The top bar's back/search icons (24dp in a 32dp bar) and the bottom
bar's wrap toggle (a text label in a 24dp bar) were fiddly to hit.
Top bar: 32 -> 42dp (new TopBarHeight const, which buildFindBar and
the editor text area already hang off); its icons 24 -> 31dp (new
TopBarIconSize; the find bar keeps the smaller ui.IconSize). Bottom
bar: BottomBarHeight 24 -> 31dp, labels re-centred.
While verifying, a relaunch into an app-unreadable saved directory
(/storage/emulated is media_rw:media_rw 0750 on device; only
/storage/emulated/0 is app-exposed) showed an empty browser: os.Stat
passes for such dirs, so the restore guard now probes with a real
os.ReadDir — the same operation the browser index does.
Test expectations that hard-coded the old 32dp top bar now use
TopBarHeight. Verified on emulator and phone: back/search/wrap all
tappable, find bar still docks under the taller top bar.
Greg Pomerantz
ef54486683