Embedded terminal (v1)

[nitin-1926]

Summary

Run a profile inside an in-app terminal instead of shelling out to a new macOS Terminal window. v1 = a single embedded terminal launching ccpm run <profile>.

Approach

• Frontend: xterm.js + fit/webgl addons.
• Backend: real PTY via creack/pty, stream bytes over Wails events; handle resize, exit code, cleanup-on-close.
• Reuse the GUI-no-PATH resolution already in services/binary.go.

Acceptance criteria

• Embedded terminal launches ccpm run <profile>.
• Correct resize (fit addon <-> PTY winsize).
• Clean exit + process teardown on tab/app close (no orphan PTYs).
• Scrollback + copy/paste work.

Non-goals (v1)

Tabs / multiple instances (follow-up), split panes.