Expand chronicle to 300 entries with world data

Add a generator script that produces the entries dataset, dedupe
entries sharing coordinates, and ship world city and country
GeoJSON assets for the globe view.

Make the timeline card spacing derive from entry count, move the
view switcher into the bottom bar, and align card and label fonts
with the timeline titles.

src/utils/labels.js

@@ -45,7 +45,7 @@ export function makeTextSprite(text, {
   stroke = 'rgba(20,12,6,0.9)',
   strokeWidth = 6,
   padding = 24,
-  font = 'Georgia, "Noto Serif SC", serif',
+  font = '"Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif',
   weight = '600',
   scale = 1,            // 单行文字的精灵世界高度
   maxWidth = Infinity,  // 精灵世界最大宽度，超宽则居中换行