Audit fixes, nav redesign, zoom, loot enhancements, farming exp detec…

[ParkerM2]

…tion

• Fix theme violations: replace hardcoded green/red colors with primary/destructive
• Add dedup + 90-day retention pruning to saveUntrackedExpRecord
• Add first-install guard (ts > 0) in detectUntrackedFromBaseline
• Redesign Header: Card wrapper + 3-stage progressive collapse (full/compact/menu)
• Add zoom in/out feature (50-150%) persisted in Chrome storage
• Reduce side panel padding, fix background height at different zoom levels
• Add week grouping option to LootMap time filters
• LootGrid: add Badge totals per group header + grand total, border dividers
• LootTable: fix theme violation on net profit badge, use Badge component
• Remove duplicate CardFooter total from LootMap
• Add DropdownMenuSeparator and DropdownMenuLabel components
• Add farming exp detection: secondary trigger for "you gained X exp" messages
• Update agent docs with superpowers skills and documentation rules

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• High: This PR needs to be merged first, before other tasks.
• Medium: This PR should be merged quickly to prevent conflicts due to common changes. (default)
• Low: This PR does not affect other tasks, so it can be merged later.

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