Fix export failures reported by users (1.1.4)

Export path

• Stop switching tabs during export. Activating the WhatsApp tab
  closed the popup, which killed the run with no error shown.
• Move export to a port connection so the popup can show live
  progress and the scroll loop stops if the popup closes.
• Add a preflight check in the popup that reports which
  precondition failed instead of a generic error.
• Inject content.js on demand when a tab has no content script,
  replacing the "reload the page" instruction. Adds the scripting
  permission, scoped to web.whatsapp.com.
• Guard against double injection registering listeners twice.

Selectors

• Use data-testid attributes as primary selectors, falling back to
  the previous English text matching. Fixes "could not open group
  info" on non-English WhatsApp UI.
• Raise drawer wait from 5s to 8s.
• Normalise bidi marks and Arabic-Indic digits before parsing.

Correctness

• Never click an unidentified button when looking for "View all".
  In a group with no such control the old matcher hit "Add members"
  and exported the user's entire address book as the group.
• Scrape the drawer directly for groups small enough to have no
  "View all" control. These previously failed with "no members found".
• Read the phone number from multi-line secondary cells. Unsaved
  members who had set a status lost their number entirely.
• Scope every lookup to the participants section. In a 1:1 chat the
  search reached the left chat list and scrolled it for ten seconds
  before failing.
• Only send Escape while a panel is open. The unconditional second
  press closed the user's chat after exporting a small group.
• Close the drawer on the failure path too.

Other

• Capitalise WhatsApp in the extension name.

Changed feedback form link