fix: remove unused gt-i18n internal entrypoints

[eoinest]

Summary

• remove unused JSX helper functions from gt-i18n internals
• stop exporting translation helper implementations from gt-i18n/internal except createLookupOptions
• remove the gt-i18n/fallbacks package entrypoint while keeping fallback functions on the main entrypoint

Testing

• pnpm --filter gt-i18n test
• pnpm build
• pnpm lint

No changeset added per request.

Greptile Summary

This PR cleans up the gt-i18n package by removing two redundant public API surfaces: the gt-i18n/fallbacks sub-entrypoint (whose exports already live on the main index) and the six resolve-helper function exports from gt-i18n/internal. The change is internally consistent across all affected layers — build config, package.json exports, source files, and tests all align.

• Deletes src/fallbacks.ts and all references to the ./fallbacks entrypoint; gtFallback and mFallback remain accessible via the main gt-i18n import.
• Narrows gt-i18n/internal to export only createLookupOptions from helpers.ts; resolveJsx and resolveJsxWithFallback are fully removed from source, while the remaining resolve helpers are kept as package-internal utilities.
• Removes the corresponding size-limit entry and build target for fallbacks.

Confidence Score: 5/5

Safe to merge — all changes are removals of redundant or unused exports, and every layer (build config, package.json, source, tests) is updated consistently.

The diff is a pure subtraction: no new logic is introduced, the deleted functions were unused externally, and the fallback functions remain accessible on the main entrypoint. The build config, exports map, size-limit config, and test file all agree with the source changes.

No files require special attention.

Important Files Changed

Filename	Overview
.size-limit.cjs	Removes the gt-i18n/fallbacks entry from size-limit checks, consistent with removing that entrypoint.
packages/i18n/package.json	Removes the ./fallbacks export entry, its typesVersions entry, and the gt-i18n/fallbacks path alias. Consistent with the deleted fallbacks.ts entry file.
packages/i18n/src/fallbacks.ts	File deleted. Both gtFallback and mFallback are already re-exported from the main index.ts, so the dedicated entrypoint was redundant.
packages/i18n/src/internal.ts	Stops re-exporting resolve helper functions from gt-i18n/internal, retaining only createLookupOptions. Narrowing of the public API surface.
packages/i18n/src/translation-functions/internal/helpers.ts	Deletes resolveJsx and resolveJsxWithFallback; remaining functions (resolveJsxWithRuntimeFallback, resolveStringContent, etc.) are kept for internal use but no longer re-exported from the package boundary.
packages/i18n/src/translation-functions/internal/tests/helpers.test.ts	Removes tests for the deleted resolveJsx function; remaining tests import directly from helpers.ts and are unaffected.
packages/i18n/tsdown.config.mts	Removes src/fallbacks.ts from the list of build entry points, matching the package.json export removal.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    subgraph Before
        A[gt-i18n] -->|main index| B[gtFallback / mFallback / t / msg / ...]
        A -->|gt-i18n/fallbacks| C[gtFallback / mFallback]
        A -->|gt-i18n/internal| D[createLookupOptions\nresolveJsx\nresolveJsxWithFallback\nresolveJsxWithRuntimeFallback\nresolveStringContent\nresolveStringContentWithFallback\nresolveStringContentWithRuntimeFallback\n...]
    end

    subgraph After
        E[gt-i18n] -->|main index| F[gtFallback / mFallback / t / msg / ...]
        E -->|gt-i18n/internal| G[createLookupOptions\n...]
    end

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flowchart TD
    subgraph Before
        A[gt-i18n] -->|main index| B[gtFallback / mFallback / t / msg / ...]
        A -->|gt-i18n/fallbacks| C[gtFallback / mFallback]
        A -->|gt-i18n/internal| D[createLookupOptions\nresolveJsx\nresolveJsxWithFallback\nresolveJsxWithRuntimeFallback\nresolveStringContent\nresolveStringContentWithFallback\nresolveStringContentWithRuntimeFallback\n...]
    end

    subgraph After
        E[gt-i18n] -->|main index| F[gtFallback / mFallback / t / msg / ...]
        E -->|gt-i18n/internal| G[createLookupOptions\n...]
    end

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