Optimize message rendering and timeline dedup

[jackjackbits]

Summary

• cache per-message content analysis (max token length + payment link extraction) and reuse in text rendering
• cache merged private chat message lists with invalidation on chat/peer updates
• add ID-set based dedup to public timelines to avoid O(n) scans

Testing

• xcodebuild -project bitchat.xcodeproj -scheme "bitchat (iOS)" -sdk iphonesimulator -destination 'platform=iOS Simulator,name=iPhone 17' test

Notes

• iPhone 15 simulator not available locally; used iPhone 17

[chatgpt-codex-connector]

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Reviewed commit: d444051542

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[chatgpt-codex-connector]

Invalidate private chat cache when delivery status changes

Because getPrivateChatMessages now returns a cached, already de‑duplicated array, later delivery/read receipt updates that mutate only one of the duplicate message copies (e.g., short vs long peer IDs) won’t recompute the “best by status” choice. In those cases the UI can keep showing the lower‑status copy even after a higher‑status update arrives, since the cache is reused and no merge logic runs again. This regression only shows up when the same message ID exists under multiple peer IDs and delivery status advances on the non‑cached copy.

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[jackjackbits]

Addressed Codex review: I now invalidate the private chat cache whenever delivery/read status changes (Noise receipts, GeoDM receipts, and general status updates). Pushed in 452ecf2.

[jackjackbits]

Follow-up: added commit 9286266 to expose cache invalidation helper for the new status hooks. Re-ran iOS tests but the run timed out at 120s and reported failures in BLEServiceTests/sendPublicMessage, sendPrivateMessage, and sendMessageWithMentions. Happy to re-run with a longer timeout.