[CustomCatalog] Surface sanitizeCatalogImageUrl in the bundled d.ts

[claude]

Notes for Reviewers

sanitizeCatalogImageUrl (added for the catalog snapshot-URL sanitization work) ships at runtime but reaches the package entry only through export * from './custom' nested barrels. rollup-plugin-dts — the tsup declaration bundler — drops such symbols from the published dist/index.d.ts, so consumers importing it type-fail with TS2305: Module '@sistent/sistent' has no exported member 'sanitizeCatalogImageUrl' even though the runtime export exists. This is the same nested-barrel quirk already documented in src/index.tsx for FeedbackButton, TableActions, DangerConfirmationModal and UniversalFilter.

This PR:

• Extracts sanitizeCatalogImageUrl into a dependency-free leaf module (src/custom/CustomCatalog/sanitizeCatalogImageUrl.ts). Re-exporting it directly from Helper.ts would drag that module's untyped js-yaml import into the declaration graph and crash the dts build — the same rationale that keeps getCopyDeepLinkAction/TableAction in the leaf TableActions module rather than ResponsiveDataTable.
• Adds an explicit export { sanitizeCatalogImageUrl } from './custom/CustomCatalog/sanitizeCatalogImageUrl' to src/index.tsx, forcing the declaration into the bundled dist/index.d.ts.
• Helper.ts re-exports from the leaf so the existing from './Helper' import path keeps working for internal consumers (CatalogCardDesignLogo, CustomCatalog/index).

Verification: NODE_ENV=production tsup builds clean and dist/index.d.ts now declares sanitizeCatalogImageUrl: (rawUrl?: string) => string | undefined and lists it in the export barrel; the sanitizeCatalogImageUrl Jest suite passes. Once released, downstream consumers can drop their local .d.ts shim for this symbol and import it type-safely.

Signed commits

• Yes, I signed my commits.

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