fix: stabilize swap and stock display states

[zhaono1]

Summary

• keep compatible Swap quote content visible during re-quotes while deriving action loading from current request identity and quote readiness
• prevent disabled Preview and transient Refresh quotes states while the active quote round is still settling
• stabilize Stock cold-start ownership, token and network icon continuity, chart and recent-pair display cache, and status transitions
• reserve chart axis width and keep the live point stable during initial layout
• align Stock skeleton, receive-value, and action-button dimensions across loading and settled states

Execution safety

• cached or previous data is display-only and never marks the current request executable
• Swap and Stock actions remain fail-closed until the current request, event, and required readiness gates settle
• explicit terminal blockers such as insufficient balance, closed market, or no provider retain their own disabled labels

Scope

• main UI, Swap Jotai-derived state, and SWR display cache only
• no background transport, server API, database schema, or transaction execution changes

Validation

• 9 focused Jest suites — 124 tests passed
• yarn agent:check --profile commit — passed lint, format, context, staged lint, and staged TypeScript
• Desktop Electron single-runtime validation covered Swap initial and same-input refresh transitions plus Stock cold start, token switching, chart, recent pairs, and 50px action-button height across ordinary/loading/input states

Behavior note

Display continuity and execution readiness are deliberately separate. Compatible previous or cached data may stay visible to avoid flicker, while the action button communicates whether the current request is executable.

[chatgpt-codex-connector]

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