feat(tui): add disable_mouse option for Linux right-click paste support

[aarongrtech]

Summary

Adds a --disable-mouse CLI flag and tui.disable_mouse config option to allow users to disable mouse tracking, enabling native terminal right-click paste functionality on Linux terminals that use PuTTY-style paste (e.g., Terminator).

Fixes #4754

Changes

• Added disable_mouse: boolean to TUI config schema (config.ts)
• Added --disable-mouse CLI flag to both thread.ts and attach.ts commands
• Implemented mouse tracking disable logic in app.tsx using ANSI escape sequences

Usage

CLI flag:

opencode --disable-mouse

Config file (opencode.json):

{
  "tui": {
    "disable_mouse": true
  }
}

Technical Details

When enabled, sends ANSI escape sequences to disable all mouse tracking modes:

• \x1b[?1000l - Disable button press/release tracking
• \x1b[?1002l - Disable button motion tracking
• \x1b[?1003l - Disable all motion tracking
• \x1b[?1006l - Disable SGR extended mouse mode

This allows the terminal's native right-click paste behavior to work instead of being intercepted by opentui.