fix: prompt panel height and esc key forwarding

[MartianGreed]

Summary

• Fix prompt panel unbounded height growth by using textarea's actual configured height instead of recalculating from newline count
• Forward esc key to Claude sessions when in Urgent, Active, or Thinking state
• Improve multi-line paste handling timing in SendKeysToPane

Test plan

• Build passes: make build
• Tests pass: make test
• Manual test: paste 15+ lines in prompt mode, verify panel stays bounded
• Manual test: press esc when session is Urgent/Active/Thinking, verify it forwards to Claude

🤖 Generated with Claude Code

[greptile-apps]

Greptile Overview

Greptile Summary

This PR fixes two UI issues and improves paste handling reliability. The prompt panel height calculation now uses the textarea's configured height property instead of recalculating from newline count, preventing unbounded growth. The esc key is now forwarded to Claude sessions when they're in Urgent, Active, or Thinking states, allowing users to cancel operations. The multi-line paste timing has been improved with longer delays (50ms + 30ms vs 10ms) and the double-Enter threshold lowered from 3+ lines to 2+ lines.

Key Changes:

• Prompt panel height now bounded by textarea's configured max height (10 lines)
• Esc key forwarding implemented for interactive Claude states
• Paste detection improved with better timing and lower threshold

Confidence Score: 4/5

• This PR is safe to merge with low risk - changes are focused bug fixes
• The changes are well-contained fixes for specific UI issues. The prompt height fix correctly uses the textarea's configured height. The esc key forwarding logic is sound and properly checks session state. The paste timing changes increase delays which reduces risk. The only minor concern is the lowered double-Enter threshold (2+ vs 3+ lines) which could affect single-line inputs with newlines, but this appears intentional for improved paste detection.
• internal/tmux/client.go warrants testing with 2-line inputs to verify the lowered double-Enter threshold works as expected

Important Files Changed

Filename	Overview
internal/tui/view.go	Fixed prompt panel height calculation to use textarea's configured height instead of recalculating from content
internal/tui/model.go	Added esc key forwarding to Claude sessions when in Urgent, Active, or Thinking states
internal/tmux/client.go	Improved multi-line paste timing with increased delays and separated Enter commands

Sequence Diagram

sequenceDiagram
    participant User
    participant TUI as TUI Model
    participant Textarea
    participant Tmux as Tmux Client
    participant Claude as Claude Session
    
    Note over User,Claude: Esc Key Forwarding Flow
    User->>TUI: Press 'esc' key
    TUI->>TUI: Check if session selected
    TUI->>TUI: Check session state<br/>(Urgent/Active/Thinking)
    TUI->>Tmux: SendKeysToPaneRaw("Escape")
    Tmux->>Claude: Forward Escape key
    TUI->>TUI: addActivity("Sent Escape")
    
    Note over User,Claude: Prompt Panel Height Fix
    User->>TUI: Enter prompt mode
    TUI->>Textarea: SetHeight(calculated)
    TUI->>TUI: View() renders UI
    TUI->>Textarea: Height() - get configured height
    Note right of TUI: Uses textarea's actual<br/>configured height instead<br/>of recalculating from content
    TUI->>User: Display bounded panel
    
    Note over User,Claude: Multi-line Paste Flow
    User->>TUI: Submit multi-line prompt
    TUI->>Tmux: SendKeysToPane(session, pane, text)
    Tmux->>Claude: send-keys -l {text}
    Tmux->>Tmux: Sleep 50ms
    Tmux->>Claude: send-keys Enter
    alt 2+ lines (newline count >= 1)
        Tmux->>Tmux: Sleep 30ms
        Tmux->>Claude: send-keys Enter (2nd)
    end
    Tmux-->>TUI: Return success

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