[Feature Request] Configurable prompt input position (top or bottom)

Bug Description
Feature request: configurable prompt input position (top or bottom)

Currently the input prompt is fixed at the bottom of the TUI. Please add a setting to position it at the top instead.

Why:

• Long-running sessions push the input far from the most recent assistant output; with the prompt at the top, the latest reply stays adjacent to where I'm typing my next message.
• Matches the reading flow of some terminal multiplexer / tmux setups where status bars and active panes sit at the top.
• Accessibility: easier eye-tracking for users who prefer fixed-position input near the top of their visual field.
• Consistency with editor-style chat UIs where input can be repositioned.

Proposed shape:

• New setting in ~/.claude/settings.json, e.g. "inputPosition": "top" | "bottom" (default "bottom").
• Optional /config toggle.
• Optional keybinding to flip at runtime.

Acceptance:

• Setting persists across sessions.
• Scrollback, status line, and notifications render correctly in both orientations.
• No regression in paste handling, multi-line input, or slash-command autocomplete.

Environment Info

• Platform: linux
• Terminal: xterm-256color
• Version: 2.1.152
• Feedback ID: 974e8c41-2b11-4520-87c4-0ef7f3b9c7e6

Errors

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