Improve caret placement when entering in-place edit mode via keyboard shortcut

When an advanced user presses e (shortcut for Edit), XWiki should enter in-place edit mode in a way that keeps focus, selection, and caret position aligned with what the user was reading, not only preserving scroll position.
Today, entering edit mode leaves the caret outside the viewport, the the default focus target is often the title field (at the top of page content), which is especially challenging for keyboard-only users collaboration with large page content, who cannot easily click to reposition the caret after edit mode starts. In general, the focused field must be visible in the viewport, and the caret should be placed in a sensible, visible location inside the editable content the user was working with.