fix(react): send a pageview when route is set without a path (#197)

[sarmah-rup]

What I hit

Using <Analytics route="/blog/[slug]" /> (a route, no path — the normal React Router / TanStack Router pattern), zero pageviews were tracked, silently. This is issue #197.

Why

The mount effect sets disableAutoTrack: true as soon as route is defined, turning off the script's own pageview tracking. But the manual pageview effect only fires when both route && path are truthy. So with a route and no path, auto-track is disabled and the manual call is skipped, so nothing is tracked, with no warning.

Fix

Fire the manual pageview whenever route is set (the exact condition under which auto-track was disabled), defaulting path to window.location.pathname when it is omitted. The Next.js and Remix wrappers always pass both, so they are unaffected.

Test

Added two cases to react/index.test.tsx: the route-without-path case now queues a pageview, and a both-provided regression guard. Verified fail before the fix / pass after against the real component.

Closes #197.

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