feat(tui): add /session-id and /session-info slash commands

[EZotoff]

Summary

Adds two native TUI slash commands that copy session information to the system clipboard with a toast confirmation — no LLM round-trip.

Command	What it copies
/session-id	The current session ID (e.g. ses_abc123)
/session-info	Project <dir>; Session <title>; ID <session-id>

Both commands appear in the slash command palette under the Session category and are only enabled when a session is active (props.sessionID exists).

Supersedes #11938 (closed by automated PR cleanup after 1 month + <2 reactions — not a technical rejection). That PR covered only /session-id; this PR adds /session-info as a superset that also includes the project directory and session title.

Motivation

Session IDs are needed for handoff workflows, cross-session references, and manual session_read / session_search lookups. Currently there is no way to copy the session ID without mouse-selecting from the status bar or running session_list and scanning output.

/session-info is the broader version — copying project path + session title + ID in one operation is useful for pasting context into bug reports, PR descriptions, or team chat.

Implementation

• Uses the existing useClipboard() context (clipboard.write()) — cross-platform, no xclip dependency
• Uses the existing toast.show() for success feedback
• Only 42 lines added — two command palette entries in packages/tui/src/component/prompt/index.tsx
• Both commands are disabled (greyed out) when no session is active
• No plugin, no command.execute.before hook, no throw-based abort — pure TUI command palette entries

Related

• Supersedes feat: add /session-id command to copy session ID to clipboard #11938 (closed by automated cleanup)
• Original feature request: feat: add /session-id command to copy session ID to clipboard #11937 (auto-closed with the PR)
• feat(plugin): add cancellation support for command.execute.before hook #18559 — adds output.cancelled to command.execute.before for plugin-based cancellation (complementary; would allow plugins to cleanly abort without throwing)
• [FEATURE]: Return session info from CLI #15206 — CLI opencode session <id> info request (different scope)

Testing

• bunx tsc --noEmit passes (0 errors in modified file; pre-existing errors in dialog-move-session.tsx are unrelated)
• Pre-push CI hook: 25/25 packages typecheck successfully

Manual testing:

1. Open any session in TUI
2. Type /session-id — session ID is copied to clipboard + toast confirms
3. Type /session-info — project path, session title, and session ID are copied + toast confirms
4. Both commands are greyed out when no session is active

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

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