style(storybook): tidy CENTER, chart, org chart and SW story pages

- CENTER plain page layout and shorter reference demo notes (spec values
  moved to the CENTER README); chart specimen descriptions trimmed
- Org chart page names and previews; SW width rows follow the 30px frame
  margin (1980 / 1065 / 727px) and the SW tests match the current layout
- Story inventory regenerated and WORKING_CONTEXT updated

src/chart/radar-chart.stories.tsx

@@ -21,16 +21,16 @@ export const Radar: Story = {
       <ChartSampleNotice />
       {/* Two per row from 1024px, all four in one row from 1600px, one below. */}
       <StorySectionGrid className={chartGrid.quad}>
-        <ChartSpecimen title="Basic" description="영역">
+        <ChartSpecimen title="Basic">
           <HMRadarChart {...sampleRadar} label="단계별 처리 수준 방사형 차트(예시 데이터)" />
         </ChartSpecimen>
-        <ChartSpecimen title="Dot" description="축별 Dot">
+        <ChartSpecimen title="Dot">
           <HMRadarChart {...sampleRadar} dots label="단계별 처리 수준 방사형 차트, Dot(예시 데이터)" />
         </ChartSpecimen>
-        <ChartSpecimen title="Lines Only" description="선만">
+        <ChartSpecimen title="Lines Only">
           <HMRadarChart {...sampleRadar} filled={false} label="단계별 처리 수준 방사형 차트, 선만(예시 데이터)" />
         </ChartSpecimen>
-        <ChartSpecimen title="Custom Label" description="축 Label">
+        <ChartSpecimen title="Custom Label">
           <HMRadarChart {...sampleRadar} customLabels label="단계별 처리 수준 방사형 차트, 축 Label(예시 데이터)" />
         </ChartSpecimen>
       </StorySectionGrid>