fix: Improve sanitizing for trickplay

[PartyDonut]

Pull Request Description

Possible unsanitized url for trickplays. Added the same logic to the sync provider

Issue Being Fixed

Resolves #116

Checklist

• [x] If a new package was added, did you ensure it works for all supported platforms? Is the package well maintained
• [x] Check that any changes are related to the issue at hand.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This PR improves URL sanitization in two areas: the sync provider's download URL construction and the trickplay URL handling. The changes implement proper URL parsing and construction using Uri class instead of simple string concatenation, making the URL handling more robust and secure.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Refactored download URL construction in sync provider to use Uri class	Replaced string concatenation with Uri constructor for proper URL formatting Added scheme detection (http/https) based on server URL Implemented proper query parameter handling for api_key Added explicit URL parsing for the final download string	lib/providers/sync_provider.dart
Enhanced trickplay URL processing with proper sanitization	Added URL sanitization for trickplay image lines Improved filtering of empty lines and comments Implemented proper URL parsing and string conversion for each line Streamlined the processing chain using functional operations	lib/providers/service_provider.dart

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#116	Fix the purple trickplay display issue caused by unsanitized URLs	✅

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