fix: enable text wrapping in chat input field

[Priyanshu-byte-coder]

Summary

Closes #175

Chat input forced horizontal scrolling on long messages. Fixed by making the field grow vertically (1–5 lines) like Gemini/ChatGPT.

Changes

lib/screens/chat/chat_screen.dart

• Added minLines: 1 — starts as single line
• Added maxLines: 5 — expands up to 5 lines, then scrolls vertically
• Added keyboardType: TextInputType.multiline — enables soft-keyboard newline
• Added textInputAction: TextInputAction.newline — Enter key inserts newline; send uses the send button
• Removed onSubmitted (Enter no longer auto-sends; use the send button)

Before / After

	Before	After
Long message	Text scrolls horizontally off-screen	Text wraps to next line, stays visible
Send action	Enter key submits	Send button submits (Enter = newline)

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• lib/screens/chat/chat_screen.dart

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