slow down accent glow pulse (0.08-0.20 speed, 5-9s lifetime) and tighten rune row spacing (LINE_H 3.8→2.8)

@@ -9,9 +9,9 @@99 }1010 1111 const FONT_SIZE = 14;12-// Wider row + column spacing so the visible rune count is ~40% of the13-// original spec — quieter, more deliberate drift. Opacity stays the same.14-const LINE_H = FONT_SIZE * 3.8;12+// Tighter row spacing — denser field of runes for a richer texture that13+// matches the Android RuneGridBackground's visual density.14+const LINE_H = FONT_SIZE * 2.8;1515 const CHAR_W = FONT_SIZE * 2.2;1616 // Three slow drift speeds (px/sec) — much quieter than the export canvas.1717 // Atmosphere, not focus.@@ -99,8 +99,8 @@9999       row: Math.floor(Math.random() * NUM_ROWS),100100       col: Math.floor(Math.random() * CHARS_PER_ROW),101101       phase: Math.random(),102-      speed: 0.4 + Math.random() * 0.4,103-      lifetime: 2000 + Math.random() * 3000,102+      speed: 0.08 + Math.random() * 0.12,103+      lifetime: 5000 + Math.random() * 4000,104104       age: 0,105105     });106106