fix: dismiss best-effort toast so it stops covering header

[jvsena42]

Description

waitForToastBestEffort returns as soon as the toast is seen. Unlike waitForToast (which
drag-dismisses by default on Android), it left the toast on screen, and a Bitkit toast overlays the
header for its full ~8s lifetime — including HeaderMenu.

So every caller that follows a toast with openSettings() taps into the toast instead of the drawer
button, and DrawerSettings times out after 30s.

This was failing the settings shard deterministically (3/3 attempts) on 8 open bitkit-android PRs:
@settings_01 - Can switch local currency and @settings_06 - Can swipe to hide balance, both of
which touch TotalBalance (raising a toast) and then open Settings.

Frames from the failure video on bitkit-android#1291, one second apart — the "Switched to USD" toast
covers the hamburger exactly while the tap happens, and the hamburger only reappears after it fades:

t+2s — toast up, no hamburger	t+9s — toast gone, hamburger back
the HeaderMenu tap lands here	too late, DrawerSettings already timed out

Changes

• waitForToastBestEffort now clears the toast before returning, instead of only observing it.
• Android drag-dismisses it, mirroring what waitForToast already does.
• iOS keeps the existing wait-to-disappear path (drag-dismiss hits the wrong coordinates there,
  since iOS toasts render in a separate window) — no iOS behaviour change.
• The Android branch re-checks isDisplayed() before dragging: dragOnElement waits on the element
  with the global 30s CI timeout, which would otherwise be spent in full on a toast that already
  faded.
• Return value is unchanged: true if the toast was observed, false otherwise, never throws.

QA Notes

• tsc --noEmit and eslint test/helpers/actions.ts pass.
• prettier --check test/helpers/actions.ts fails on main unmodified too, so it is pre-existing and
  untouched here.
• Verified against the failing runs rather than re-derived: only the two settings tests that raise a
  toast before opening the drawer fail, and every other shard in the same run passes.

🤖 Generated with Claude Code

[jvsena42]

Superseded: this exact commit (9a5dab0) landed in main via #236, the companion for bitkit-android#1291, which merged alongside it. Closing rather than merging an empty diff — the fix and its rationale are in the commit.