feat: resizable side panels (folder rail + note list) - #15

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-node@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

'isCaretOnFirstLine' is already declared in the upper scope on line 14 column 5

'moveCursor' is already declared in the upper scope on line 13 column 5

'focus' is already declared in the upper scope on line 12 column 5

'setEditorMode' is already declared in the upper scope on line 11 column 5

Do not nest ternary expressions

Assignment to property of function parameter 'data'

The type 'subscribe' is undefined

The type 'forget' is undefined

The type 'dispose' is undefined