Page type-check: strict's flags that cost nothing, and catch variables as unknown (#235)

why(e) gives a caught error's message; each catch read e.message as any.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/items.ts

@@ -396,12 +396,12 @@ async function epAction(a: string, e, el, encId?: number){
         await api(`/api/enclosures/${enc.id}`,{method:'DELETE'});
       }catch(err){
         // 409: somebody else has it starred or unplayed. Their reason, their words.
-        if(!/one copy of this file/.test(err.message)) throw err;
-        if(!confirm(err.message+'\n\nDelete it anyway?')) return;
+        if(!/one copy of this file/.test(why(err))) throw err;
+        if(!confirm(why(err)+'\n\nDelete it anyway?')) return;
         await api(`/api/enclosures/${enc.id}?force=true`,{method:'DELETE'});
       }
       toast('Deleted'); loadEntries(); loadFeeds(true);
     }
-  }catch(err){ toast(err.message,true); }
+  }catch(err){ toast(why(err),true); }
 }