wb.theme

getWorkbookTheme(): Promise<ThemeDefinition>;

Get the workbook's OOXML theme definition (color palette + fonts). Reads from Rust via bridge — async.

setWorkbookTheme(theme: ThemeDefinition): Promise<void>;

Set the workbook's OOXML theme definition. Writes to Rust via bridge — async. Triggers viewport palette invalidation so subsequent renders pick up the new theme colors.

getChromeTheme(): ChromeTheme;

Get the current chrome theme (canvas UI shell colors). Synchronous — TS-only, no Rust involvement.

setChromeTheme(theme: Partial<ChromeTheme>): void;

Set chrome theme with partial merge semantics. Merges the partial input with the **current** theme (not defaults). Triggers canvas layer re-render and CSS variable update. To reset to defaults, pass `DEFAULT_CHROME_THEME` explicitly.