chore(lint): apply eslint auto-fixes across the .tsx backlog

Mechanical --fix output over the newly linted .tsx files (indent,
arrow-parens, comma-dangle, member-delimiter-style, unnecessary type
assertions), plus the three generic-arrow test hooks converted to
function declarations up front: the comma-dangle fixer strips the
<T,> disambiguation comma and turns them into parse errors otherwise.

packages/client/ui-sidebar/tests/sidebar-root.spec.tsx

@@ -26,7 +26,7 @@ function mountShell({ collapsed = false, width = 300 }: { collapsed?: boolean; w
       startSession={startSession} toggleSidebar={toggleSidebar}
       renderSlot={((key: string, owner: SidebarSectionOwnerProps | SidebarSettingsOwnerProps) => {
         if (key === 'sidebar.settings') {
-          settingsOwner = owner as SidebarSettingsOwnerProps
+          settingsOwner = owner
           return <div data-testid="settings-seat" data-wide={owner.wide} />
         }
         regionOwner = owner as SidebarSectionOwnerProps