Jump over collapsed projects when reordering sessions

[edwin-zvs]

Problem

In the TUI session view, reordering a session over a collapsed project (C-x C-n / C-x C-p, or Shift+Up/Shift+Down) swapped the session with each hidden member of that project one keypress at a time. Because the project's members are hidden, the session appeared to get "stuck" inside the collapsed project for several keypresses before emerging on the other side.

Fix

The reorder logic lives in the daemon (move_session), not the TUI. At a region boundary a session would enter the adjacent group and then swap through its members.

A movable session is always in a visible region (ungrouped, or an expanded group) — you can't select a session hidden inside a collapsed group — so the only collapsed groups a moved session ever meets are the adjacent regions it would step into. The fix is therefore localized to the boundary step:

• Added group_collapsed plus region_above_skipping_collapsed / region_below_skipping_collapsed, which loop past collapsed groups and return the first visible region in the move direction.
• move_session now uses these at region boundaries.

Net effect: moving a session toward a collapsed project jumps the entire project in one step, landing at the top/bottom edge of the next visible region instead of interleaving with hidden members. If the only thing in the move direction is a collapsed group (e.g. it's the last group), the move is a no-op rather than burying the session inside it — to drop a session into a collapsed project, expand it first.

Test

Added move_session_jumps_over_collapsed_project covering the down-jump (ungrouped → past collapsed group → top of next expanded group, collapsed members untouched) and the symmetric up-jump back to the ungrouped region.

cargo test -p agentd --bin agentd move_session
test session::tests::move_session_jumps_over_collapsed_project ... ok
test session::tests::move_session_ignores_hidden_subagents_in_reorder_region ... ok

No protocol/client/TUI changes — the collapsed state is already authoritative on the daemon (TUI collapse toggle persists via set_project_collapsed → set_group_collapsed).

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