- Replaced <Input> with auto-growing <textarea> that expands as you type
- Supports multiline input: Enter inserts newline, Ctrl+Enter sends
- Single-line mode preserved: if no newlines yet, Enter still sends
- Expand/collapse button (Maximize2/Minimize2) toggles between 4-line
max (collapsed) and 16-line max (expanded) views
- Markdown / Plain-text toggle: #MD (monospace font, markdown paste
preserves formatting) vs T TXT (sans-serif, plain text)
- Smart paste in markdown mode: intercepts clipboard to preserve raw
markdown text instead of browser's rich-text conversion
- Line counter badge (e.g. '15L MD') shown when multiline
- Ctrl hint label under send button for discoverability
- Placeholder updated: 'Введите команду или вопрос… (Ctrl+Enter отправить)'
- Textarea resets height after message is sent
- Removed unused Input import
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