chore: remove unused draftTypes.ts to fix knip (#8993)

## Summary
- Remove `src/platform/workflow/persistence/base/draftTypes.ts` which is
not imported anywhere
- Fixes `knip` reporting it as an unused file

The file was added in #8517 but nothing consumes its exports yet.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8993-chore-remove-unused-draftTypes-ts-to-fix-knip-30d6d73d36508151a9e1e936864fd311)
by [Unito](https://www.unito.io)

src/platform/workflow/persistence/base/draftTypes.ts

@@ -1,85 +0,0 @@
-/**
- * V2 Workflow Persistence Type Definitions
- *
- * Two-layer state system:
- * - sessionStorage: Per-tab pointers (tiny, scoped by clientId)
- * - localStorage: Persistent drafts (per-workspace, per-draft keys)
- */
-
-/**
- * Metadata for a single draft entry stored in the index.
- * The actual workflow data is stored separately in a Draft payload key.
- */
-export interface DraftEntryMeta {
-  /** Workflow path (e.g., "workflows/Untitled.json") */
-  path: string
-  /** Display name of the workflow */
-  name: string
-  /** Whether this is an unsaved temporary workflow */
-  isTemporary: boolean
-  /** Last update timestamp (ms since epoch) */
-  updatedAt: number
-}
-
-/**
- * Draft index stored in localStorage.
- * Contains LRU order and metadata for all drafts in a workspace.
- *
- * Key: `Comfy.Workflow.DraftIndex.v2:${workspaceId}`
- */
-export interface DraftIndexV2 {
-  /** Schema version */
-  v: 2
-  /** Last update timestamp */
-  updatedAt: number
-  /** LRU order: oldest → newest (draftKey array) */
-  order: string[]
-  /** Metadata keyed by draftKey (hash of path) */
-  entries: Record<string, DraftEntryMeta>
-}
-
-/**
- * Individual draft payload stored in localStorage.
- *
- * Key: `Comfy.Workflow.Draft.v2:${workspaceId}:${draftKey}`
- */
-export interface DraftPayloadV2 {
-  /** Serialized workflow JSON */
-  data: string
-  /** Last update timestamp */
-  updatedAt: number
-}
-
-/**
- * Pointer stored in sessionStorage to track active workflow per tab.
- * Includes workspaceId for validation on read.
- *
- * Key: `Comfy.Workflow.ActivePath:${clientId}`
- */
-export interface ActivePathPointer {
-  /** Workspace ID for validation */
-  workspaceId: string
-  /** Path to the active workflow */
-  path: string
-}
-
-/**
- * Pointer stored in sessionStorage to track open workflow tabs.
- * Includes workspaceId for validation on read.
- *
- * Key: `Comfy.Workflow.OpenPaths:${clientId}`
- */
-export interface OpenPathsPointer {
-  /** Workspace ID for validation */
-  workspaceId: string
-  /** Ordered list of open workflow paths */
-  paths: string[]
-  /** Index of the active workflow in paths array */
-  activeIndex: number
-}
-
-/** Maximum number of drafts to keep per workspace */
-export const MAX_DRAFTS = 32
-
-/** Debounce delay for persisting graph changes (ms) */
-export const PERSIST_DEBOUNCE_MS = 512