Migrate moduleResolution from "node" to "bundler" and remove ignoreDeprecations #723

Background

tsconfig.json currently uses moduleResolution: "node" (the legacy Node 10 strategy) with ignoreDeprecations: "5.0" to suppress the TypeScript deprecation warning.

The reason we cannot switch to "bundler" yet: rxfire uses subpath exports (e.g. rxfire/firestore, rxfire/auth), and the "bundler" resolution mode does not resolve these correctly with the current build setup.

Goal

Switch moduleResolution from "node" to "bundler" (or "node16" / "nodenext") and remove ignoreDeprecations.

Investigation needed

• Determine whether rxfire subpath import issues are a config problem (vite.config.ts / tsconfig paths) or a gap in rxfire's package.json exports map
• Check if rxfire has updated its exports map to be compatible with non-legacy resolution
• Evaluate "node16" as an intermediate step if "bundler" is not viable