Update frontend sample questions to match STEM-only benchmark and neutral category

frontend/src/App.jsx

@@ -12,28 +12,50 @@ const samples = {
     "I'm looking at this cell diagram and I can't tell the difference between the cell wall and the cell membrane.",
     "Our teacher said the Earth is tilted, but how does that make summer and winter? It doesn't make sense.",
     "Is a virus alive or is it not? My textbook says both and I'm really mixed up.",
-    "What is the difference between a variable and a constant in algebra? I'm lost."
+    "What is the difference between a variable and a constant in algebra? I'm lost.",
+    "Why does dividing by a fraction mean multiplying by its reciprocal? It seems arbitrary.",
+    "What is the difference between speed and velocity? They sound like the same thing.",
+    "Why is the mitochondria called the powerhouse of the cell? What does it actually do?"
   ],
   frustration: [
-    "I've reread this history chapter about the constitution three times and I still don't understand it! This is so annoying!",
+    "I've tried to solve this quadratic equation three times using the formula, but I keep getting a negative under the square root!",
     "My science experiment failed again! The volcano didn't bubble at all and I did everything exactly right!",
     "This long division with decimals is taking forever and I keep getting the wrong remainder! I hate this!",
-    "I'm trying to write this paragraph about Shakespeare but I have absolutely no idea what to write. I give up!",
-    "Why is English spelling so weird? These rules make no sense and I keep failing my vocabulary checks!"
+    "This word problem about two trains leaving different cities is making my head spin. I hate word problems!",
+    "I don't understand how to convert grams to moles. I keep getting the wrong conversion factor and it's so frustrating!",
+    "I've tried balancing this chemical equation five times and the numbers never match up!",
+    "Im trying to draw this ray diagram for a concave lens and the lines are crossing in the wrong place. I give up!",
+    "This physics problem about friction has too many variables and I don't even know where to start!"
   ],
   boredom: [
     "Ugh, why do we have to learn about sedimentary rocks? They just sit there. Who cares?",
     "This math worksheet is just 50 of the same exact addition problems. This is so boring.",
-    "Reading about the ancient Egyptians is okay, but copying these definitions is putting me to sleep.",
-    "We are just sitting here listening to a long lecture about grammar. When do we get to do something fun?",
-    "I finished all my science reading early. There's nothing else to do except stare at the wall."
+    "We are just copying definitions of different math properties from the board. This is so boring.",
+    "Another lecture on the phases of mitosis... we've covered this three years in a row now.",
+    "I finished all my science reading early. There's nothing else to do except stare at the wall.",
+    "We have to measure the temperature of this water every two minutes for an hour. This is so tedious.",
+    "Calculating the area of twenty slightly different rectangles is putting me to sleep.",
+    "This lecture on cell organelles is just slides of definitions. I'm falling asleep."
   ],
   confidence: [
     "I totally mastered multiplying fractions! Give me a hard practice problem to try!",
-    "I just finished writing my first short story in English and it has a really cool plot twist!",
-    "I know exactly why the American Revolution started. It was because of tax without representation!",
-    "I got a 100 on my spelling quiz today! I finally studied the right way!",
-    "I can explain the entire water cycle in my sleep! Evaporation, condensation, precipitation, easy!"
+    "I just derived the formula for the volume of a sphere all by myself!",
+    "I know exactly how to balance any redox reaction now. Try me!",
+    "I got a perfect score on the calculus midterm today! I really understand derivatives now!",
+    "I can explain the entire water cycle in my sleep! Evaporation, condensation, precipitation, easy!",
+    "I just solved the hardest logic puzzle in the workbook on my very first try!",
+    "I can calculate the trajectory of a projectile in my head now, it's so easy!",
+    "I fully understand how DNA replication works and could draw every step from memory!"
+  ],
+  neutral: [
+    "How do I calculate the hypotenuse of a right triangle when the sides are 3 and 4?",
+    "What are the three main types of rocks found in the Earth's crust?",
+    "Can you explain how photosynthesis converts sunlight into chemical energy?",
+    "What is the chemical formula for photosynthesis and cellular respiration?",
+    "How do you find the slope of a line from two points on a graph?",
+    "What is the difference between an isotope and an ion in chemistry?",
+    "Could you list the steps of the scientific method in order?",
+    "What is the value of the constant pi, and how is it calculated?"
   ]
 };