[doowta]

Why

• Sidebar rows cut task titles to one line and don't show when a task last had activity or where its folder is.

What this PR adds

• Hovering a task shows a card beside it: the title (up to three lines), its age, the project name and the full folder path.
• The pointer can move onto the card; clicking the folder opens it in Finder (or the platform file manager) when the task runs on this computer.
• Row buttons, sidebar menus and renames take precedence and hide the card.

	Light	Dark	Card close-up	Motion (light)	Motion (dark)
Before			No card on master.
After

Scroll sideways to compare. Click an image for full size.

Related: includes the same task-row inset as #1278 (calmer rows), because the card lines up with the row highlight; whichever lands second drops the duplicate. Independent of #1236 (collapsed rail); both touch the sidebar, so the later one gets a small rebase.

Remote: when connected to a paired computer the card's folder line is plain text, with no local Finder; other computers' rows get no card until you switch to that computer.

Details for reviewers (commits, design, files, checks)

Commits

1. Agent: show a details card beside the hovered task row
2. Agent: anchor the hover card to the row highlight

Design

• popup::hover_panel uses Placement::Beside and the shared floating-element measurement and occlusion. It takes no focus, sits 6 px from the highlight, flips left when needed and stays inside the window's 8 px margin.
• The sidebar owns hover state and cancellable close and age tasks. A minute timer runs only while a card is shown and notifies only when the age label changes. Paths are cached when rows change; nothing is formatted in render.
• A 200 ms grace period lets the pointer cross onto the card. Wheel scrolling, keyboard reveal, a moved or removed row, sidebar collapse, menus, renames and window deactivation end the hover.
• On a selected remote computer the folder line is plain text; other computers' projected rows get no card. Other screens' menus don't hide the card (out of scope).
• Known limit: a path taller than the window is clipped at the window edge.

Files (under apps/maple-agent/app/src): ui/chat/sidebar.rs, ui/chat/mod.rs, ui/chat/navigation.rs, ui/chat/sidebar_paging.rs, ui/chat/tests.rs, ui/popup.rs. 6 files, +821 / −26 (tests +338 / −3, 8 net added tests).

Checks (component Nix shell, Xcode 26.5)

• cargo fmt --all -- --check: passed.
• cargo clippy -p maple-agent-app --all-targets --locked -- -D warnings: passed.
• cargo test -p maple-agent-app --locked: 952 passed, 2 ignored on master e5870485. The first run had one failure in the unrelated host::recovery_tests::quit_accepts_a_missing_owner_but_not_an_unreachable_live_owner, which passed on retry.
• Full workspace CI was not run locally; GitHub CI covers it. The local commit hook was skipped (MAPLE_HOOK_SKIP=1) because of the existing updater test installer::tests::reads_native_release_tar_format_and_preserves_bundle_modes, which fails only on this machine.
• Checked by hand in light and dark against master (recordings above).

Full-size images

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