fix(terminal): restore focus after context menu dismiss (follow-up to #2948)

[AllBeingsFuture]

Summary

Follow-up / re-host of #2948 with the review bug fixed.

Original head is AgentWrapper:ao/agent-orchestrator-37/terminal-context-menu; this account has pull-only on the upstream repo (403 on push). Fix is on AllBeingsFuture:fix/2948-context-menu-focus.

Fix

• Always refocus xterm when the context menu closes (Escape / outside click), not only after menu item actions — prevents silent typing loss after Radix steals focus.

Includes original #2948 feature + fix commit 5402ca73.

Test plan

• Right-click terminal → Escape → typing still reaches PTY without clicking
• Copy / Paste / Select All / Clear still work
• Frontend unit tests for context menu focus restore

[somewherelostt]

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This PR is being picked up by the current external contributor on-call pair:

• @illegalcall
• @Pulkit7070

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