Fix repeated FlowChat code link jumps in editor

[wgqqqqq]

Summary

• add a per-navigation token so repeated clicks on the same FlowChat code link are treated as a new navigation request
• pass the navigation token through the file tab pipeline into the code editor
• keep Monaco jump deduplication only when the previous jump is still visibly applied in the active editor

Verification

• reproduced from webview.log that repeated ChatPane file view requests were reaching the UI layer
• ran pnpm --dir src/web-ui exec tsc --noEmit --pretty false

Behavior

Before this change, clicking the same FlowChat code link again after moving inside an already-open editor could be ignored.
After this change, the editor re-jumps even when the file stays open.