fix: Expose cached PDF path to WebView to reduce loading delays

[syed-tp]

• To improve the user experience when viewing AI PDFs, cached files are now exposed to the WebView.
• This ensures faster loading by using locally stored PDFs instead of fetching them from remote URLs, reducing wait times and improving responsiveness.

[gemini-code-assist]

Summary of Changes

Hello @syed-tp, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This PR optimizes PDF loading in WebViews by exposing cached PDF paths via a new JavaScript interface. The AIChatPdfFragment now passes local PDF paths from DocumentViewerFragment to the WebView, enabling faster loading from local storage.

Highlights

• Intent: This pull request aims to improve the user experience when viewing AI PDFs by reducing loading delays. It achieves this by exposing locally cached PDF file paths to the WebView, allowing it to load PDFs from local storage instead of fetching them remotely.
• Changes: The changes introduce a new PDFPathInterface class that acts as a JavaScript interface for WebViews, providing methods to check if a PDF is cached (isPDFCached), get its absolute path (getCachedPDFPath), and retrieve its file name (getPDFFileName). The DocumentViewerFragment now includes a getCachedPdfPath() method to return the local path of a downloaded PDF. The AIChatPdfFragment has been updated to utilize this new functionality by importing PDFPathInterface, retrieving the cached PDF path from its parent DocumentViewerFragment, and then adding an instance of PDFPathInterface to the WebViewFragment under the name 'PDFHandler'. This allows the WebView to interact with the native Android code to determine and use locally stored PDF files.
• Reviewer Activity: No specific reviewer activity was provided in the context.

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[gemini-code-assist]

Code Review

Thank you for this contribution. The changes to expose the cached PDF path to the WebView for faster loading are a great user experience improvement. I've reviewed the code and have a few suggestions to improve maintainability and code quality. My comments focus on reducing coupling, eliminating magic strings, and simplifying the code. Please take a look at the detailed comments.