(WIP) feat: initial ui extension framework

[urmauur]

Describe Your Changes

UIManager class that manages different UI components, allowing registration and retrieval based on component type. The components are categorized by a UIComponent enum

• RightPanelTabItem
• InputChatBox

Example use on extension

• Add new tab for right panel tab component

import { UIManager } from '@janhq/core'

 UIManager.instance().register(UIComponent.RightPanelTabItem, {
      name: 'Name',
      value: 'value',
      render: this.createRootRenderer(ReactComponentView),
    })

Fixes Issues

• Closes planning: Jan + Cortex Extensions UI Framework #2718
• Closes #

Self Checklist

• Added relevant comments, esp in complex areas
• Updated docs (for bug fixes / features)
• Created issues for follow-up changes or refactoring needed

[github-actions]

Barecheck - Code coverage report

Total: 69.32%

Your code coverage diff: -0.12% ▾

Uncovered files and lines

File	Lines
core/src/browser/views/UIManager.ts	32, 41-42, 45, 54, 62, 66-67, 69, 76
web/screens/Thread/ThreadRightPanel/index.tsx	86, 99, 103, 106, 111-115, 119-120, 126, 130, 133, 159-160, 175-176, 179-180, 182, 186, 190, 194, 200, 204, 242, 303-304