feat(inflekt): re-export toKebabCase from komoji

[pyramation]

Summary

Adds toKebabCase to inflekt's re-exports from komoji in packages/inflekt/src/case.ts. This follows the existing pattern used for all other komoji case utilities (lcFirst, ucFirst, toPascalCase, toSnakeCase, toConstantCase). The motivation is to let codegen import toKebabCase from inflekt instead of depending on komoji directly.

Review & Testing Checklist for Human

• Verify that downstream codegen packages can switch their toKebabCase import from komoji to inflekt and that builds still pass
• Confirm no other direct komoji imports remain in codegen after the switch, so the dependency can actually be dropped

Notes

• No new logic — purely a re-export addition.
• All existing inflekt tests (88) pass. Build succeeds.

Link to Devin session: https://app.devin.ai/sessions/01424b7bd5a54c55acac65af34236896
Requested by: @pyramation

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