SVG mark (brand/bugtrail.svg): a bug at the head of the trail of steps
it walked, Tokyo Night palette. PNG icons 16/32/48/128 are rendered
from it (verify-logo.mjs) and shipped in the extension manifest;
web panel gets an SVG favicon; popup and options headers show the mark
instead of the generic bug glyph.

Co-Authored-By: Claude Code <noreply@anthropic.com>

Bug + trail: the recorded trail of actions leading to the bug.
User-facing rename in the web panel shell, extension manifest/popup/
options, API title, i18n locales and README; Firefox id is now
bugtrail@gnexus.space. Internal @ltt/* package scopes unchanged.

Co-Authored-By: Claude Code <noreply@anthropic.com>

- Toolbar click now opens a popup instead of jumping straight into the
  picker: two mode buttons (element note / record steps with live step
  count), the latest report of the default project with open and
  two-step delete, and an "Open web panel" shortcut to the project page.
- New background messages (start_picker, toggle_recorder, latest_report,
  delete_report, open_panel) resolve the active tab themselves; the
  action.onClicked path stays for keyboard-driven flows.
- Settings gain panelUrl (falls back to serverUrl); options page gets a
  "Web panel URL" input.
- After a note is submitted its share link is copied to the clipboard
  automatically (with an execCommand fallback) and a brief toast
  confirms it; e2e asserts the clipboard content.
- Build: new popup entry (own CSS chunk), manifest default_popup.

Co-Authored-By: Claude Code <noreply@anthropic.com>