Add BugTrail logo: extension icons, favicons and popup/options branding ...

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>

Rename the service to BugTrail ...

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>

Web panel: Vue 3 + gnexus-ui-kit, auth, projects, reports, i18n ...

- Monorepo packages: @ltt/shared (types+client), @ltt/ui (AnnotationEditor,
  ScreenshotViewer, ElementContext, EnvironmentInfo), @ltt/web (panel)
- Kit assets served at /assets in dev and build (absolute font URL workaround)
- Pages: login/register, projects, public project+report pages (token=auth),
  settings with en/ru switcher
- Annotation editor: pen/arrow/rect/text, Tokyo Night palette, undo,
  fraction coordinates, vector shapes persisted via attachment PATCH

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