Fix minimal TUI submitted-line duplicate appearance

docs/plans/state.json

@@ -3,6 +3,18 @@
   "updated_at": "2026-02-23",
   "description": "Tracks the status of all Flynn plans and implementation phases",
   "plans": {
+    "minimal-tui-submitted-line-dedupe": {
+      "status": "completed",
+      "date": "2026-02-23",
+      "updated": "2026-02-23",
+      "summary": "Fixed duplicate-looking user messages in minimal TUI by clearing the just-submitted readline prompt line before rendering the timestamped `You` block, so sent content is shown once in the conversation transcript.",
+      "files_modified": [
+        "src/frontends/tui/minimal.ts",
+        "src/frontends/tui/minimal.test.ts",
+        "docs/plans/state.json"
+      ],
+      "test_status": "pnpm test:run src/frontends/tui/minimal.test.ts passing"
+    },
     "dashboard-local-backend-update-actions": {
       "status": "completed",
       "date": "2026-02-23",
@@ -6010,7 +6022,7 @@
     }
   },
   "overall_progress": {
-    "total_test_count": 1941,
+    "total_test_count": 1942,
     "all_tests_passing": true,
     "p0_completion": "3/3 (100%)",
     "p1_completion": "4/4 (100%)",