Sidebar task actions: discoverable rename and quick actions

[Phoenix500526]

Following the discussion on #4363 and #4362, I would like to step back and agree on the sidebar interaction before making further changes.

I understand @Astro-Han's concern that a named Rename menu item and a double-click shortcut serve different purposes: one helps people discover the action, while the other makes it quicker. Removing the menu entry just because it duplicates an action is not enough of a reason.

Double-click to rename feels reasonable to me in Maka because a single click already opens the task, and there is no separate double-click-to-open-window action in this interaction. But this is not a hill I want to die on. I am not proposing it as a universal convention or insisting that rename should have only one entry point.

What I would like to explore is making frequently used actions easier to reach while keeping the full menu:

• Keep Rename in the task's right-click context menu.
• Consider showing Pin and Archive as direct icons on the right when the row is hovered or keyboard-focused, rather than using that space for the three-dot button.
• Keep the existing double-click rename shortcut if it remains useful, without making it the only way to find the action.

Pin is an action I use often; I do not have usage data showing that everyone uses it the same way. The goal is to reduce the extra step of opening a menu for common actions. Replacing the three-dot button also raises a discoverability question of its own, so we would need to agree on how users find and open the full menu, including with a keyboard. Keeping the three-dot button is also an option if that is clearer.

Would this be an improvement over the current sidebar, or is the current arrangement easier to understand? Which actions, if any, should be directly visible on the row?

I am happy to close #4363 if the community prefers the current behavior or a different design. There is no need to keep that PR alive just because the implementation is already written; I would rather agree on the interaction first and decide whether any follow-up change is worthwhile.