Fayrouz Improvements

PaidBy field in expense logging is case-sensitive and causes broken balances when multiple users log expenses with different name formats (e.g. "giulia", "Giulia", "giuliatomas" all treated as separate payers). Fix needed: - Normalize PaidBy to lowercase or canonical username on write - OR match case-insensitively when reading/calculating balances - Map common aliases to canonical account (e.g. giulia, Giulia, giuliatomas → @giuliatomas) Context: Discovered during Uzbekistan trip when Youssef and Giulia were both logging expenses independently. --- Calendar fixes needed: - Calendar events still have issues that need resolving (editing, display, sync) - Need ability to edit and delete existing entries/transactions (pantry entries or any logged item) - Currently no way to correct wrong entries after the fact — must be able to change or delete any logged record --- Group expense experience needs to be more robust and smart: - Fayrouz on Giulia's side was hallucinating — not actually logging expenses, not calculating fields correctly, only throwing back numbers without writing anything - Root cause: anti-hallucination rules and verified-state enforcement must apply equally to ALL users in a group, not just the admin - Fix needed: - Every group expense write MUST return verified_state before confirming to user - Never say "logged" or "saved" unless the tool returned success - Auto-calculate splits correctly on write, not just display - Group members must have same trust level as admin for expense logging accuracy - Never break the trust — shared money is serious --- Report & Trip modularity: - Reports (trip report + settlement) are not modular — user cannot choose which sections to include or exclude - Settlement should be standalone OR embedded in trip report — user's choice - Trip record needs to be editable/updatable at any time (not just at creation) - Must be able to add notes directly to a trip from within the trip view - Proposed fix: - Report generation should offer a module picker: hero, itinerary, budget, settlement, fun facts, notes, map — each toggleable - Settlement as its own standalone page/report separate from the full trip report - Trip update UI: inline note adding, field editing post-creation - Never regenerate the whole report just to add a note