Use unprefixed hook name in scope error message

The scope error message now uses the display name alias (e.g. worldInputs)
instead of the internal shader function name (e.g. getWorldInputs).
This matches the primary API that users interact with via begin()/end().

Also added a unit test verifying the error uses the unprefixed name.

Author: BHARATH0153

src/strands/strands_api.js

@@ -809,16 +809,20 @@ export function createShaderHooksFunctions(strandsContext, fn, shader) {
     if (argIdx >= 0) {
       const structParam = hookType.parameters[argIdx];
       if (structParam.type.properties) {
+        const nameMatch = /^get([A-Z0-9]\w*)$/.exec(hookType.name);
+        const displayName = nameMatch
+          ? nameMatch[1][0].toLowerCase() + nameMatch[1].slice(1)
+          : hookType.name;
         for (const prop of structParam.type.properties) {
           const key = prop.name;
           Object.defineProperty(hook, key, {
             get() {
               if (!this._active) {
                 FES.userError(
                   'scope error',
-                  `It looks like you're trying to access "${hookType.name}.${key}" outside of its begin()/end() block.\n\n` +
-                  `Properties of ${hookType.name} are only available between ` +
-                  `${hookType.name}.begin() and ${hookType.name}.end().\n\n` +
+                  `It looks like you're trying to access "${displayName}.${key}" outside of its begin()/end() block.\n\n` +
+                  `Properties of ${displayName} are only available between ` +
+                  `${displayName}.begin() and ${displayName}.end().\n\n` +
                   `To share data between hooks, use sharedVec3() or sharedFloat() ` +
                   `to pass values between them.`
                 );
@@ -829,7 +833,7 @@ export function createShaderHooksFunctions(strandsContext, fn, shader) {
               if (!this._active) {
                 FES.userError(
                   'scope error',
-                  `It looks like you're trying to set "${hookType.name}.${key}" outside of its begin()/end() block.`
+                  `It looks like you're trying to set "${displayName}.${key}" outside of its begin()/end() block.`
                 );
               }
               this._args[this._argIdx][key] = val;

test/unit/webgl/p5.Shader.js

@@ -2759,5 +2759,26 @@ test('returns numbers for builtin globals outside hooks and a strandNode when ca
         }, { myp5 });
       });
     });
+
+    test('scope error uses unprefixed hook name', () => {
+      myp5.createCanvas(50, 50, myp5.WEBGL);
+
+      try {
+        myp5.baseMaterialShader().modify(() => {
+          myp5.getWorldInputs.begin();
+          myp5.getWorldInputs.end();
+          const pos = myp5.getWorldInputs.position;
+        }, { myp5 });
+      } catch (e) { /* expected */ }
+
+      assert.isAbove(mockUserError.mock.calls.length, 0, 'FES.userError should have been called');
+      const scopeCall = mockUserError.mock.calls.find(call => call[0] === 'scope error');
+      assert.isDefined(scopeCall, 'scope error should have been called');
+      const errMsg = scopeCall[1];
+      assert.include(errMsg, 'worldInputs');
+      assert.notInclude(errMsg, 'getWorldInputs');
+      assert.include(errMsg, 'begin()');
+      assert.include(errMsg, 'end()');
+    });
   });
 });