[Bug] - Input handler logic error prevents character input in AgentURL

[puwun]

Describe the bug
In the TUI's "New Evaluation" form, the AgentURL input field correctly accepts character input but fails to process the backspace key, we can add to the URL but cannot delete characters

in eval_form_controller.go, the condition change breaks backspace for field 0 (AgentURL):

 if m.evalState.currentField <= 1 && m.evalState.cursorPos > 0 

Additional context
This is likely a regression introduced by the logic changes for MCP support

• introduced in FIRE-812 | Rogue-TUI | MCP Support #115