fix(web): restore pointer cursors for sidebar actions

[binbandit]

Summary

• restore pointer cursors for sidebar menu buttons, submenu buttons, and project header actions
• remove the thread row cursor override that forced a default cursor on clickable rows
• add a regression test covering default pointer cursors and the project drag-handle override

Why

Thread rows and project actions such as Show more were clickable but did not consistently present a pointer cursor on hover. The current code on main still had a cursor-default override on thread rows and no shared pointer cursor in the sidebar interactive primitives.

Validation

• bun fmt
• bun lint
• bun typecheck
• bun run test src/components/ui/sidebar.test.tsx

Note

Restore pointer cursors for sidebar menu buttons and thread rows

Adds cursor-pointer to sidebarMenuButtonVariants, SidebarMenuAction, and SidebarMenuSubButton in sidebar.tsx, and fixes resolveThreadRowClassName in Sidebar.logic.ts to use cursor-pointer instead of cursor-default. New tests in sidebar.test.tsx verify the default cursor and that it can be overridden with a custom class.

^{Macroscope summarized a8140f5.}

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[maria-rcks]

@binbandit could you rebase / fix conflicts?