fix(docs): Allow bracket notation in repo paths

[sentry]

This PR addresses issue TANSTACK-COM-51A by updating the REPO_PATH_SEGMENT_PATTERN regex in src/utils/repo-path.ts.

Previously, the regex did not include [ and ], causing validation errors when users navigated to example files that utilize Svelte file-system routing conventions (e.g., src/routes/[postId]/+page.ts). This resulted in an "Error: [" being thrown.

The fix modifies the regex to ^[a-zA-Z0-9._$+\[\]-]+$ to correctly allow these characters. A corresponding test case has also been added to tests/repo-path.test.ts to ensure paths with bracket notation are now considered valid.

Fixes TANSTACK-COM-51A

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