Redesign desktop workspace panels

[cnjack]

Summary

• redesign the desktop workspace around a compact floating task status panel and a focused work panel
• show current Todo, plan history, and artifacts together without tabs or duplicated Todo details
• preserve artifact preview, download, fullscreen, system open/reveal, and cloud sharing through the preview dialog
• add independent terminal tabs with create and per-tab close behavior
• add responsive layout refinements, localized labels, and interactive HTML design prototypes

Why

The previous desktop layout consumed too much chat space, mixed current task state with historical plan snapshots, and made auxiliary tools feel like permanent sidebars. The new structure keeps status glanceable while moving detailed work into focused overlays.

Root cause addressed

Todo snapshots were appended to plan history on every status update and then rendered with their full Todo rows. This made one logical plan appear repeatedly and duplicated the current Todo list. Consecutive revisions of the same Todo identity set are now merged, and history renders a compact summary.

User impact

Users get a smaller, stable status float with predictable expand/collapse behavior, concise artifact entries with full functionality on demand, and usable multi-tab terminals without sacrificing chat space.

Validation

• pnpm --dir web test — 39 tests passed
• make lint-web
• pnpm --dir web build
• pre-push: go build ./...
• pre-push: go vet ./...
• pre-push: incremental golangci-lint
• pre-push: go test ./...

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