Function createSignedUrlFromFileUrl

createSignedUrlFromFileUrl(
    fileUrl: string,
    expiresInSeconds: number,
    options: CreateSignedUrlFromFileUrlOptions,
): Promise<Safe<SignedUrlResult>>
Convenience helper: parse a Supabase storage URL (any variant — public, authenticated, or sign) into { bucket, path } and mint a signed download URL for it in one call.

Consolidates a pattern we previously duplicated across the generate-note mutation and the get-playback-url query. Both callers just had a file URL from our DB and needed a short-lived download URL back.
Parameters
- fileUrl: string
- expiresInSeconds: number
- options: CreateSignedUrlFromFileUrlOptions
Returns Promise<Safe<SignedUrlResult>>
Example
```
server-side (webhook, mutation)
  const result = await createSignedUrlFromFileUrl(fileUrl, 3600, {
    supabaseUrl: process.env.SUPABASE_URL!,
    apiKey: process.env.SUPABASE_SERVICE_ROLE_KEY!,
  });
```
Example
```
client-side (user-scoped)
  const result = await createSignedUrlFromFileUrl(fileUrl, 60, {
    supabaseUrl,
    apiKey: supabaseAnonKey,
    accessToken: userJwt,
  });
```
- Defined in packages/storage/src/createSignedUrlFromFileUrl.ts:51