fix(#4961): honor send query prefill flag

static/boot.js

@@ -109,9 +109,14 @@ async function _applyComposerPrefillOnBoot(prefillIntent){
   if(!msg) return;
   const text=String(prefillIntent.text||'');
   msg.value=text;
-  // Boot prefill is composer-only; URL params never submit on the user's behalf.
   if(typeof autoResize==='function') autoResize();
   else if(typeof updateSendBtn==='function') updateSendBtn();
+  if(!prefillIntent.autoSend) return;
+  if(typeof handleComposerPrimaryAction==='function'){
+    await handleComposerPrimaryAction();
+    return;
+  }
+  if(typeof send==='function') await send();
 }
 
 // Mobile navigation.

static/sessions.js

@@ -3221,7 +3221,7 @@ function _sessionIdFromLocation(){
   }catch(_e){return null;}
 }
 function _composerPrefillIntentFromLocation(){
-  const empty={hasParams:false,hasText:false,text:''};
+  const empty={hasParams:false,hasText:false,text:'',autoSend:false};
   if(typeof window==='undefined'||!window.location) return empty;
   try{
     const qs=new URLSearchParams(window.location.search||'');
@@ -3230,10 +3230,12 @@ function _composerPrefillIntentFromLocation(){
     const hasSend=qs.has('send');
     if(!hasQ&&!hasPrompt&&!hasSend) return empty;
     const text=hasQ?(qs.get('q')||''):(hasPrompt?(qs.get('prompt')||''):'');
+    const autoSend=hasSend&&/^(1|true|yes|on)$/i.test(String(qs.get('send')||'').trim());
     return {
       hasParams:true,
       hasText:!!String(text).trim(),
-      text
+      text,
+      autoSend
     };
   }catch(_e){return empty;}
 }

tests/test_4961_url_query_prefill.py

@@ -73,16 +73,19 @@ console.log(JSON.stringify({ first, second, third }));
         "hasParams": True,
         "hasText": True,
         "text": "hello world",
+        "autoSend": True,
     }
     assert payload["second"] == {
         "hasParams": True,
         "hasText": True,
         "text": "from prompt",
+        "autoSend": False,
     }
     assert payload["third"] == {
         "hasParams": True,
         "hasText": False,
         "text": "  ",
+        "autoSend": True,
     }
 
 
@@ -152,7 +155,7 @@ console.log(JSON.stringify(result));
     assert load_pos > prefill_guard
 
 
-def test_apply_prefill_updates_composer_without_autosend():
+def test_apply_prefill_updates_composer_and_optionally_autosends():
     source = _node_prelude() + """
 (async () => {
   evalBoot('_applyComposerPrefillOnBoot');
@@ -178,7 +181,7 @@ def test_apply_prefill_updates_composer_without_autosend():
 });
 """
     payload = json.loads(_run_node(source))
-    assert payload["counts"] == {"autoResize": 1, "updateSendBtn": 1, "send": 0}
+    assert payload["counts"] == {"autoResize": 1, "updateSendBtn": 1, "send": 1}
     assert payload["value"] == "second pass"