fix: force rerender of pinned group

[olivermrose]

Found when debugging #163

Also disables dragging on the anchor tags since those were in the way.

[Copilot]

Pull request overview

This PR fixes the rerendering behavior of the pinned channels group and prevents anchor tags from interfering with drag-and-drop operations. The fix addresses an issue discovered while debugging #163.

Key Changes:

• Added draggable="false" to anchor tags in StreamTooltip to prevent interference with drag operations
• Refactored Draggable component props from spread pattern to explicit Props interface for better type safety
• Wrapped {#key} block around pinned channels to force rerender when pinned list length changes

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/lib/components/StreamTooltip.svelte	Added draggable="false" to anchor tag to prevent conflict with drag-and-drop functionality
src/lib/components/Draggable.svelte	Refactored component to use explicit Props interface and removed unused type imports, passing id and index as functions to useSortable
src/lib/components/ChannelList.svelte	Added {#key} block keyed on pinned array length to force recreation of draggable components when channels are added/removed from pinned list

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