refactor!: add client_type field to DownloadError, rename cli option po-token-cache to pot-cache

cli/README.md

@@ -146,6 +146,7 @@ Fetch a list of all the items saved in your YouTube/YouTube Music profile.
   given path for generating PO tokens
 - `--no-botguard` Disable Botguard, only download videos using clients that dont require
   it
+- `--pot-cache` Enable caching for session-bound PO tokens
 
 ### Output format
 

cli/src/main.rs

@@ -72,7 +72,7 @@ struct Cli {
     no_botguard: bool,
     /// Enable caching for session-bound PO tokens
     #[clap(long, global = true)]
-    po_token_cache: bool,
+    pot_cache: bool,
 }
 
 #[derive(Parser)]
@@ -916,7 +916,7 @@ async fn run() -> anyhow::Result<()> {
     if cli.no_botguard {
         rp = rp.no_botguard();
     }
-    if cli.po_token_cache {
+    if cli.pot_cache {
         rp = rp.po_token_cache();
     }
     if cli.auth {