* fix(skills): hide split icon and stop update-terminal respawn on refocus
The "Update skills" modal embeds a one-off command terminal via
OnboardingInlineCommandTerminal. Two issues:
1. The pane header showed the regular terminal's split ("Split Terminal
Right") icon, which makes no sense for an ephemeral single-command
terminal. Add an `allowSplit` prop (default true) threaded
TerminalPane -> TerminalPaneHeaderOverlay, and have all onboarding
inline command terminals pass `allowSplit={false}` to omit it.
2. Alt-tabbing out of Orca and back respawned the terminal. On window
focus, useSkillFreshness republishes {inventory: null, loading: true}
to retract stale update authority; the dialog reacts by nulling the
draft command, then re-sets it after the scan, and the
`key={terminalCommand}` remount spawns a fresh PTY. Add a ref-counted
suspendSkillFreshnessFocusRescan(); the dialog holds focus rescans
while a live terminal is showing so refocus no longer tears it down.
Explicit Re-check and install-changed refreshes still run.
* fix(skills): preserve freshness checks without respawning terminal
* fix(skills): keep revalidated terminal safe and focused
3a74721f89
