[FEATURE] Make /context display persist until ESC is pressed

Feature Description

The /context command currently auto-dismisses after displaying. It would be helpful if it persisted until the user presses ESC to dismiss it manually.

Use Case

When monitoring context usage during longer conversations, having /context stay visible allows users to reference the token breakdown while continuing to work, rather than having to re-run the command repeatedly.

Proposed Behavior

• /context displays and remains visible
• User presses ESC to dismiss
• Consistent with other modal/overlay dismissal patterns in Claude Code

Current Behavior

/context displays briefly then auto-dismisses without user input.

Environment

• Version: 2.1.12
• Platform: macOS