Contacts: full detail pane, search, selection UX, empty illustration; Calendar invite deep-link

Contacts plugin:
- Detail pane now renders ALL populated fields (job/company subtitle, every email,
  phones, addresses, websites, nickname, birthday, notes) — not just the email.
- Company fallback for the display name: personal name → company → email, applied at
  read time so existing contacts whose name_display holds only the email now show the
  company without a re-save; name_display no longer stores emails going forward.
- Search box in the list top bar (like Calendar): debounced, matches name/email/company,
  keeps focus + caret across re-renders.
- Mail-style selection: hovering a row's avatar reveals a square checkbox; once anything
  is checked every row shows one (select mode), the bar "select all" matches and aligns
  with the row checkboxes, and the detail pane shows "N contact(s) selected".
- Delete contact now confirms via a modal.
- Empty reading pane shows contacts-illustration.svg (served from the plugin's ui/ dir),
  mirroring Mail's email-illustration empty state.

Calendar:
- Invite from a contact opens /p/calendar?guest=<email>, which pops a new-event form with
  that guest already added, then strips the param.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01U72FZiF1W1pb8XxyWBTREA

plugins/webmail_plugin_contacts/pyproject.toml

@@ -17,4 +17,4 @@ contacts = "webmail_plugin_contacts:plugin"
 packages = ["webmail_plugin_contacts"]
 
 [tool.setuptools.package-data]
-webmail_plugin_contacts = ["ui/*.js", "migrations/versions/*.py"]
+webmail_plugin_contacts = ["ui/*.js", "ui/*.svg", "migrations/versions/*.py"]