Feature: Workspace Text Extraction & Full-Text Page Search

[YurMil]

Currently, the search bar in the toolbar only matches document names, page labels, or page numbers. For professional workflows, users need to search for text keywords inside the PDF pages themselves and filter or highlight the pages that contain those matches.

Technical Proposal:

1. In pdfjsReader.ts, add a helper to extract text from a page using:

   const textContent = await page.getTextContent();
   const textItems = textContent.items.map(item => item.str).join(" ");

2. Index this text content during document ingestion in ingest.worker.ts and add it to the page entity schema in types.ts.
3. Integrate a client-side search index (e.g., flexsearch or a simple keyword regex matcher) in the store selectors to filter the page grid.

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