feat(ext/popup): add pop-out to tab for forms

Forms can now be opened in a full browser tab via the ⤴ button,
solving Chrome's popup closure on file picker interaction. Deep
linking via URL params preserves view, item type, and item ID.

Also removes the unused dropdown picker code from item-list.ts.

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

extension/src/popup/components/item-list.ts

@@ -223,102 +223,6 @@ function handleListKeydown(e: KeyboardEvent): void {
 }
 
 // ----------------------------------------------------------------------
-// New-item type picker popover
-// ----------------------------------------------------------------------
-
-const NEW_TYPE_OPTIONS: Array<{ type: ItemType; icon: string; label: string; disabled?: boolean; tooltip?: string }> = [
-  { type: 'login',       icon: '🔑', label: 'login' },
-  { type: 'secure_note', icon: '📝', label: 'secure note' },
-  { type: 'identity',    icon: '🪪', label: 'identity' },
-  { type: 'card',        icon: '💳', label: 'card' },
-  { type: 'key',         icon: '🗝',  label: 'key' },
-  { type: 'totp',        icon: '⏱',  label: 'totp' },
-  { type: 'document',    icon: '📄', label: 'document' },
-];
-
-function showNewTypePicker(anchor: HTMLElement): void {
-  document.querySelectorAll('.new-type-picker').forEach((el) => el.remove());
-
-  const picker = document.createElement('div');
-  picker.className = 'new-type-picker';
-  Object.assign(picker.style, {
-    position: 'absolute',
-    background: '#161b22',
-    border: '1px solid #30363d',
-    borderRadius: '6px',
-    boxShadow: '0 4px 12px rgba(0,0,0,0.4)',
-    padding: '4px',
-    minWidth: '160px',
-    maxHeight: '280px',
-    overflowY: 'auto',
-    zIndex: '999999',
-    fontSize: '12px',
-  });
-
-  const rect = anchor.getBoundingClientRect();
-  const dropdownHeight = 220; // approx height for 7 items
-  const spaceBelow = window.innerHeight - rect.bottom;
-  if (spaceBelow < dropdownHeight && rect.top > dropdownHeight) {
-    picker.style.bottom = `${window.innerHeight - rect.top + 4}px`;
-  } else {
-    picker.style.top = `${rect.bottom + 4}px`;
-  }
-  picker.style.left = `${rect.left}px`;
-
-  for (const opt of NEW_TYPE_OPTIONS) {
-    const row = document.createElement('div');
-    Object.assign(row.style, {
-      padding: '6px 10px',
-      cursor: opt.disabled ? 'not-allowed' : 'pointer',
-      color: opt.disabled ? '#484f58' : '#c9d1d9',
-      borderRadius: '4px',
-      display: 'flex', alignItems: 'center', gap: '8px',
-    });
-    if (opt.tooltip) row.title = opt.tooltip;
-    const iconSpan = document.createElement('span');
-    Object.assign(iconSpan.style, { fontSize: '14px', width: '16px', display: 'inline-block', textAlign: 'center' });
-    iconSpan.textContent = opt.icon;
-    const labelSpan = document.createElement('span');
-    labelSpan.textContent = opt.label;
-    row.appendChild(iconSpan);
-    row.appendChild(labelSpan);
-    if (!opt.disabled) {
-      row.addEventListener('mouseenter', () => { row.style.background = '#21262d'; });
-      row.addEventListener('mouseleave', () => { row.style.background = 'transparent'; });
-      row.addEventListener('click', (ev) => {
-        ev.stopPropagation();
-        picker.remove();
-        document.removeEventListener('click', closeOnOutside);
-        document.removeEventListener('keydown', closeOnEsc);
-        setState({ newType: opt.type });
-        navigate('add');
-      });
-    }
-    picker.appendChild(row);
-  }
-
-  document.body.appendChild(picker);
-
-  const closeOnOutside = (ev: MouseEvent) => {
-    if (!picker.contains(ev.target as Node)) {
-      picker.remove();
-      document.removeEventListener('click', closeOnOutside);
-      document.removeEventListener('keydown', closeOnEsc);
-    }
-  };
-  const closeOnEsc = (ev: KeyboardEvent) => {
-    if (ev.key === 'Escape') {
-      picker.remove();
-      document.removeEventListener('click', closeOnOutside);
-      document.removeEventListener('keydown', closeOnEsc);
-    }
-  };
-  setTimeout(() => {
-    document.addEventListener('click', closeOnOutside);
-    document.addEventListener('keydown', closeOnEsc);
-  }, 0);
-}
-
 // ----------------------------------------------------------------------
 // Settings picker popover (device vs vault)
 // ----------------------------------------------------------------------