Show expected flip duration on Grand Exchange offer tooltips

[mikeblunts]

Summary

Surfaces Copilot's predicted flip duration as an Est. time line on the Grand Exchange offer-slot tooltip, right under the existing Profit line.

Copilot already returns an expectedDuration with each suggestion — it's shown in the side panel ("X profit in 15 min") but nowhere on the GE screen itself. This puts it where you're actually looking: on the offer you're hovering, so you can gauge how long a flip should take without opening the panel.

How it works

• expectedDuration only lives on the live Suggestion, so SuggestionManager now caches the most recent expected duration per item name as suggestions arrive (cleared on reset()).
• TooltipController looks it up by item name and appends Est. time: <formatted> using the existing UIUtilities.formatSuggestionDuration, bumping the tooltip height by one line.

No backend changes — the data is already on the client.

Notes / limitations

• Shown only for items suggested in the current session (the only time expectedDuration is available); otherwise the tooltip is unchanged.
• It's the expected total duration (consistent with the side panel), not a live countdown.
• Happy to gate it behind a config toggle if you'd prefer it opt-in.
• Two natural follow-ups if you're interested: the per-item cache could be persisted across sessions, and Est. time could be shown for any item (not just suggested ones) if expectedDuration were attached to the /prices response — happy to do either.

Testing

Built against client 1.12.28 and run locally — Est. time shows under Profit on the sell-offer tooltip for suggested items.

Two files, ~28 lines: model/SuggestionManager.java, controller/TooltipController.java.

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