feat: calendar event popover + upcoming events strip

B — Event popover: clicking a calendar event shows a compact overlay with
    full details (title, time range, location, description, color accent)
    and Edit/Close actions; positioned relative to the click, closes on
    outside click; Edit opens the existing EventSlideOver

C — Upcoming strip: scrollable section below the calendar showing the
    next 4 weeks of events grouped by day (Today/Tomorrow/date label),
    each card with color accent bar, title, time, location, description
    snippet; clicking a card opens EventSlideOver for edit

Both features stay in sync with create/update/delete operations.

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

frontend/src/views/CalendarView.vue

@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { ref } from "vue";
+import { ref, computed, onMounted, onUnmounted } from "vue";
 import FullCalendar from "@fullcalendar/vue3";
 import dayGridPlugin from "@fullcalendar/daygrid";
 import timeGridPlugin from "@fullcalendar/timegrid";
@@ -14,7 +14,7 @@ const toast = useToastStore();
 const calendarRef = ref<InstanceType<typeof FullCalendar> | null>(null);
 
 // Slide-over state
-const slideOverEvent = ref<EventEntry | null>(null);  // null = create mode
+const slideOverEvent = ref<EventEntry | null>(null);
 const slideOverOpen = ref(false);
 const slideOverDate = ref<string>("");
 
@@ -34,7 +34,7 @@ function closeSlideOver() {
   slideOverOpen.value = false;
 }
 
-// Event entry cache keyed by id for quick lookups when clicking FC events
+// Event entry cache keyed by id
 const eventCache = new Map<number, EventEntry>();
 
 function toFcEvent(e: EventEntry) {
@@ -50,6 +50,74 @@ function toFcEvent(e: EventEntry) {
   };
 }
 
+// ── Upcoming events list ───────────────────────────────────────────────────
+const upcomingEvents = ref<EventEntry[]>([]);
+
+async function loadUpcoming() {
+  const now = new Date();
+  const end = new Date(now.getTime() + 28 * 86_400_000); // 4 weeks
+  try {
+    const entries = await listEvents(now.toISOString(), end.toISOString());
+    upcomingEvents.value = entries.sort(
+      (a, b) => new Date(a.start_dt).getTime() - new Date(b.start_dt).getTime()
+    );
+  } catch { /* silent */ }
+}
+
+onMounted(loadUpcoming);
+
+// ── Event popover ──────────────────────────────────────────────────────────
+const popover = ref<EventEntry | null>(null);
+const popoverStyle = ref<Record<string, string>>({});
+const popoverEl = ref<HTMLElement | null>(null);
+
+function showPopover(entry: EventEntry, clickEvent: MouseEvent) {
+  popover.value = entry;
+  nextTickPositionPopover(clickEvent);
+}
+
+function nextTickPositionPopover(clickEvent: MouseEvent) {
+  // Position after DOM update
+  requestAnimationFrame(() => {
+    const vw = window.innerWidth;
+    const vh = window.innerHeight;
+    const pw = 280;
+    const ph = 220; // approximate
+    let left = clickEvent.clientX + 8;
+    let top = clickEvent.clientY + 8;
+    if (left + pw > vw - 16) left = clickEvent.clientX - pw - 8;
+    if (top + ph > vh - 16) top = clickEvent.clientY - ph - 8;
+    popoverStyle.value = {
+      position: "fixed",
+      left: `${Math.max(8, left)}px`,
+      top: `${Math.max(8, top)}px`,
+      zIndex: "9999",
+    };
+  });
+}
+
+function closePopover() {
+  popover.value = null;
+}
+
+function onPopoverEdit() {
+  if (popover.value) {
+    openEdit(popover.value);
+    closePopover();
+  }
+}
+
+// Close popover on outside click
+function onDocClick(e: MouseEvent) {
+  if (popover.value && popoverEl.value && !popoverEl.value.contains(e.target as Node)) {
+    closePopover();
+  }
+}
+
+onMounted(() => document.addEventListener("mousedown", onDocClick));
+onUnmounted(() => document.removeEventListener("mousedown", onDocClick));
+
+// ── Calendar callbacks ─────────────────────────────────────────────────────
 async function loadEvents(
   fetchInfo: { startStr: string; endStr: string },
   successCallback: (events: object[]) => void,
@@ -60,19 +128,21 @@ async function loadEvents(
     eventCache.clear();
     for (const e of entries) eventCache.set(e.id, e);
     successCallback(entries.map(toFcEvent));
+    loadUpcoming();
   } catch (err) {
     failureCallback(err instanceof Error ? err : new Error(String(err)));
   }
 }
 
 function handleDateClick(arg: DateClickArg) {
+  closePopover();
   openCreate(arg.dateStr);
 }
 
 function handleEventClick(arg: EventClickArg) {
   const id = arg.event.extendedProps.entryId as number;
   const entry = eventCache.get(id);
-  if (entry) openEdit(entry);
+  if (entry) showPopover(entry, arg.jsEvent as MouseEvent);
 }
 
 async function handleEventDrop(arg: EventDropArg) {
@@ -82,6 +152,7 @@ async function handleEventDrop(arg: EventDropArg) {
   try {
     const updated = await updateEvent(id, { start_dt, end_dt, all_day: arg.event.allDay });
     eventCache.set(id, updated);
+    loadUpcoming();
   } catch {
     arg.revert();
     toast.show("Failed to move event", "error");
@@ -95,6 +166,7 @@ async function handleEventResize(arg: EventResizeDoneArg) {
   try {
     const updated = await updateEvent(id, { start_dt, end_dt });
     eventCache.set(id, updated);
+    loadUpcoming();
   } catch {
     arg.revert();
     toast.show("Failed to resize event", "error");
@@ -105,11 +177,11 @@ function onCreated(entry: EventEntry) {
   eventCache.set(entry.id, entry);
   calendarRef.value?.getApi().addEvent(toFcEvent(entry));
   closeSlideOver();
+  loadUpcoming();
 }
 
 function onUpdated(entry: EventEntry) {
   eventCache.set(entry.id, entry);
-  // Replace the event in FullCalendar
   const api = calendarRef.value?.getApi();
   if (api) {
     const existing = api.getEventById(String(entry.id));
@@ -119,15 +191,15 @@ function onUpdated(entry: EventEntry) {
     }
   }
   closeSlideOver();
+  loadUpcoming();
 }
 
 function onDeleted(id: number) {
   eventCache.delete(id);
   const api = calendarRef.value?.getApi();
-  if (api) {
+  if (api) api.getEventById(String(id))?.remove();
-    api.getEventById(String(id))?.remove();
-  }
   closeSlideOver();
+  upcomingEvents.value = upcomingEvents.value.filter((e) => e.id !== id);
 }
 
 const calendarOptions: CalendarOptions = {
@@ -148,6 +220,41 @@ const calendarOptions: CalendarOptions = {
   eventResize: handleEventResize,
   height: "auto",
 };
+
+// ── Formatting helpers ─────────────────────────────────────────────────────
+function fmtDate(dt: string, allDay: boolean): string {
+  const d = new Date(dt);
+  if (allDay) return d.toLocaleDateString(undefined, { weekday: "short", month: "short", day: "numeric" });
+  return d.toLocaleString(undefined, { weekday: "short", month: "short", day: "numeric", hour: "numeric", minute: "2-digit" });
+}
+
+function fmtTime(dt: string): string {
+  return new Date(dt).toLocaleTimeString(undefined, { hour: "numeric", minute: "2-digit" });
+}
+
+function fmtDateShort(dt: string): string {
+  const d = new Date(dt);
+  const now = new Date();
+  const tomorrow = new Date(now); tomorrow.setDate(now.getDate() + 1);
+  if (d.toDateString() === now.toDateString()) return "Today";
+  if (d.toDateString() === tomorrow.toDateString()) return "Tomorrow";
+  return d.toLocaleDateString(undefined, { weekday: "short", month: "short", day: "numeric" });
+}
+
+// Group upcoming events by day label
+const upcomingGrouped = computed(() => {
+  const groups: { label: string; date: string; events: EventEntry[] }[] = [];
+  for (const e of upcomingEvents.value) {
+    const label = fmtDateShort(e.start_dt);
+    const existing = groups.find((g) => g.label === label);
+    if (existing) {
+      existing.events.push(e);
+    } else {
+      groups.push({ label, date: e.start_dt, events: [e] });
+    }
+  }
+  return groups;
+});
 </script>
 
 <template>
@@ -163,6 +270,79 @@ const calendarOptions: CalendarOptions = {
       <FullCalendar ref="calendarRef" :options="calendarOptions" />
     </div>
 
+    <!-- ── Upcoming events strip ───────────────────────────────────────── -->
+    <div v-if="upcomingEvents.length" class="upcoming-section">
+      <h2 class="upcoming-title">Upcoming</h2>
+      <div class="upcoming-groups">
+        <div v-for="group in upcomingGrouped" :key="group.label" class="upcoming-group">
+          <div class="upcoming-day-label">{{ group.label }}</div>
+          <div class="upcoming-cards">
+            <div
+              v-for="ev in group.events"
+              :key="ev.id"
+              class="upcoming-card"
+              :style="ev.color ? { '--ev-color': ev.color } : {}"
+              @click="openEdit(ev)"
+            >
+              <div class="upcoming-card-accent"></div>
+              <div class="upcoming-card-body">
+                <div class="upcoming-card-title">{{ ev.title }}</div>
+                <div class="upcoming-card-time">
+                  <template v-if="ev.all_day">All day</template>
+                  <template v-else>
+                    {{ fmtTime(ev.start_dt) }}
+                    <span v-if="ev.end_dt"> – {{ fmtTime(ev.end_dt) }}</span>
+                  </template>
+                </div>
+                <div v-if="ev.location" class="upcoming-card-meta">
+                  <svg width="11" height="11" viewBox="0 0 24 24" fill="currentColor" style="flex-shrink:0">
+                    <path d="M12 2C8.13 2 5 5.13 5 9c0 5.25 7 13 7 13s7-7.75 7-13c0-3.87-3.13-7-7-7zm0 9.5c-1.38 0-2.5-1.12-2.5-2.5s1.12-2.5 2.5-2.5 2.5 1.12 2.5 2.5-1.12 2.5-2.5 2.5z"/>
+                  </svg>
+                  {{ ev.location }}
+                </div>
+                <div v-if="ev.description" class="upcoming-card-desc">{{ ev.description }}</div>
+              </div>
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+
+    <!-- ── Event popover ───────────────────────────────────────────────── -->
+    <Teleport to="body">
+      <div
+        v-if="popover"
+        ref="popoverEl"
+        class="event-popover"
+        :style="popoverStyle"
+      >
+        <div class="popover-accent" :style="popover.color ? { background: popover.color } : {}"></div>
+        <div class="popover-content">
+          <div class="popover-title">{{ popover.title }}</div>
+          <div class="popover-time">
+            <template v-if="popover.all_day">
+              {{ fmtDate(popover.start_dt, true) }}
+            </template>
+            <template v-else>
+              {{ fmtDate(popover.start_dt, false) }}
+              <span v-if="popover.end_dt"> – {{ fmtTime(popover.end_dt) }}</span>
+            </template>
+          </div>
+          <div v-if="popover.location" class="popover-meta">
+            <svg width="12" height="12" viewBox="0 0 24 24" fill="currentColor" style="flex-shrink:0;margin-top:1px">
+              <path d="M12 2C8.13 2 5 5.13 5 9c0 5.25 7 13 7 13s7-7.75 7-13c0-3.87-3.13-7-7-7zm0 9.5c-1.38 0-2.5-1.12-2.5-2.5s1.12-2.5 2.5-2.5 2.5 1.12 2.5 2.5-1.12 2.5-2.5 2.5z"/>
+            </svg>
+            {{ popover.location }}
+          </div>
+          <div v-if="popover.description" class="popover-desc">{{ popover.description }}</div>
+          <div class="popover-actions">
+            <button class="popover-btn popover-btn--edit" @click="onPopoverEdit">Edit</button>
+            <button class="popover-btn popover-btn--close" @click="closePopover">Close</button>
+          </div>
+        </div>
+      </div>
+    </Teleport>
+
     <EventSlideOver
       v-if="slideOverOpen"
       :event="slideOverEvent"
@@ -267,4 +447,184 @@ const calendarOptions: CalendarOptions = {
 :deep(.fc-scrollgrid th) { border-color: var(--color-border, #2a2b30); }
 :deep(.fc-daygrid-day) { cursor: pointer; }
 :deep(.fc-daygrid-day:hover) { background: rgba(255,255,255,0.03); }
+
+/* ── Upcoming strip ─────────────────────────────────────────────────────── */
+.upcoming-section {
+  margin-top: 2rem;
+}
+
+.upcoming-title {
+  font-size: 1rem;
+  font-weight: 600;
+  color: var(--color-text-muted, #888);
+  text-transform: uppercase;
+  letter-spacing: 0.06em;
+  font-size: 0.78rem;
+  margin: 0 0 1rem;
+}
+
+.upcoming-groups {
+  display: flex;
+  flex-direction: column;
+  gap: 1.5rem;
+}
+
+.upcoming-day-label {
+  font-size: 0.8rem;
+  font-weight: 700;
+  color: var(--color-text-muted, #888);
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+  margin-bottom: 0.5rem;
+}
+
+.upcoming-cards {
+  display: flex;
+  flex-direction: column;
+  gap: 0.5rem;
+}
+
+.upcoming-card {
+  display: flex;
+  align-items: stretch;
+  gap: 0;
+  background: var(--color-surface, #1a1b1e);
+  border: 1px solid var(--color-border, #2a2b30);
+  border-radius: 10px;
+  overflow: hidden;
+  cursor: pointer;
+  transition: border-color 0.15s, background 0.15s;
+}
+.upcoming-card:hover {
+  border-color: rgba(99,102,241,0.4);
+  background: var(--color-bg-secondary, #16171a);
+}
+
+.upcoming-card-accent {
+  width: 4px;
+  flex-shrink: 0;
+  background: var(--ev-color, #6366f1);
+}
+
+.upcoming-card-body {
+  padding: 0.6rem 0.85rem;
+  flex: 1;
+  min-width: 0;
+}
+
+.upcoming-card-title {
+  font-size: 0.9rem;
+  font-weight: 600;
+  color: var(--color-text, #e8e9f0);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.upcoming-card-time {
+  font-size: 0.78rem;
+  color: var(--color-text-muted, #888);
+  margin-top: 0.15rem;
+}
+
+.upcoming-card-meta {
+  display: flex;
+  align-items: flex-start;
+  gap: 0.3rem;
+  font-size: 0.78rem;
+  color: var(--color-text-muted, #888);
+  margin-top: 0.25rem;
+}
+
+.upcoming-card-desc {
+  font-size: 0.8rem;
+  color: var(--color-text-secondary, #aaa);
+  margin-top: 0.3rem;
+  display: -webkit-box;
+  -webkit-line-clamp: 2;
+  -webkit-box-orient: vertical;
+  overflow: hidden;
+}
+
+/* ── Event popover ──────────────────────────────────────────────────────── */
+.event-popover {
+  background: var(--color-bg-card, #1e1f24);
+  border: 1px solid var(--color-border, #2a2b30);
+  border-radius: 12px;
+  box-shadow: 0 8px 32px rgba(0,0,0,0.45);
+  width: 280px;
+  overflow: hidden;
+  display: flex;
+  flex-direction: column;
+}
+
+.popover-accent {
+  height: 4px;
+  background: var(--color-primary, #6366f1);
+}
+
+.popover-content {
+  padding: 0.85rem 1rem 0.75rem;
+}
+
+.popover-title {
+  font-size: 0.95rem;
+  font-weight: 700;
+  color: var(--color-text, #e8e9f0);
+  margin-bottom: 0.35rem;
+}
+
+.popover-time {
+  font-size: 0.8rem;
+  color: var(--color-text-muted, #888);
+  margin-bottom: 0.4rem;
+}
+
+.popover-meta {
+  display: flex;
+  align-items: flex-start;
+  gap: 0.3rem;
+  font-size: 0.8rem;
+  color: var(--color-text-muted, #888);
+  margin-bottom: 0.4rem;
+}
+
+.popover-desc {
+  font-size: 0.82rem;
+  color: var(--color-text-secondary, #aaa);
+  line-height: 1.45;
+  margin-bottom: 0.6rem;
+  display: -webkit-box;
+  -webkit-line-clamp: 4;
+  -webkit-box-orient: vertical;
+  overflow: hidden;
+}
+
+.popover-actions {
+  display: flex;
+  gap: 0.5rem;
+  padding-top: 0.5rem;
+  border-top: 1px solid var(--color-border, #2a2b30);
+}
+
+.popover-btn {
+  flex: 1;
+  padding: 0.35rem 0;
+  border: none;
+  border-radius: 6px;
+  font-size: 0.82rem;
+  font-weight: 600;
+  cursor: pointer;
+  transition: opacity 0.15s;
+}
+.popover-btn:hover { opacity: 0.85; }
+.popover-btn--edit {
+  background: var(--color-primary, #6366f1);
+  color: #fff;
+}
+.popover-btn--close {
+  background: var(--color-input-bg, #111113);
+  color: var(--color-text-muted, #888);
+  border: 1px solid var(--color-border, #2a2b30);
+}
 </style>