Salah 0.5: defer center resizing until scrolling stops

README.md

@@ -19,22 +19,24 @@ Morocco (Ministry of Habous), matching AlAdhan `method=21`:
 All computation happens **on the watch** — no GPS, no network. Pure solar math
 (same Meeus approach as the sundial) lives in `src/common/prayer.js`.
 
-## Screen (v0.4)
+## Screen (v0.5)
 
-- Pure #000000 AMOLED background
-- Larger 50px clock; no swipe instruction label
+- Pure #000000 AMOLED background, large 50px clock, no swipe hint
 - Prayer names above their times, in fixed 104px native list rows
-- Center magnification: prayer times grow continuously from 30px to 60px as
-  their row approaches the physical screen center; names grow from 20px to 28px
-- Scroll viewport 320×264 at x73/y101, centered at y233; 80px end spacers
-- Fixed next-prayer countdown below the list; lavender next-prayer highlight
-- Glyph sizes change without changing row heights, avoiding scroll-position drift
-- 15s clock refresh preserves scroll focus; calculation logic unchanged
-- Normal system back exits; crown support not assumed
+- After scrolling stops, the nearest-center prayer gets a 60px time and 28px
+  label; other rows use 30px times and 20px labels
+- No font resizing or row-array replacement during gesture/inertial scrolling
+- Duplicate stop notifications do not repaint unchanged focus; periodic refresh
+  defers while scrolling and resumes normally after hiding/showing the app
+- Scroll viewport 320×264 at x73/y101 (center y233); 80px end spacers
+- Fixed countdown below the list; lavender next-prayer highlight
+- Normal system back exits; calculation logic unchanged
 
-Automated math/page/focus/layout tests and release build pass. The live scroll
-magnification still needs an on-watch check. `preview-0.4.png` is a static layout
-mock with illustrative times, not a device screenshot.
+User reported watch lag in v0.4. A 500-event VM replay measured 500 row-array
+replacements in v0.4 versus zero during scrolling in v0.5. This verifies reduced
+update work, NOT device frame rate. All automated tests and release build pass;
+on-watch smoothness still needs confirmation. `preview-0.4.png` remains an
+illustrative static layout mock; the settled appearance is unchanged.
 
 ## Project layout
 
@@ -61,6 +63,7 @@ node tests/prayer.cjs
 node tests/page.cjs
 node tests/amoled.cjs
 node tests/focus.cjs
+node tests/scroll-performance.cjs
 ```
 
 ## Install