docs: update task-4 builder exploration notes

Week-1/Task-4/thob/notes.md

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+# Builder Exploration Notes — Task 4: Click To Toggle Visual State
+
+## Capability Gap Identified
+
+- **Click Interaction Behavior**:
+  - `onClick` trigger is available in the UI, but did not produce visible state changes during testing
+  - Interaction execution appears inconsistent or unclear
+
+- **State Management**:
+  - No visible support for defining or managing state variables (e.g., boolean toggle)
+  - No clear mechanism to store or switch between visual states
+
+- **Visual State Transition**:
+  - Unable to toggle between two visual states (e.g., color change)
+  - Object remains in default appearance despite interaction attempts
+
+---
+
+## Observations
+
+- Interaction system UI is present but lacks clear connection between events and property updates
+- No built-in concept of "state" for managing toggles
+- Event-to-property binding is not intuitive or not functioning as expected
+
+---
+
+## Comparison vs Code
+
+- **Vanilla**:
+  - Requires raycasting + manual state handling
+  - Fully flexible but verbose
+
+- **R3F**:
+  - Simple toggle using `onClick` + `useState`
+  - Very clean and reliable
+
+- **Thob**:
+  - Click interaction present in UI
+  - Toggle behavior could not be achieved during testing
+
+---
+
+## Key Insight
+
+The builder currently lacks a clear state management system and reliable event-to-property binding, making it difficult to implement toggle-based interactions.
+
+---
+
+## Product Perspective
+
+Toggle interactions are essential for use cases like product configurators (e.g., switching colors, enabling features). Without reliable state handling, these use cases are difficult to implement.
+
+---
+
+## Improvement Recommendations
+
+1. **State Management UI**  
+   - Introduce simple state variables (e.g., `isActive`, `isSelected`)
+
+2. **Property Binding System**  
+   - Allow material properties (color, visibility, etc.) to be linked to state variables
+
+3. **Reliable Event Execution**  
+   - Ensure `onClick` triggers consistently update state and reflect changes in the UI
+
+---
+
+## Verdict
+
+Strong for **static visual configuration**  
+Limited for **state-driven interactions (toggle, dynamic behavior)**