Document v0.8.8 internal refactors in README

Author: bgeurten

README.md

@@ -98,6 +98,12 @@ New in v0.8.5:
 New in v0.8.7:
 - **Help** and **About** entries in the ⚙ Settings panel. Help is a one-screen reference covering the four tabs, the per-card buttons (±, ⏭, 🔄, ?), preset editing, and CSV export/import. About has version, source code link, live demo link, licence, and credit for free-exercise-db.
 
+New in v0.8.8 (internal — pure refactor, no behaviour change):
+- `render()` split into per-view functions (`renderHome`, `renderHistory`, `renderStats`, `renderBody`, `renderWorkout`, `renderPresetEditor`); the dispatcher is now ~14 lines instead of 435.
+- Two clickable `<span>` elements (preset edit overlay, preset-editor exercise name) are now real `<button>` elements with the appropriate style resets — keyboard navigation and screen readers now treat them correctly.
+- Chart geometry literals (`520`, `220`, padding values, range-padding ratios) and the autocomplete flip-up threshold are named constants with explanatory comments.
+- Three previously-undercommented functions (`rankBodyNames`, `reconstructInterval`, `openExerciseInfo`) now have short Why-comments.
+
 Zero dependencies, no build step. `localStorage` keys: `gym` (history), `gym_draft` (in-progress workout), `gym_shifts` (pending exercise shifts), `gym_presets` (preset definitions), `gym_ex_details` (cached exercise reference data, populated on first `?` click), `gym_body` (body measurements log), `gym_units` (display unit preference: `metric` / `imperial`), `gym_alternatives` (per-exercise list of remembered alternatives).
 
 ## Documentation