fix(activities): tighter populate race + log silent feed-fetch fail

CreateEventDialog.populateFromEvent released the watcher guard via
setTimeout(0). Switch to nextTick so the release waits for Vue's
microtask flush — setTimeout(0) only schedules a macrotask, which
can run before vee-validate's batched setValues lands, briefly
unguarding the auto-mirror during populate.

useEvents.fetchAll silently swallowed fetchMyEvents failures so a
flaky probe degraded to "public events only" with no signal in the
console. Add a console.warn so the degradation is debuggable without
toast-spamming users on transient errors.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/modules/activities/composables/useEvents.ts

@@ -29,9 +29,12 @@ export function useEvents() {
       const seen = new Set(publicEvents.map((e) => e.id))
       const own = myEvents.filter((e) => !seen.has(e.id))
       return [...publicEvents, ...own]
-    } catch {
+    } catch (err) {
       // Falling back to just the public feed is acceptable — the user
       // can still browse, they just won't see their own pending events.
+      // Log so a flaky probe is debuggable from the console without
+      // toast-spamming the user on every transient failure.
+      console.warn('[useEvents] fetchMyEvents failed, showing public feed only:', err)
       return publicEvents
     }
   }