v0.3.1 — Interaction gaps, viewport tools, screenshot file-path, dialogOpened fix

Bundles everything since v0.2.0: the interaction-gaps batch, viewport tools, the
screenshot file-path fix, the to_be_deleted rename, and a real production bug fix
(click's dialogOpened false-positives on backgrounded tabs).

Added

• press_key / hover / drag_and_drop / upload_file — round out interactive-element
  coverage beyond click/type
• scroll_to — scroll an element or the page into view
• screenshot fullPage: true — capture the entire scrollable page in one shot instead
  of just the current viewport
• wait_for — poll a page to a target state (selector appears, text disappears, network
  idle) instead of guessing a fixed delay
• click/type/scroll_to/hover/upload_file/drag_and_drop/press_key now fall back
  to searching other frames when frameId is omitted
• list_elements includes table rows/headers as candidates, plus a per-element state
  object (checked/disabled/readonly/etc.) and domEpoch for detecting stale selectors
  across page changes

Changed

• screenshot now writes the PNG to a local file and returns its absolute path, instead
  of returning inline base64 — the inline-base64 response routinely blew past the calling
  model's context/token budget on real pages. Read the file directly instead of expecting
  image bytes in the tool response.
• move_to_pending_deletion renamed to to_be_deleted (same behavior — reversible move
  into a fixed "Pending Deletion" folder, never a real delete)
• acquire_tab waits for navigation to commit before returning url, instead of racing
  browser.tabs.create() and sometimes reporting about:blank

Fixed

• click's dialogOpened/domChanged fields were misreported on backgrounded tabs.
  Firefox throttles setTimeout/setInterval in a non-visible tab to a ~1000ms minimum
  interval, which made the click handler's dialog-detection heuristic time out and report a
  false dialogOpened: true even when the click succeeded normally. This was dangerous in
  practice: an agent reading dialogOpened: true could conclude the click didn't register
  and retry an already-successful destructive action (e.g. re-submitting a delete/apply on
  an admin panel). The fix detects tab visibility (tab.active AND the tab's window is
  OS-focused) and uses a longer timeout on backgrounded tabs instead of misreporting.

Install

Grab the .xpi below, drag into a Firefox window (or about:addons → gear icon → "Install
Add-on From File..."). Same add-on ID as prior releases, so this upgrades an existing install
in place — no need to remove the old one first.