fix: simplify hotel page copy without render loop

[hoangsvit]

Summary

• keep the cleaner, product-facing hotel copy
• fix the UI regression caused by the previous global MutationObserver
• stop observing the entire document / characterData
• scope result-card copy updates to direct list rerenders only
• update hotel detail copy only when the detail modal is opened
• guard all text assignments to avoid self-triggering mutation loops
• keep pending/stale data messages concise and user-facing

Root cause

The previous copy layer observed the entire document with characterData: true while also assigning text inside the observer callback. discoveryMeta.textContent was rewritten on every callback, which could continually retrigger MutationObserver and cause the hotel page to lag, freeze, or render incorrectly.

Fix

Copy cleanup is now idempotent and scoped. There is no global DOM observer.

[coderabbitai]

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[github-actions]

🌍 Web preview

• Open travel dashboard
• Open live flight prices
• Open live hotel prices

Preview is pinned to commit 499c962 and updates automatically when the PR changes.

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