refactor(scribe): remove calendar + entity surfaces from web UI (frontend)

Frontend half of the narrowing (milestone #194); matches backend b49efdc.

- delete CalendarView, EventSlideOver, WeatherCard (orphan)
- drop /calendar route + nav link + the g→l keyboard shortcut
- strip the calendar-events API client + event/metadata bits from note
  types and the notes store
- KnowledgeView: remove People/Places/Lists tabs, entity cards, create
  buttons and the upcoming-events widget; keep notes/tasks/plans/processes
  + the overdue-task badge
- NoteEditorView: remove person/place/list forms + list-builder + entity
  metadata; keep note + process editors (type select = Note/Process)
- DashboardView: drop the "Upcoming · 7 days" events rail card
- SettingsView: remove the CalDAV integration card + save/test (its
  endpoints were deleted backend-side)
- prune the now-dead entity/event CSS

RecurrenceEditor + task recurrence rules are kept (task machinery, not
calendar). Verified by a full dangler sweep.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BPtbSzA4JLMAKgFZ8VTg7Q

frontend/src/stores/notes.ts

@@ -31,7 +31,6 @@ export const useNotesStore = defineStore("notes", () => {
     project_id?: number | null;
     milestone_id?: number | null;
     note_type?: string;
-    metadata?: Record<string, string> | null;
   }): Promise<Note> {
     try {
       return await apiPost<Note>("/api/notes", data);
@@ -43,7 +42,7 @@ export const useNotesStore = defineStore("notes", () => {
 
   async function updateNote(
     id: number,
-    data: Partial<Pick<Note, "title" | "body" | "tags" | "project_id" | "milestone_id" | "note_type" | "metadata">>
+    data: Partial<Pick<Note, "title" | "body" | "tags" | "project_id" | "milestone_id" | "note_type">>
   ): Promise<Note> {
     try {
       const note = await apiPut<Note>(`/api/notes/${id}`, data);