Main button: open cached AI draft if one exists, otherwise generate
a fast draft inline. No more intermediate Fast/Full/Note menu.
Caret on the side opens a focused popover with just a textarea +
Generate button — the user types instructions (e.g. 'thank them and
confirm Tuesday at 2', 'decline politely') and submitting fires the
full-mode generation with those instructions as the noteHint.
- _aiReplySplitButtonHtml(data) centralizes the new HTML so all three
reader render sites use the same markup.
- _showAiReplyChoice rewritten — drops the Fast/Full toggle row plus
the kebab + 'Draft with note' two-step. Ctrl/Cmd+Enter submits.
- _handleAiReplyButton routes based on which inner button was clicked
(caret → popover, main → run-or-open).
- The three reader event registrations now listen on .ai-reply-split
so both inner buttons feed the same handler.
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