refactor(notes): add shared types and component interfaces folders

src/interfaces/delete-modal.ts

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+export interface DeleteModalProps {
+  open: boolean
+  title: string
+  onConfirm: () => void
+  onCancel: () => void
+}

src/interfaces/floating-button.ts

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+export interface FloatingButtonProps {
+  onClick: () => void
+  label?: string
+}

src/interfaces/note-editor.ts

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+import type { Note, NotePatch } from '../types/note'
+
+export type EditorMode = 'create' | 'edit'
+
+export interface EditNoteEditorProps {
+  mode: 'edit'
+  note: Note
+  onUpdate: (id: number, patch: NotePatch) => void
+  onDelete: (id: number) => void
+}
+
+export interface CreateNoteEditorProps {
+  mode: 'create'
+  onCreate: (title: string, content: string) => void
+  onCancelCreate: () => void
+}
+
+export type NoteEditorProps = EditNoteEditorProps | CreateNoteEditorProps
+
+export interface NoteFormProps {
+  title: string
+  content: string
+  titleMissing: boolean
+  cancelLabel: string
+  onTitleChange: (value: string) => void
+  onContentChange: (value: string) => void
+  onCancel: () => void
+  onSubmit: () => void
+}

src/interfaces/note-list.ts

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+import type { Note } from '../types/note'
+
+export interface NoteListProps {
+  notes: Note[]
+  onSelect: (id: number) => void
+}

src/types/note.ts

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+export interface Note {
+  id: number
+  title: string
+  content: string
+}
+
+export type NotePatch = Partial<Pick<Note, 'title' | 'content'>>