The back/forward arrows in the topbar were styled as live buttons
(cursor_pointer, hover swap) but they had no on_click — they were
clickable affordances that did nothing. Per the "no fake handlers"
rule that's worse than no button at all: it lies to the user.
Pull the cursor and hover off, drop the text color to INK_5 so they
read as the design's `disabled` state (`var(--ely-ink-5)`), and
leave them untouched until real per-tab history lands in
BrowserCore. When the navigation API arrives the call site can
swap to a live variant.
ZacharyZhang-NY
432879b27f