fix pagingsource crash

[Tlaster]

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[Copilot]

Pull Request Overview

This PR fixes a PagingSource crash by refactoring the architecture to use a factory pattern for creating PagingSource instances. This addresses the issue where PagingSource instances were being reused across multiple Pager configurations, which can cause crashes in the Paging library.

• Replaces BaseTimelinePagingSource with BaseTimelinePagingSourceFactory that creates new instances
• Updates all implementations to use the factory pattern with lambda-based creation
• Improves error handling by throwing explicit exceptions instead of filtering null values

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
TimelinePresenter.kt	Updates timeline presenter to use factory pattern and call create() method
AccountRepository.kt	Replaces mapNotNull with explicit exception throwing for better error handling
GuestUserTimelinePagingSource.kt	Changes inheritance from BaseTimelinePagingSource to BasePagingSource
GuestTimelinePagingSource.kt	Changes inheritance from BaseTimelinePagingSource to BasePagingSource
GuestStatusDetailPagingSource.kt	Changes inheritance from BaseTimelinePagingSource to BasePagingSource
GuestSearchStatusPagingSource.kt	Changes inheritance from BaseTimelinePagingSource to BasePagingSource
GuestMastodonDataSource.kt	Wraps all PagingSource returns with BaseTimelinePagingSourceFactory
BaseRemoteMediator.kt	Defines new BaseTimelinePagingSourceFactory interface and removes old abstract class