The split-pane reload glyph had `cursor_pointer` + an `on_click` that
called `select_tab` — clicking the reload button just re-selected the
already-active tab. That's a fake handler.
Make the glyph visibly disabled (INK_5, no cursor, no click) until a
real per-tab reload action lands in BrowserCore. `refresh_tab` exists
but is `pub(super)` and only flips the discard state; surfacing it as
"reload" would mislead.
ZacharyZhang-NY
2ceb00a95a