fix: address sharing system code issues

Commit notes

- Remove duplicate ShareDialog import in SampleEditDrawer.svelte - Fix incorrect $derived usage in ShareLinkCard.svelte (was returning function) - Fix incorrect $derived usage in UploadLinkCard.svelte (was returning function) - Remove redundant onMount in SharePermissions.svelte (already handled by $effect)

Co-authored-by: armin.naimi <[email redacted]>