[CyberDex]

Closes #229

Adds multiline: true to Input, which turns it into a text area.

• The hidden field is a <textarea>, so typing, IME, paste and selection stay native.
• Enter inserts a line break; Escape or clicking away ends the session.
• Lines wrap to the width (after a space, or inside a word that does not fit). The text is clipped and scrolls vertically to keep the caret line visible: caret movement, mouse wheel, and drag-selection past the top or bottom.
• Pointer and touch clicks, drags and double/triple-click work across lines.
• Up/Down/Home/End (with Shift) are handled by the component, since the textarea does not know how it wrapped the lines. Up/Down keep the column.
• Selection draws one rectangle per line; secure masks everything except line breaks.
• align is ignored in multiline mode.

Single-line behaviour is unchanged.

Testing

• New tests/components/InputMultiline.test.ts; full jest, tsc and eslint pass.
• Not checked in a real browser: Storybook would not start locally (wsToken is required error). Please try the new multiline control on the Graphics Input story.

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