+    }
+    return [...folderSet].sort();
+  });
+
+  let currentFiles = $derived.by(() => {
+    const prefix = currentFolder ? currentFolder + "/" : "";
+    return $visibleFiles.filter(f => {
+      if (!f.path.startsWith(prefix)) return false;
+      const rest = f.path.slice(prefix.length);
+      return !rest.includes("/"); // only direct children
+    });
+  });
+
   async function selectFile(file: typeof $files[0]) {
     $currentFile = file;
     $markers = await getMarkers(file.name, $profile);
   }
 
+  function navigateToFolder(name: string) {
+    currentFolder = currentFolder ? currentFolder + "/" + name : name;
+  }
+
+  function navigateUp() {
+    const idx = currentFolder.lastIndexOf("/");
+    currentFolder = idx === -1 ? "" : currentFolder.slice(0, idx);
+  }
+
   function formatSize(bytes: number): string {
     if (bytes > 1e9) return (bytes / 1e9).toFixed(1) + " GB";
     if (bytes > 1e6) return (bytes / 1e6).toFixed(0) + " MB";
@@ -53,15 +87,24 @@
 
 <div class="file-browser">
   <div class="controls">
-    <select bind:value={selectedRoot} onchange={loadFiles}>
+    <select bind:value={selectedRoot} onchange={() => { currentFolder = ""; loadFiles(); }}>
       {#each $roots as root}
         <option value={root}>{root}</option>
       {/each}
     </select>
     <label><input type="checkbox" bind:checked={$showHidden} /> Hidden</label>
   </div>
+  {#if currentFolder}
+    <div class="breadcrumb" onclick={navigateUp}>.. / {currentFolder}</div>
+  {/if}
   <ul class="file-list">
-    {#each $visibleFiles as file}
+    {#each subfolders as folder}
+      <li class="folder" onclick={() => navigateToFolder(folder)}>
+        <span class="name">{folder}/</span>
+        <span class="badge">dir</span>
+      </li>
+    {/each}
+    {#each currentFiles as file}
       <li
         class:selected={$currentFile?.path === file.path}
         onclick={() => selectFile(file)}
@@ -94,6 +137,18 @@
     border: 1px solid #444;
     padding: 2px;
   }
+  .breadcrumb {
+    padding: 3px 8px;
+    font-size: 11px;
+    color: #88aaff;
+    cursor: pointer;
+    background: #252525;
+    border-bottom: 1px solid #333;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+  }
+  .breadcrumb:hover { background: #2a2a2a; }
   .file-list {
     list-style: none;
     padding: 0;
@@ -107,8 +162,12 @@
     display: flex;
     justify-content: space-between;
     font-size: 12px;
+    white-space: nowrap;
   }
   .file-list li:hover { background: #333; }
   .file-list li.selected { background: #0066cc; }
-  .size { color: #888; font-size: 11px; }
+  .file-list li.folder { color: #88aaff; }
+  .name { flex: 1; overflow: hidden; text-overflow: ellipsis; }
+  .size { flex-shrink: 0; margin-left: 8px; color: #888; font-size: 11px; }
+  .badge { flex-shrink: 0; margin-left: 8px; color: #666; font-size: 10px; }
 </style>

client/src/components/ProfileBar.svelte

@@ -1,17 +1,31 @@
 <script lang="ts">
   import { onMount } from "svelte";
-  import { getProfiles } from "$lib/api";
+  import { getProfiles, setServer, getServer } from "$lib/api";
-  import { profile, subprofiles } from "$lib/stores";
+  import { profile, subprofiles, serverUrl } from "$lib/stores";
+  import { saveSettings } from "$lib/settings";
 
   let profiles = $state<string[]>([]);
+  let serverInput = $state(getServer());
 
   onMount(async () => {
+    serverInput = getServer();
+    try {
       profiles = await getProfiles();
       if (profiles.length && !profiles.includes($profile)) {
         $profile = profiles[0];
       }
+    } catch { /* server not reachable yet */ }
   });
 
+  function applyServer() {
+    const url = serverInput.replace(/\/+$/, "");
+    setServer(url);
+    $serverUrl = url;
+    saveSettings();
+    // Reload profiles from new server
+    getProfiles().then(p => { profiles = p; }).catch(() => {});
+  }
+
   function addSubprofile() {
     const name = prompt("Subprofile suffix:");
     if (name && !$subprofiles.includes(name)) {
@@ -25,6 +39,15 @@
 </script>
 
 <div class="profile-bar">
+  <input
+    class="server-input"
+    type="text"
+    bind:value={serverInput}
+    onkeydown={(e) => { if (e.key === "Enter") applyServer(); }}
+    placeholder="http://host:8000"
+  />
+  <button onclick={applyServer}>Set</button>
+
   <select bind:value={$profile}>
     {#each profiles as p}
       <option value={p}>{p}</option>
@@ -49,6 +72,14 @@
     padding: 4px;
     font-size: 12px;
   }
+  .server-input {
+    width: 180px;
+    background: #2d2d2d;
+    color: #e0e0e0;
+    border: 1px solid #444;
+    padding: 2px 4px;
+    font-size: 11px;
+  }
   select { background: #2d2d2d; color: #e0e0e0; border: 1px solid #444; }
   .subs { display: flex; gap: 4px; align-items: center; }
   .sub-tag {

client/src/lib/api.ts

@@ -63,6 +63,25 @@ export function audioUrl(path: string, root: string): string {
   return `${serverUrl}/api/audio/${encodePath(path)}?root=${encodeURIComponent(root)}`;
 }
 
+/** Poll cache status until both video and audio are ready. */
+export async function waitForCache(
+  path: string, root: string, quality: string,
+  signal: AbortSignal, interval = 2000
+): Promise<void> {
+  const url = `${serverUrl}/api/cache/status/${encodePath(path)}?root=${encodeURIComponent(root)}`;
+  // Trigger transcode/audio extraction by hitting stream+audio once
+  await fetch(streamUrl(path, root, quality), { signal }).catch(() => {});
+  await fetch(audioUrl(path, root), { signal }).catch(() => {});
+
+  while (!signal.aborted) {
+    const res = await fetch(url, { signal });
+    const status = await res.json();
+    if (status[quality] === "ready" && status.audio === "ready") return;
+    await new Promise(r => setTimeout(r, interval));
+  }
+  throw new Error("Aborted");
+}
+
 export function cacheStatus(path: string, root: string): Promise<Record<string, string>> {
   return get(`/api/cache/status/${encodePath(path)}?root=${encodeURIComponent(root)}`);
 }

client/src/routes/+page.svelte

@@ -5,7 +5,7 @@
   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 { streamUrl, audioUrl, waitForCache, deleteExport, getMarkers } from "$lib/api";
   import { connectExportWs, disconnectExportWs } from "$lib/ws";
   import { loadSettings, saveSettings } from "$lib/settings";
   import {
@@ -48,16 +48,24 @@
   });
 
   // Load file into mpv when currentFile OR quality changes
+  let loadAbort: AbortController | null = null;
   $effect(() => {
     const file = $currentFile;
     const q = $quality;
     if (file) {
+      // Cancel any previous polling
+      loadAbort?.abort();
+      const ac = new AbortController();
+      loadAbort = ac;
+
       const vUrl = streamUrl(file.path, file.root, q);
       const aUrl = audioUrl(file.path, file.root);
-      mpvLoad(vUrl, aUrl).then(async () => {
+      waitForCache(file.path, file.root, q, ac.signal).then(() =>
+        mpvLoad(vUrl, aUrl)
+      ).then(async () => {
         await new Promise(r => setTimeout(r, 500));
         try { $duration = await mpvDuration(); } catch {}
-      });
+      }).catch(() => {}); // aborted or error
     }
   });
 
@@ -198,6 +206,8 @@
   }
   .sidebar {
     width: 220px;
+    min-width: 220px;
+    flex-shrink: 0;
     border-right: 1px solid #333;
     overflow: hidden;
   }

server/app.py

@@ -1,4 +1,5 @@
 from fastapi import FastAPI, WebSocket
+from fastapi.middleware.cors import CORSMiddleware
 
 from core.db import ProcessedDB
 from .config import DB_PATH
@@ -7,6 +8,13 @@ from . import ws
 
 app = FastAPI(title="8-cut Server")
 
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
 db = ProcessedDB(DB_PATH)
 
 app.include_router(files.router, prefix="/api")