feat: migrate Sanity schemas to TypeScript

[devin-ai-integration]

Summary

Migrates the Sanity Studio schema files (sanity_ecommerce/schemas/) from JavaScript to TypeScript:

• Renamed product.js → product.ts, banner.js → banner.ts, schema.js → schema.ts (via git mv)
• Added type annotations to product.ts and banner.ts with explicit interfaces (SanitySchemaDefinition, SanityField, SanityFieldOptions)
• Created sanity_ecommerce/sanity.d.ts with declare module statements for Sanity v2 part: imports (part:@sanity/base/schema-creator and all:part:@sanity/base/schema-type)
• Updated sanity_ecommerce/tsconfig.json with proper compilerOptions for type-checking and included sanity.d.ts

No runtime behavior changes — Sanity v2 uses Babel for transpilation, so the tsconfig is used only for editor support and tsc --noEmit validation.

npx tsc --noEmit passes cleanly from the sanity_ecommerce/ directory.

Review & Testing Checklist for Human

• Verify Sanity Studio still starts/builds — run sanity start and sanity build inside sanity_ecommerce/ to confirm the Babel-based build isn't broken by the .ts renames. This is the most important check since CI may not cover the Sanity sub-project.
• Review duplicated interfaces — SanitySchemaDefinition, SanityField, and SanityFieldOptions are defined locally in both product.ts and banner.ts (with slight differences in SanityFieldOptions). Consider whether these should be extracted to a shared types file.
• tsconfig.json changes — the original config had a comment noting "compiler configuration here will be ignored" by Sanity v2. The new config adds real compilerOptions including ignoreDeprecations: "6.0" (needed for moduleResolution: "node" on TS 6.0+). Confirm this doesn't interfere with the Sanity build pipeline.

Notes

• schema.ts is a pure rename with no content changes — the part: imports are handled by the new sanity.d.ts ambient declarations.
• The declare module types use any for the Sanity v2 part imports, which is expected given Sanity v2's limited TS support.

Link to Devin session: https://app.devin.ai/sessions/a38d42803fa24db9948a850373cdcb26
Requested by: @WesternConcrete

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 2 additional findings.