feat: Auto-focus on click (browser-like behavior)

[eitanalka]

Fixes Issue #576

Problem

Currently, clicking on a focusable element (input, scrollbox, etc.) doesn't automatically focus it. Users must manually handle onMouseDown to set focus state, which is different from browser behavior.

Proposed Solution

Add browser-like auto-focus behavior to the renderer:

• Left-click triggers focus() on the clicked element
• If the element isn't focusable, bubble up to find the closest focusable ancestor
• Uses the same parent traversal pattern as isWithinContainer

Benefits

• Matches expected browser behavior
• Simplifies component code (no manual onMouseDown handlers needed)
• Works seamlessly with focusedBorderColor/focusedBackgroundColor style props

[pkg-pr-new]

@opentui/core

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@opentui/react

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@opentui/core-darwin-arm64

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@opentui/core-darwin-x64

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@opentui/core-linux-arm64

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@opentui/core-linux-x64

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@opentui/core-win32-arm64

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@opentui/core-win32-x64

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commit: bd3b8dc

[kommander]

I added test coverage for the mouse data handler on main. Can you merge that in or let me push to your branch?

[eitanalka]

I added test coverage for the mouse data handler on main. Can you merge that in or let me push to your branch?

I updated the branch and gave permission to push to the branch just in case you need to modify it still.