Hide exited sessions by default, and keep them out of the switcher

[karngyan]

Closes#70.

An exited session is history, not somewhere to go. Two changes, plus one the issue implies.

The sessions list folds them away

DEFAULT_VIEW.showExited flips to false. The fold is not a silent filter: a line under the list reads "N exited sessions · Show", counted after the search so the sentence matches the list it sits under (hiddenExited in sessions/view.ts). Show sets the same showExited the display options checkbox owns, so the reveal is a view edit like any other — the dirty flag lights, the choice persists, saved views keep working.

When everything on the fleet has ended, the screen no longer claims "No sessions yet"; the fold line stands in for the rows it hides.

The switcher stops offering them

At rest the palette is a "take me there" control, and a dead session is not a there:

• Exited sessions leave the resting arrangement entirely — Pinned, Recent, and All sessions.
• A pinned exited session loses its number badge, and the next pinned session takes it.
• A visited session the fleet reports as exited is skipped, not ghosted: its machine is answering, so unlike a ghost there is no sleeping laptop the row could wake.

A search brings them back, per the issue's suggestion: typing the name of a session you know ended and getting nothing would be its own kind of wrong. Matches rank after everything running and carry the word exited where a ghost says "unreachable".

The blind chords agree

cycleOrder (⌃⇧[ ] and the ⌃⇧1–9 pinned chords outside the palette) now skips exited sessions too. Not doing so would have ⌃⇧2 mean one session with the palette open and another with it shut, since the palette's badges no longer count the dead. Pressed from inside a session that has just ended, the cycle still leaves — stepCycle already starts from the top for a key it does not hold.

Deliberately untouched

• Ghost rows stay. An offline machine comes back; an exited shell does not.
• No daemon change.ExitedRetention and reaping are as they were; this is a client-side view decision.
• Wording is "exited" everywhere, matching the state heading, the group headcounts, and the existing checkbox.

Tests

pnpm vitest run: 68 files, 1372 tests, all passing. pnpm run lint clean. New coverage: the fold line and its count, the all-ended empty state, resting-palette exclusion, badge renumbering, exited-visit skipping, search re-inclusion and ranking, cycle behavior.

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