Typing a filter keyword now surfaces the matching filter row in the
autocomplete (each with its existing dropdown icon). Picking one pins
a filter pill and drives the global filter state.
Keyword catalog (_LIB_FILTER_OPTIONS):
- has-attachments ← 'attachment', 'attachments', 'has attachment', 'attach'
- unread ← 'unread', 'new', 'unseen'
- favorites ← 'favorite', 'starred', 'star', 'flagged'
- undone ← 'undone', 'pending', 'todo'
- reminders ← 'reminder', 'reminders'
- unanswered ← 'unanswered', 'unreplied', 'no reply'
- pending_30d ← 'pending 30d', 'pending', 'recent pending'
- stale_30d ← 'stale', 'old', 'stale 30d'
- tag:urgent ← 'urgent', 'critical'
- tag:reply-soon ← 'reply soon', 'reply', 'follow up'
- tag:spam ← 'spam', 'junk'
- tag:newsletter ← 'newsletter', 'newsletters', 'subscriptions'
- tag:marketing ← 'marketing', 'promo', 'promotional'
Filter pill behaviour:
- Only one filter pill is active at a time — adding a new one replaces
any existing filter pill.
- _applyFilterPillSideEffect drives the existing #email-lib-filter
select (or the #email-attach-btn toggle for has-attachments). The
server-side list refetch follows for free via the existing 'change'
handler.
- Removing the filter pill clears the side effect.
Pill render gains the filter icon as a leading glyph; the suggestion
row renders icon + label in the accent colour so it visually reads as
a filter, not a contact.
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