fix(cli): repaint input area after inline /steer and /model submit (#34839)

handle_enter dispatches /steer and /model inline on the UI thread while
the agent is running, calling buffer.reset() then returning. Unlike every
other early-return branch in the handler, these two skipped
event.app.invalidate(). process_command() prints through patch_stdout
(scrolls output above the prompt without redrawing the input line), so the
just-cleared input area could keep showing the submitted '/steer <text>'
until an unrelated redraw fired — looking unsent and inviting an accidental
re-submit.

Add event.app.invalidate() after reset in both inline branches to match
the sibling branches. AST regression test pins the invariant: every
reset-then-return branch in handle_enter must invalidate first.

Fixes #34569

cli.py

@@ -12945,6 +12945,13 @@ class HermesCLI:
                         if event.app.is_running:
                             event.app.exit()
                     event.app.current_buffer.reset(append_to_history=True)
+                    # Force a repaint: process_command() prints through
+                    # patch_stdout (scrolls output above the prompt) and never
+                    # invalidates the app, so the just-cleared input area can
+                    # keep showing the submitted text until some unrelated
+                    # redraw fires. Every other early-return branch in this
+                    # handler invalidates after reset — match them.
+                    event.app.invalidate()
                     return
 
                 # Handle /steer while the agent is running immediately on the
@@ -12956,6 +12963,13 @@ class HermesCLI:
                 if self._should_handle_steer_command_inline(text, has_images=has_images):
                     self.process_command(text)
                     event.app.current_buffer.reset(append_to_history=True)
+                    # Force a repaint after clearing the buffer.  /steer is
+                    # dispatched mid-run while the agent streams output through
+                    # patch_stdout; process_command() never invalidates the
+                    # app, so without this the submitted "/steer <text>" can
+                    # linger in the input area (looking unsent) and invite an
+                    # accidental re-submit. See issue #34569.
+                    event.app.invalidate()
                     return
 
                 # Snapshot and clear attached images