🎨 Palette: Disable chat input while neuro-link is offline

[teerthsharma]

💡 What: Disabled the input field and send button in ChatInterface when the system's tunnelStatus is not 'LOCKED'.
🎯 Why: Previously, users could type and attempt to send messages while the neuro-link was disconnected or connecting. This led to failed dispatches and poor user feedback. Now, the interface explicitly explains why interactions are disabled (e.g., "Waiting for neuro-link...") using dynamic placeholders and tooltips.
📸 Before/After: The button and input now accurately reflect visual disabled states (opacity-50, cursor-not-allowed) when offline.
♿ Accessibility: Dynamically added explicit aria-label and title attributes on the send button depending on the system's connection status, providing screen readers and mouse users immediate contextual clarity on the disabled state.

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PR created automatically by Jules for task 43071599361518803 started by @teerthsharma

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