[4/6] Restore v0.53 process cards / 迁移 0.53 风格过程卡片

[SivanCola]

Summary / 摘要

• Restore the v0.53-style process-card presentation for reasoning, tool calls, phases, notices, and compaction events.
• Introduce a shared ProcessCard/Toner-style abstraction with migrated icons and color treatments.
• Adapt the process cards to the newer chat layout and streaming states.

Validation / 验证

• npm run typecheck && npm run build
• go test . -run 'TestPreviewSessionMessages|TestHistoryMessages|TestToWireTool' (desktop)\n- go test ./internal/event ./internal/serve ./internal/agent ./internal/control\n- git diff --check

[chatgpt-codex-connector]

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