[doowta]

Why

• A hovered task row shows three small buttons that cover its title, and right-clicking a row does nothing.
• Some task actions live in the hover strip, others only in the "…" menu, so there is no one place to look.

What this PR adds

• One "…" menu per task, on hover and on right-click at the pointer: Rename, Pin / Unpin, Mark as unread / read, Open folder (this computer), then Settle / Archive / Reopen and a red Delete. Each item shows its letter shortcut.
• Pinned rows keep a one-click Unpin in the hover strip.
• A scroll that does not move the list no longer closes an open menu.

	Hover	Menu	Right-click	Motion
Before		Master's "…" menu: Rename, Pin, Settle / Reopen, Archive, Delete; no shortcuts.	Nothing happens.
After

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

Related: independent of #1278 (calmer rows) and #1236 (collapsed rail); all touch the sidebar rows, so whichever lands later gets a small rebase.

Remote: when connected to a paired computer the menu leaves out Open folder (this computer's file manager can't show it); other computers' rows stay navigation-only.

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

Commits

1. Agent: one menu for every task row action
2. Agent: move a pinned row's pin into its hover strip
3. Agent: keep a menu open through a zero-distance scroll

Design

• Every menu goes through popup.rs; right-click uses Placement::At with the captured pointer position, and button-anchored menus follow their row if it moves.
• Action descriptors and separators are cached when sidebar entries change; labels read live pin and unread state. The sidebar talks to the screen through the existing events.
• While a sidebar menu is open, all rows (including other computers' rows) suppress hover. Other computers' tasks get no action menu.
• The list's scroll handler closes menus only when the scroll position actually changed. A zero-distance wheel event from the trackpad used to close the menu right after it opened.
• The Active / Settled / Archived ladder, paging and activity indicators are unchanged.

Files (under apps/maple-agent/app): assets/icons/eye.svg, src/assets.rs, src/ui/chat/mod.rs, src/ui/chat/sidebar.rs, src/ui/chat/sidebar_computers.rs, src/ui/chat/tests.rs, src/ui/popup.rs. 7 files, +682 / −315 (tests +316 / −46, 5 net added tests).

Checks (component Nix shell, Xcode 26.5, on master e5870485)

• cargo fmt --all -- --check: passed.
• cargo clippy -p maple-agent-app --all-targets --locked -- -D warnings: passed.
• cargo test -p maple-agent-app --locked: 949 passed, 2 ignored.
• 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 against master (recordings above).

Full-size images

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