feat: pinned channels

[olivermrose]

• Pinned channels stay at the top and can be ordered however you want
• Ephemeral channels are not allowed to be pinned

Because you're able to reorder pins, I'm closing #71 with this since the goal of that issue was to essentially pin channels.

Closes #71

[Copilot]

Pull request overview

This PR adds a pinned channels feature that allows users to pin channels to the top of the sidebar and reorder them via drag-and-drop. Ephemeral channels cannot be pinned, and the feature integrates cleanly with the existing channel grouping system.

Key Changes

• Added pinned state to the Channel model and settings store
• Implemented drag-and-drop reordering for pinned channels using @dnd-kit libraries
• Refactored sidebar components to use Svelte context for shared state (collapsed sidebar)
• Extracted channel rendering logic into reusable ChannelListItem component

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/lib/settings.ts	Added pinned array to track pinned channel IDs in settings
src/lib/models/channel.svelte.ts	Added pinned state property and initialization from settings
src/lib/menus/channel-menu.ts	Added pin/unpin toggle menu item with state management
src/lib/components/StreamTooltip.svelte	Refactored to use sidebar context and ChannelListItem component
src/lib/components/Sidebar.svelte	Added Svelte context for sharing sidebar collapsed state
src/lib/components/ChannelListItem.svelte	New component for rendering channel avatar and info consistently
src/lib/components/Draggable.svelte	New wrapper component for draggable pinned channels
src/lib/components/Droppable.svelte	New wrapper component for droppable pinned channels container
src/lib/components/ChannelList.svelte	Updated to support pinned channels group with drag-and-drop reordering
package.json	Added @dnd-kit dependencies for drag-and-drop functionality
pnpm-lock.yaml	Updated lock file with new dependencies

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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