feat(teleprompter): add teleprompter view

apps/client/src/common/components/view-params-editor/ParamInput.tsx

@@ -50,7 +50,13 @@ export default function ParamInput({ paramField }: ParamInputProps) {
   }
 
   if (type === 'boolean') {
-    return <ControlledSwitch id={id} initialValue={isStringBoolean(searchParams.get(id)) ?? defaultValue} />;
+    const paramValue = searchParams.get(id);
+    return (
+      <ControlledSwitch
+        id={id}
+        initialValue={paramValue === null ? Boolean(defaultValue) : isStringBoolean(paramValue)}
+      />
+    );
   }
 
   if (type === 'number') {

apps/client/src/common/components/view-params-editor/__tests__/viewParams.utils.test.ts

@@ -228,11 +228,41 @@ describe('getURLSearchParamsFromObj()', () => {
       },
     ];
     const params = {
-      bool1: 'off',
       bool2: 'on',
     };
     const result = getURLSearchParamsFromObj(params, mockOptionsWithBooleans);
     expect(result.get('bool1')).toBe('false');
     expect(result.get('bool2')).toBe('true');
   });
+
+  it('omits booleans which match their default', () => {
+    const mockOptionsWithBooleans: ViewOption[] = [
+      {
+        title: OptionTitle.StyleOverride,
+        options: [
+          {
+            id: 'onByDefault',
+            title: 'onByDefault',
+            description: 'On by default',
+            type: 'boolean',
+            defaultValue: true,
+          },
+          {
+            id: 'offByDefault',
+            title: 'offByDefault',
+            description: 'Off by default',
+            type: 'boolean',
+            defaultValue: false,
+          },
+        ],
+      },
+    ];
+
+    const untouched = getURLSearchParamsFromObj({ onByDefault: 'on' }, mockOptionsWithBooleans);
+    expect(untouched.toString()).toBe('');
+
+    const flipped = getURLSearchParamsFromObj({ offByDefault: 'on' }, mockOptionsWithBooleans);
+    expect(flipped.get('onByDefault')).toBe('false');
+    expect(flipped.get('offByDefault')).toBe('true');
+  });
 });

apps/client/src/common/components/view-params-editor/viewParams.utils.ts

@@ -155,6 +155,14 @@ export function getURLSearchParamsFromObj(paramsObj: ViewParamsObj, paramFields:
     });
   });
 
+  // Unchecked checkboxes are absent from FormData. Persist false when true is the default.
+  metadata.booleanFields.forEach((id) => {
+    if (id in paramsObj) return;
+    if (metadata.defaultValues[id] !== 'false') {
+      addUniqueParam(id, 'false');
+    }
+  });
+
   // Then process user-provided values
   Object.entries(paramsObj).forEach(([id, value]) => {
     if (typeof value === 'string' && value.length) {