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docs/PLAN.md

@@ -215,6 +215,12 @@ Each row is one review unit: build it, show it in the gallery, review, then move
 
 Deferred until a real need: Markdown/TextView, Dock, VirtualList, window-wide text selection, a motion system (use gpui's built-in animations first), charts.
 
+### 6.1 After the core units: sizing API
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+Once the core components are done (units 1–10), add a **`Sizable` trait** so applications can customize component size, following gpui-kit's shape: a `Size` enum (`XSmall` / `Small` / `Medium` default / `Large`, plus a custom `Pixels` variant) and `with_size(impl Into<Size>)` with `xsmall()` / `small()` / `large()` conveniences.
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+Our divergence from gpui-kit: the per-size metrics (control heights, paddings, text sizes, knob/indicator diameters) resolve from the **theme**, not from constants in the component layer — they are native-metric values (§5.5) and every component already reads its metrics through tokens. Implementation shape: the theme gains a size-class table (`Size` → control height/padding/text metrics), and each control implements `Sizable` by reading that table at paint time. Retrofits land one component per unit (Button first, as the API template) with the trait living in the ungated `common` module.
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 ## 7. Milestones
 
 | Phase | Scope | Acceptance |