Summary

Fixes broken navigation code examples across three docs pages so they match the real API in src/pythonnative/navigation.py.

Changes

• docs/getting-started.md: use_route() returns the params dict directly — removed the extra .params. indirection. Fixed Stack.Screen("Home", HomeScreen, ...) to use the required keyword-only component= argument.
• docs/guides/navigation.md: same Stack.Screen(...) keyword-argument fix, applied at all three occurrences (lines ~35-36, ~63-64, ~178-179).
• docs/examples/navigation.md: fixed route['params']['user_id'] → route['user_id'] (params dict is already unwrapped). Replaced the reference to nav.replace(...), which doesn't exist on the navigator handle, with nav.reset(...) — the correct method for resetting the stack.

Verification

• mkdocs build --strict completes with no errors related to these files.
• Manually ran the corrected getting-started.md snippet (HomeScreen/DetailScreen/App with use_route() and component=) against the installed package — imports and defines cleanly with no errors.

Fixes #36