fix(terminal): enable copy shortcuts in all terminal sessions

[jschwxrz]

summary:

• ctrl + shift + c and ctrl + c (with selection) now also work in shell terminals, not just agent sessions
• previously gated behind isAgentSession

fixes #1075
fixes #914

[vercel]

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[greptile-apps]

Greptile Summary

Extended copy shortcuts (Ctrl+Shift+C and Ctrl+C with selection) to all terminal sessions, not just agent sessions.

• Removed the isAgentSession boolean that was derived from options.providerId
• Eliminated the conditional check that gated copy functionality behind agent sessions
• Copy and paste shortcuts now work consistently in both shell terminals and agent sessions

The change is minimal, safe, and improves UX consistency across terminal types.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The change is minimal (removes 3 lines), well-tested by existing unit tests, improves consistency, and has no side effects
• No files require special attention

Important Files Changed

Filename	Overview
src/renderer/terminal/TerminalSessionManager.ts	Removed isAgentSession gate to enable copy shortcuts in all terminal sessions

_{Last reviewed commit: 06afa19}

[arnestrickmann]

Sick, thanks!