v0.8.63

Summary

• Pond IDE source control: create branch, checkout branch with dirty-worktree confirmation, themed PromptDialog and ConfirmDialog alert mode.
• Chat / Overlay: web_fetch tool icon and URL summary in tool-call cards.
• Git panel: stage-all / unstage-all / unstage errors use themed alerts (consistent with single-file stage).

Engine

Requires piscis-engine v0.8.58 (unchanged from v0.8.62).

Test plan

• Pond IDE → Source Control → New branch → create and refresh branch list
• With uncommitted changes, switch branch → dirty-worktree confirm → checkout succeeds
• Stage / unstage errors show themed alert (not native window.alert)
• Chat tool row shows 📰 and URL for web_fetch calls