feat(gui): make every panel collapsed by default

Author: namvdo

frontend/src/components/sidebar/GeometricOffsetsPanel.tsx

@@ -104,7 +104,7 @@ export const GeometricOffsetsPanel = ({
   };
 
   return (
-    <Collapsible title="Geometric offsets" defaultOpen={true}>
+    <Collapsible title="Geometric offsets" defaultOpen={false}>
       <div className="geometric-offset-context">
         <span>Geometric distance ε<sub>g</sub></span>
         {Number.isFinite(systemEpsilon) && (

frontend/src/components/sidebar/ManifoldsPanel.tsx

@@ -61,7 +61,7 @@ export const ManifoldsPanel = ({
   ).sort((a, b) => a - b);
 
   return (
-    <Collapsible title="Manifolds" defaultOpen={true}>
+    <Collapsible title="Manifolds" defaultOpen={false}>
       {candidateOrbits.length > 0 && (
         <div className="start-field" style={{ marginBottom: '12px' }}>
           <label htmlFor="manifold-orbit-source">Orbit source (saddles & dual repellers)</label>

frontend/src/components/sidebar/ParametersPanel.tsx

@@ -39,7 +39,7 @@ export const ParametersPanel = ({
   const isContinuous = systemId === 'duffing_ode' || systemId === 'custom_ode';
 
   return (
-    <Collapsible title="Parameters" defaultOpen={true}>
+    <Collapsible title="Parameters" defaultOpen={false}>
       {presets.length > 0 && (
         <div className="presets">
           {presets.map(p => (

frontend/src/components/sidebar/PeriodicOrbitsPanel.tsx

@@ -83,7 +83,7 @@ export const PeriodicOrbitsPanel = ({
   const higherPeriodSolutions = periodicOrbits.filter(orbit => orbit.period > 1);
 
   return (
-    <Collapsible title="Periodic orbits" defaultOpen={true}>
+    <Collapsible title="Periodic orbits" defaultOpen={false}>
       <Toggle
         label="Orbit markers"
         checked={manifoldState.showOrbits}

frontend/src/components/sidebar/PeriodicSearchPanel.tsx

@@ -105,7 +105,7 @@ export const PeriodicSearchPanel = ({
   ))?.id ?? null;
 
   return (
-    <Collapsible title="Periodic search" defaultOpen={true}>
+    <Collapsible title="Periodic search" defaultOpen={false}>
       <p className="periodic-search-intro">
         Find boundary-map periodic orbits with Newton solves seeded across position and unit-normal angle.
       </p>

frontend/src/components/sidebar/StartingPoint.tsx

@@ -61,7 +61,7 @@ export const StartingPoint = ({ type, startPoint, updateStartPoint, disabled = f
   };
 
   return (
-    <Collapsible title="Extended start state" defaultOpen={true}>
+    <Collapsible title="Extended start state" defaultOpen={false}>
       <div className="start-group-label">Position</div>
       <div className="start-grid">
         <div className="start-field">

frontend/src/components/sidebar/VisualizationPanel.tsx

@@ -11,7 +11,7 @@ interface VisualizationPanelProps {
 export const VisualizationPanel = ({ viewRange, setViewRange, rangeLimit, resetViewRange }: VisualizationPanelProps) => {
   const limitLabel = rangeLimit ?? 10;
   return (
-    <Collapsible title="Axis range" defaultOpen={true}>
+    <Collapsible title="Axis range" defaultOpen={false}>
       <div className="axis-range-grid">
         <div className="axis-range-row">
           <span className="axis-range-label">x</span>