feat(memory-location): add initial location state support

[astakhovaskold]

Summary

Adds initial state support to memoryLocation, so tests and custom in-memory routing setups can seed the current location state and read it back from the returned object.

This change keeps the API small:

• memoryLocation({ path, state }) now accepts an initial state
• navigate(..., { state }) updates that state
• the current value is exposed as memory.state

The value is intentionally exposed on the memoryLocation(...) result object rather than as a destructured snapshot, so it always reflects the latest navigation state.

Changes

• added state option to memoryLocation
• stored and updated current in-memory location state alongside path/search
• made reset() restore the initial state as well as the initial path
• updated TypeScript declarations for both wouter and wouter-preact
• added runtime and type coverage for the new API

Testing

• bun test packages/wouter/test/memory-location.test.ts
• bun test-types

Closes #492

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[molefrog]

Two small inline notes on navigate and reset.

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Generated by Claude Code

[molefrog]

Thanks, planning this for the next release