Switching share-link permission can copy a stale 'view' link

[Alimedhat000]

Problem

Changing ShareModeSelect triggers a refetch whose closure still holds the previous default 'view' (client/src/hooks/useShareLink.ts:15), racing the effect refetch (share-button.tsx:55-59). The displayed/copied URL can be a view token while the select shows Edit.

Fix

Derive the fetch from the current selection state synchronously (or cache links per-permission) so copied URLs always match the selected mode.

[Alimedhat000]

✅ Resolved by PR #78 (fix(client): stale 'view' share link when switching permission), merged to main via #87.

Verified on main: useShareLink(docId, permission, ...) now derives fetches from the current selection and refetches on permission change (share-button.tsx:61); copied URL always matches the selected mode.