fix: respect user keybinding configuration for input_submit/input_newline

packages/opencode/src/cli/cmd/tui/component/prompt/autocomplete.tsx

@@ -566,7 +566,13 @@ export function Autocomplete(props: {
           }
           if (name === "return") {
             select()
-            e.preventDefault()
+            // After selection, autocomplete is hidden. If the key that triggered
+            // this is also the submit keybinding, we need to let the event
+            // propagate so the prompt can handle submission.
+            // Only prevent default if autocomplete is still visible (selection failed).
+            if (store.visible) {
+              e.preventDefault()
+            }
             return
           }
           if (name === "tab") {

packages/opencode/src/cli/cmd/tui/component/textarea-keybindings.ts

@@ -64,10 +64,25 @@ export function useTextareaKeybindings() {
   return createMemo(() => {
     const keybinds = keybind.all
 
-    return [
-      { name: "return", action: "submit" },
-      { name: "return", meta: true, action: "newline" },
-      ...TEXTAREA_ACTIONS.flatMap((action) => mapTextareaKeybindings(keybinds, action)),
-    ] satisfies KeyBinding[]
+    // Get user-defined bindings first
+    const userBindings = TEXTAREA_ACTIONS.flatMap((action) =>
+      mapTextareaKeybindings(keybinds, action),
+    )
+
+    // Check if user has configured each action
+    const hasSubmitBinding = userBindings.some((b) => b.action === "submit")
+    const hasNewlineBinding = userBindings.some((b) => b.action === "newline")
+
+    // Build defaults array, only adding defaults for unconfigured actions
+    const defaults: KeyBinding[] = []
+    if (!hasSubmitBinding) {
+      defaults.push({ name: "return", action: "submit" })
+    }
+    if (!hasNewlineBinding) {
+      defaults.push({ name: "return", meta: true, action: "newline" })
+    }
+
+    // User bindings come first so they take precedence over defaults
+    return [...userBindings, ...defaults] satisfies KeyBinding[]
   })
 }