Earlier rounds shrank the SessionList by the dialog's row count to keep
the picker inside the viewport, but the SessionList could only claw back
whole session rows and bottomed out at zero entries. On a narrow
terminal with a long session title the dialog still wrapped past what
the SessionList could free, the picker overflowed the viewport, and the
TUI committed the header into native scrollback.
The picker now hosts the SessionList inside a single contentSlot
Container. Opening the delete confirmation swaps the dialog INTO that
slot (replacing the SessionList); closing it swaps the SessionList back.
The dialog therefore competes only with the SessionList's rendered
budget, not with the SessionList AND the picker chrome, so the picker
frame stays bounded by terminalRows even when the dialog wraps to many
rows. SessionList's external-reserve plumbing is no longer needed and is
removed.
Addresses PR #3285 second-round review feedback.
roboomp
e266782604