feat(ui): 2.0.0-alpha.13 — finer per-card width scaling (12-col grid + -/+ stepper)

clock/weather etc. default to 1/6 width; sizes store an integer span 1-12
(legacy s/m/l still accepted by /api/dashboard/layout).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

CHANGELOG.md

@@ -3,6 +3,10 @@
 All notable changes to Void 2.0 are documented here.
 Format: [Keep a Changelog](https://keepachangelog.com).
 
+## 2.0.0-alpha.13 — Finer Sacred Valley tile scaling
+- Cards now sit on a 12-column grid with a per-card width **−/+ stepper** (span 1–12) in edit mode, replacing the coarse S/M/L. "Small" defaults to 1/6 width (half its previous size) so clock/weather aren't oversized.
+- Layout `sizes` now store an integer column span (legacy 's'/'m'/'l' still accepted).
+
 ## 2.0.0-alpha.12 — Editable Sacred Valley layout
 - "Edit layout" mode on the dashboard: per-card **resize** (S/M/L column span), **show/hide** (with a hidden-cards tray to re-add), clearer **drag-to-reorder** via a dedicated grip handle, and a **Reset** to defaults.
 - All changes persist through the existing `/api/dashboard/layout` (order/sizes/hidden) — no backend changes.