fix: move sidebar context to separate file

[olivermrose]

sveltejs/svelte#8655

[Copilot]

Pull request overview

This PR refactors the sidebar context management by extracting it from the Sidebar.svelte component into a dedicated context.ts file. This addresses issue #8655 and improves code organization by separating context logic from component implementation.

Key Changes:

• Created a new context.ts file that exports the SidebarContext interface and context getter/setter functions
• Updated all components to import the context from the centralized location

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/lib/context.ts	New file defining the SidebarContext interface and exporting context getter/setter functions using Svelte 5's createContext API
src/lib/components/Sidebar.svelte	Removed the module script block containing context definition, now imports context setter and type from $lib/context
src/lib/components/StreamTooltip.svelte	Updated import to use getSidebarContext from $lib/context instead of Sidebar.svelte
src/lib/components/ChannelListItem.svelte	Updated import to use getSidebarContext from $lib/context instead of Sidebar.svelte
src/lib/components/ChannelList.svelte	Updated import to use getSidebarContext from $lib/context instead of Sidebar.svelte

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