fix(docs): Allow square brackets in repo paths for dynamic routes

[sentry]

This PR addresses an issue where SvelteKit and Next.js dynamic route filenames, which use square brackets (e.g., [postId]), were being rejected by the isValidRepoPath validation.

The REPO_PATH_SEGMENT_PATTERN regex in src/utils/repo-path.ts did not include [ or ], leading to a validation error when the example viewer attempted to load source files like examples/svelte/ssr/src/routes/[postId]/+page.svelte.

Changes Made:

• Updated REPO_PATH_SEGMENT_PATTERN in src/utils/repo-path.ts to include [ and ] characters.
• Added a new test case in tests/repo-path.test.ts to specifically validate paths containing square-bracket segments, ensuring the fix works as expected and preventing regressions.

This change is safe as existing path traversal defenses remain intact, and it aligns with the precedent of allowing other special characters like $ in repo paths.

Fixes TANSTACK-COM-2Q9

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	tanstack-com	7f96347	Commit Preview URL Branch Preview URL	Sep 14 2026, 11:05 PM

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[tannerlinsley]

This bracket-path fix already shipped in #1288 (a9c6ee7), including regression coverage. I also ran the exact +page.svelte path from this PR against the current validator and it passes; traversal, empty path segments, and query delimiters are still rejected. Closing this duplicate. #1238 additionally allows route-group parentheses, which is a separate change and remains open.