fix(web): standardize modal button layout across all dialog modals

Apply symmetrical full-width button pattern to:
- Delete Identity dialog (ConnectedInstances)
- Transfer Ownership confirmation
- Image Crop modal

packages/web/src/components/modals/TransferOwnershipModal.tsx

@@ -94,10 +94,10 @@ export function TransferOwnershipModal({ spaceId, onClose }: { spaceId: string;
               </p>
               <p className="text-xs text-txt-tertiary mt-1.5">You will become a regular member.</p>
             </div>
-            <div className="flex gap-2 justify-end">
+            <div className="flex gap-3">
               <button
                 onClick={() => setSelectedUserId(null)}
-                className="px-3 py-1.5 text-sm text-txt-secondary hover:text-txt-primary transition-colors"
+                className="flex-1 py-2.5 text-sm font-medium text-txt-secondary bg-interactive-hover hover:bg-interactive-selected rounded-lg transition-colors disabled:opacity-50"
                 disabled={transferring}
               >
                 Cancel
@@ -105,7 +105,7 @@ export function TransferOwnershipModal({ spaceId, onClose }: { spaceId: string;
               <button
                 onClick={handleTransfer}
                 disabled={transferring}
-                className="px-3 py-1.5 bg-accent-amber hover:bg-accent-amber/80 text-white text-sm font-medium rounded transition-colors disabled:opacity-50"
+                className="flex-1 py-2.5 bg-accent-amber hover:bg-accent-amber/80 text-white text-sm font-medium rounded-lg transition-colors disabled:opacity-50"
               >
                 {transferring ? 'Transferring...' : 'Transfer'}
               </button>