fix: Reduce dynamic area to status before moving response to static

When streaming completes, we need to:
1. Reduce dynamic area to just the status line (not response + status)
2. Then write_static the response (which clears dynamic, writes, redraws)
3. Reset renderer so prompt can operate naturally

This prevents the response from being written twice (once as static,
once as redrawn dynamic content).

Also changed clear_dynamic to reset after completion - the status bar
remains visible until the next streaming starts, rather than leaving
blank lines where the cleared content was.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude-624482a1 <claude@v2.io>

Author: josephwecker

lib/autopax/commands/chat/interactive.rb

@@ -469,9 +469,12 @@ def send_message_simple_streaming(system_content)
       end
     end
 
-    # Move completed response to static region
+    # Move completed response to static region.
+    # First, reduce dynamic area to just status (so write_static doesn't redraw the response).
+    @renderer.write_dynamic(status_line)
     @renderer.write_static("[assistant] #{collected}\n")
-    @renderer.clear_dynamic
+    # Reset so the prompt can operate naturally (status remains visible until next streaming)
+    @renderer.reset
     collected
   end
 
@@ -534,8 +537,11 @@ def tool_turn_streaming(messages)
 
     # Move completed response to static region (if any text content)
     unless collected.empty?
+      # First, reduce dynamic area to just status (so write_static doesn't redraw the response)
+      @renderer.write_dynamic(status_line)
       @renderer.write_static("[assistant] #{collected}\n")
-      @renderer.clear_dynamic
+      # Reset so the prompt can operate naturally (status remains visible until next streaming)
+      @renderer.reset
     end
 
     [collected, done_event]