[graph/canvas] refactor: graph theme naming overhaul#670
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closes #657
Restructures the theme API under a single canvas.theme namespace and tightens up naming throughout.
What changed
getTheme, themeMap, baseTheme, activeThemePreset, and useTheme are now grouped under canvas.theme as _resolveToken, _overrides, base, activePreset, and createLayer
useTheme.ts → createLayer.ts, getThemeResolver.ts → createTokenResolver.ts
ValidGraphThemePath → ThemeToken, FullThemeMap → ThemeOverrides, ThemeMapEntry → ThemeOverride
resolveThemeForNode / resolveThemeForEdge → getNodeStyles / getEdgeStyles
Layer controls shortened: setTheme / removeTheme / removeAllThemes → set / remove / removeAll
Background pattern drawing moved from the product layer (useGraphWithCanvas) into useCanvasPlugin where it belongs
Added a naming conventions glossary to types.ts (StyleValue / ThemeValue / ThemeToken)
Why
The old API was a flat bag of loosely related fields on canvas. Grouping them under canvas.theme makes the surface discoverable and draws a clear line between what plugins can use internally (_resolveToken, _overrides) and what consumers should reach for (createLayer). The full public read API for product code is tracked in #574.