feat(feedback): implement ChipDip-style floating dev feedback & bug report widget with markdown sync

app/database.py

@@ -433,6 +433,24 @@ def _migrate(conn: sqlite3.Connection):
     """)
     conn.execute("CREATE INDEX IF NOT EXISTS idx_lesson_sess_user_date ON lesson_sessions(user_id, completed_at DESC);")
 
+    # Ensure feedback_reports table exists (User In-App Bug & Feature Tracker)
+    conn.execute("""
+    CREATE TABLE IF NOT EXISTS feedback_reports (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        user_id INTEGER NOT NULL,
+        category TEXT NOT NULL DEFAULT 'bug',
+        message TEXT NOT NULL,
+        context_url TEXT DEFAULT '',
+        context_data_json TEXT DEFAULT '{}',
+        status TEXT NOT NULL DEFAULT 'new',
+        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+    );
+    """)
+    conn.execute("CREATE INDEX IF NOT EXISTS idx_feedback_user ON feedback_reports(user_id);")
+    conn.execute("CREATE INDEX IF NOT EXISTS idx_feedback_status ON feedback_reports(status);")
+
     # Repair legacy cards with placeholder blanks or mismatched context
     repair_mismatched_cefr_contexts(conn)