tui: select a project/archived row before its click toggles it

[edwin-zvs]

What

Clicking a project header or an "N archived" disclosure row in the session list toggled collapse/expand on the very first click, even when that row wasn't selected. Reaching for a project with the mouse — to select it, act on it, or just see it highlighted — folded it as a side effect and shifted every row below out from under the cursor, so the next click landed somewhere the user never aimed at.

Both rows now take two clicks:

Click	Behavior
Row not selected	Select it. Nothing collapses/expands/reveals.
Row already selected	Toggle it (collapse project / reveal archive).

Unchanged:

• Ordinary session and service rows — still select-only.
• Column-specific disclosure markers (a session's nested-children marker, a service's children marker) — still toggle on the first click, since aiming at a single column is already an unambiguous intent.
• Keyboard collapse/expand, which operates on the selection and so is already "selected first".

Notes

• Spec specs/0178-list-row-click-selects-before-toggling.md records the rule so future full-row toggles follow it.
• Two new unit tests in crates/cli/src/app.rs cover the select-then-toggle sequence for the project header and the archived row.
• No recording: the change is mouse-interaction-only with no static visual difference, and vhs tapes can't emit mouse clicks.

Testing

• cargo test --workspace — all green. One unrelated flake on the first run (pty_render::tests::smith_tool_expand_collapse_rebuilds_only_retained_suffix, a wall-clock perf assertion that tripped while a concurrent cargo build loaded the machine); passes on its own.

Binary

Only touches crates/cli → relevant binary is construct:
/Users/moon/agentd/.claude/worktrees/list-group-click-select-first/target/debug/construct