fix: hide edit controls for non-owners in frontend

- Add useAuth and canEdit logic to RunEncounters.tsx
- Guard all mutation triggers (Log Shiny, Log Egg, End Run, Randomize All,
  HoF Edit, Boss Battle, route/team clicks, Advance to Next Leg)
- Update RunDashboard.tsx canEdit to be isOwner only (no unowned fallback)
- Add read-only banner for non-owner viewers in both pages

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.beans/nuzlocke-tracker-i2va--hide-edit-controls-for-non-owners-in-frontend.md

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+---
+# nuzlocke-tracker-i2va
+title: Hide edit controls for non-owners in frontend
+status: in-progress
+type: bug
+priority: critical
+created_at: 2026-03-21T12:18:38Z
+updated_at: 2026-03-21T12:32:45Z
+parent: nuzlocke-tracker-wwnu
+blocked_by:
+    - nuzlocke-tracker-73ba
+---
+
+## Problem
+
+`RunEncounters.tsx` has NO auth checks — all edit buttons (encounter modals, boss defeat, status changes, end run, shiny encounters, egg encounters, transfers, HoF team) are always visible, even to logged-out users viewing a public run.
+
+`RunDashboard.tsx` has `canEdit = isOwner || !run?.owner` (line 70) which means unowned legacy runs are editable by anyone, including logged-out users.
+
+## Approach
+
+1. Add `useAuth` and `canEdit` logic to `RunEncounters.tsx`, matching the pattern from `RunDashboard.tsx` but stricter: `canEdit = isOwner` (no fallback for unowned runs)
+2. Update `RunDashboard.tsx` line 70 to `canEdit = isOwner` (remove `|| !run?.owner`)
+3. Conditionally render all mutation UI elements based on `canEdit`:
+   - Encounter create/edit modals and triggers
+   - Boss defeat buttons
+   - Status change / End run buttons
+   - Shiny encounter / Egg encounter modals
+   - Transfer modal
+   - HoF team modal
+   - Visibility settings toggle
+4. Show a read-only banner when viewing someone else's run
+
+## Checklist
+
+- [x] Add `useAuth` import and `canEdit` logic to `RunEncounters.tsx`
+- [x] Guard all mutation triggers in `RunEncounters.tsx` behind `canEdit`
+- [x] Update `RunDashboard.tsx` `canEdit` to be `isOwner` only (no unowned fallback)
+- [x] Guard all mutation triggers in `RunDashboard.tsx` behind `canEdit`
+- [x] Add read-only indicator/banner for non-owner viewers
+- [x] Verify logged-out users see no edit controls on public runs