files: visual and ux bugs

[firstrose]

• OS: Win 11
• Version of IPFS Desktop [0.40]

I found something unreasonable in ipfs-desktop 0.40

1. The context-menu for a file item always pops at the bottom of the file row. So for an item at the bottom of screen, the menu breaks the layout.

2. Click every action in the context-menu will scroll the file list to the top. e.g, When I want to rename items at the bottom of file list, I have to scroll the list for every file.

3. When I select items in the list, there will be a flat popup at the bottom of the window. The popup masks items at the bottom of the list.

4. When selecting more than one files, the "Set pinning" button is disabled.

5. In the "Import from IPFS" dialog, textboxes don't have a right-click menu. So I can't paste sth only by mouse.

[george-hub331]

@lidel can i attempt this?

[SuchitraSwain]

@lidel I can do it