fix: use per-video caption cache dir to prevent cross-video caption bleed

Subtitle downloads were going to a shared /tmp/video-clipper/subtitles/ dir,
so find_vtt_file could return captions from a previously-loaded video. Now
uses cache_manager::caption_cache_dir (URL-hash-keyed) with pre-download
cleanup, matching the existing per-video caching pattern.

Bump to v0.2.2.

Co-authored-by: Cursor <cursoragent@cursor.com>

src-tauri/Cargo.lock

@@ -1281,7 +1281,7 @@ dependencies = [
 
 [[package]]
 name = "gui-video-clipper"
-version = "0.2.1"
+version = "0.2.2"
 dependencies = [
  "axum",
  "dirs",

src-tauri/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "gui-video-clipper"
-version = "0.2.1"
+version = "0.2.2"
 description = "A macOS GUI app for clipping online videos"
 authors = ["cottongin"]
 edition = "2021"

src-tauri/src/commands/video.rs

@@ -1,5 +1,5 @@
 use crate::models::{CookieSource, VideoMetadata};
-use crate::services::{download_manager, subtitle_downloader, video_resolver};
+use crate::services::{cache_manager, download_manager, subtitle_downloader, video_resolver};
 use serde::Serialize;
 use std::io::{BufRead, BufReader};
 use tauri::ipc::Channel;
@@ -161,6 +161,9 @@ pub async fn check_cached_download(title: String, variant: String) -> Option<Str
 
 /// Download English VTT subtitles for a video URL.
 /// Returns the path to the .vtt file, or an error string.
+///
+/// Uses a per-video cache directory (keyed by URL hash) so subtitle files
+/// from different videos never collide.
 #[tauri::command]
 pub async fn download_subtitles(
     url: String,
@@ -168,12 +171,21 @@ pub async fn download_subtitles(
     is_auto: bool,
 ) -> Result<String, String> {
     tokio::task::spawn_blocking(move || {
-        let output_dir = std::env::temp_dir()
-            .join("video-clipper")
-            .join("subtitles")
+        let output_dir = cache_manager::caption_cache_dir(&url)
             .to_string_lossy()
             .to_string();
 
+        // Clean any stale .vtt files before downloading so find_vtt_file
+        // can only return a file belonging to *this* video.
+        if let Ok(entries) = std::fs::read_dir(&output_dir) {
+            for entry in entries.flatten() {
+                let path = entry.path();
+                if path.extension().and_then(|e| e.to_str()) == Some("vtt") {
+                    let _ = std::fs::remove_file(&path);
+                }
+            }
+        }
+
         eprintln!(
             "[video-clipper:subtitles] downloading (auto={}) to '{}'",
             is_auto, output_dir

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "GUI Video Clipper",
-  "version": "0.2.1",
+  "version": "0.2.2",
   "identifier": "xyz.cottongin.gui-video-clipper",
   "build": {
     "beforeDevCommand": "npm run dev",