feat: add Code/Cowork session options and fix copy button position by GCWing · Pull Request #159

feat: add Code/Cowork session options and fix copy button position by GCWing · Pull Request #159 · GCWing/BitFun

- Add newCodeSession and newCoworkSession menu items in WorkspaceItem
- Support mode param in handleCreateSession for agentic/Cowork/Claw
- Remove forced color on split-right button in NavPanel
- Fix copy button position for multi-line code blocks (top: 0.35rem)
- Keep centered copy button for single-line code blocks via new CSS class
- Add i18n keys for newCodeSession and newCoworkSession (en-US, zh-CN)

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Co-Authored-By: BitFun