* fix: de-duplicate model tags case-insensitively
This change updates the `setTags` function in the `Models.svelte` component and the `onMount` function in the `Selector.svelte` component to convert all model tags to lowercase before removing duplicates. This ensures that tags with different capitalization (e.g., "Best" and "best") are treated as a single tag, preventing duplicate entries in the tag filter dropdown on both the workspace models page and the new chat page.
* Update Selector.svelte
* refac
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