refactor(browse): frontend browse extraction and author query service

[alexhb1]

Description

Extracts the core of the BookQueryService into a generic browse query layer, and creates small book and author query services using this and the paginated endpoints.

Linked Issue

N/A - Part of the stack

Changes

• New browse-query service and related files - Generic tanstack query setup for any endpoints that follow the backend's browse system.
• Author and book query services set up as thin users of the browse layer, both identically set up, same models, pagination, facet, and tanstack query cache handling.

Manual Testing Steps

N/A

Screenshots (Optional)

N/A

Additional Context (Optional)

N/A

AI Disclosure

Mainly handled via Cursor to keep parity across book + authors and extract code into the shared browse files.

Checklist

• This PR links and implements an accepted issue.
• This PR is a single focused change.
• There are new or updated tests validating this change.
• I ran just ui check and just api check.
• I have added screenshots if there were any UI changes.
• I have disclosed any AI usage as per the organization AI Policy above.
• I understand all of my submitted changes.

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