feat(ai-chat): persist local conversations and add history UI

[adityathebe]

• persist active AI conversation across refresh/navigation
• add local conversation history with resume + delete
• make AI chat popover default size viewport-based (50% width, 70% height)

resolves: #2881

[vercel]

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Project	Deployment	Actions	Updated (UTC)
aws-preview	Ready	Preview	Feb 27, 2026 2:49pm
flanksource-ui	Ready	Preview	Feb 27, 2026 2:49pm

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