fix(prompts): clamp invalid page query values

[Jorel97]

Summary

• clamps the public prompts list page query to a minimum of 1
• keeps invalid, zero, negative, or NaN page values from producing negative Supabase ranges

Fixes #298.

Verification

• Inspected src/app/api/prompts/route.ts and confirmed offset now derives from a positive page number.
• Full local test suite not run in this environment because the repo was updated through the GitHub API without a full dependency checkout.

[greptile-apps]

Greptile Summary

This PR fixes the public prompts listing endpoint so that malformed page query parameters (zero, negative, NaN, or non-numeric strings) no longer produce negative Supabase range offsets. The two-line change adds an explicit radix to parseInt and clamps the result to a minimum of 1 before computing the offset.

• parseInt now always uses radix 10, eliminating any implicit octal/hex parsing ambiguity.
• A Number.isFinite(parsedPage) && parsedPage > 0 guard falls back to page 1 for any out-of-range value, making the offset computation safe in all invalid-input cases.

Confidence Score: 5/5

Safe to merge — the change is a minimal, targeted guard on a single query parameter with no side-effects on other code paths.

The fix correctly handles all problematic inputs (zero, negative integers, NaN, non-numeric strings, and Infinity) and the offset computation is now guaranteed to be non-negative. Adding the explicit radix 10 to parseInt is also a correctness improvement. No existing behavior is altered for valid page values.

No files require special attention.

Important Files Changed

Filename	Overview
src/app/api/prompts/route.ts	Adds radix to parseInt and clamps parsed page value to ≥1, preventing negative Supabase range offsets from zero, negative, or non-numeric page query params.

Sequence Diagram

sequenceDiagram
    participant Client
    participant GET /api/prompts
    participant Supabase

    Client->>GET /api/prompts: GET ?page=<value>
    Note over GET /api/prompts: parsedPage = parseInt(page || "1", 10)
    Note over GET /api/prompts: page = isFinite(parsedPage) && parsedPage > 0 ? parsedPage : 1
    Note over GET /api/prompts: offset = (page - 1) * 20  [always >= 0]
    GET /api/prompts->>Supabase: .range(offset, offset + 19)
    Supabase-->>GET /api/prompts: { data, count }
    GET /api/prompts-->>Client: { listings, total, page, per_page }

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