fix(plugins): trust platform certificates

Use the operating system trust store and Windows proxy settings while keeping TLS verification enabled. Add retryable registry errors with copyable diagnostics.\n\nRefs #563

src/videos.rs

@@ -65,10 +65,7 @@ pub fn load_cached() -> Vec<VideoEntry> {
 /// keeps whatever [`load_cached`] provided.
 #[cfg(not(target_arch = "wasm32"))]
 pub fn fetch_playlist() -> Result<Vec<VideoEntry>, String> {
-    let agent: ureq::Agent = ureq::Agent::config_builder()
-        .timeout_global(Some(std::time::Duration::from_secs(15)))
-        .build()
-        .into();
+    let agent = crate::network::agent(std::time::Duration::from_secs(15));
     let page = agent
         .get(PLAYLIST_URL)
         .header("User-Agent", "Mozilla/5.0")