feat(design): surface phase PR 1 — Lucide icon migration + scale enforcement

Replaces every hand-inlined SVG in the chrome (60 across 15 files)
with Lucide components. Snaps icon sizes to the doc's 16/24 scale —
all icons in this pass land at 16. AppLogo wordmark stays as the
legitimate "custom app icon" exception per the doc; GraphView's <svg>
mount point for D3 stays as well.

Replaces emoji-as-icons in clear button-affordance cases with their
Lucide equivalents: ✕ → X (close/dismiss buttons across 8 files), ✓ →
Check (ProjectView task-advance button), 🎤 → Mic (ChatPanel voice
CTA), 📎 → Paperclip (ChatView context toggle), &uarr; → ArrowUp
(ChatInputBar Send), &times; → X (ChatPanel context-note remove), ☀/☾
→ Sun/Moon (AppHeader theme toggle).

Inline emoji punctuation in textual confirmation copy ("Saved ✓",
"Created ✓", `done: "✓"` status maps, `'✓' : '📄'` interpolations)
is left for surface-phase voice/tone touchups — replacing requires
structural template changes and is best done per-component.

Stroke weight stays at Lucide's default 2px; tightening to the doc's
1.5/1 is deferred per the surface-phase spec (option ii: drop-in +
scale enforcement).

Adds lucide-vue-next ^0.469.0 to frontend/package.json. Docker
rebuild handles the install.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/views/CalendarView.vue

@@ -10,6 +10,7 @@ import { listEvents, updateEvent, type EventEntry } from "@/api/client";
 import EventSlideOver from "@/components/EventSlideOver.vue";
 import { useToastStore } from "@/stores/toast";
 import { fmtTime, fmtDateTime, fmtDayLabel } from "@/utils/dateFormat";
+import { MapPin } from "lucide-vue-next";
 
 const toast = useToastStore();
 const calendarRef = ref<InstanceType<typeof FullCalendar> | null>(null);
@@ -333,9 +334,7 @@ const upcomingGrouped = computed(() => {
                   </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>
+                  <MapPin :size="16" style="flex-shrink:0" />
                   {{ ev.location }}
                 </div>
                 <div v-if="ev.description" class="upcoming-card-desc">{{ ev.description }}</div>
@@ -367,9 +366,7 @@ const upcomingGrouped = computed(() => {
             </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>
+            <MapPin :size="16" style="flex-shrink:0;margin-top:1px" />
             {{ popover.location }}
           </div>
           <div v-if="popover.description" class="popover-desc">{{ popover.description }}</div>