feat: add draggable sidebar resize functionality

[agustif]

Summary

• Add draggable resize handle for the TUI sidebar
• Sidebar width is now adjustable and persists in key-value storage
• Visual feedback with hover and drag states
• Proper clamping between min/max width limits

Changes

• Modified session layout to include resize handle
• Added mouse event handlers for drag functionality
• Updated sidebar component to accept dynamic width prop
• Added width persistence to KV storage

Screenshot

this is with hw = 3 (px)

this with hw = 1 (px) (current PR status)

[agustif]

should it be an option to have this enabled or not from config/settings/command like show/hide sidebar or just be on for everyone? idk

should it be just 1px regular bar instead of 3 to differentiate from non draggable?

[rekram1-node]

This is cool! I sent to rest of the team to ask for their opinions

[shuv1337]

love it. merged into shuvcode!

[github-actions[bot]]

Closing this pull request because it has had no updates for more than 60 days. If you plan to continue working on it, feel free to reopen or open a new PR.