chore(lint): declare contract callbacks property-style

unbound-method flags destructuring a method-style member (method
signatures are bivariant and exempt from the this-context check).
These contract members are all plain callbacks — declare them as
property-style function types so consumers can destructure them
without a false this-binding hazard. Type-level only.

packages/client/ui-conversation/src/client/contract/slots.ts

@@ -144,7 +144,7 @@ export interface ToolRowOwnerProps {
   /** Frozen call slice: the running call or the settled result node. */
   block: ToolCallBlock
   /** Open the details panel for this call (session-level facility, supplied by the view). */
-  openDetails(): void
+  openDetails: () => void
 }
 
 /**
@@ -175,21 +175,21 @@ export interface ConversationInjected {
    * Connect the selected Workspace and open its reusable/new blank session.
    * When a blank session is already current, carry its draft to the target.
    */
-  selectWorkspace(workspaceId: WorkspaceId): Promise<void>
+  selectWorkspace: (workspaceId: WorkspaceId) => Promise<void>
 }
 
 /** Business callbacks injected into the strict session content seat. */
 export interface ConversationSessionInjected {
   /** Views projected from the `conversation.view` slot ledger. */
   views: {
-    list(): readonly ViewTab[]
-    subscribe(fn: () => void): () => void
-    version(): number
+    list: () => readonly ViewTab[]
+    subscribe: (fn: () => void) => () => void
+    version: () => number
   }
   /** Bind the input machine's draft persistence mirror to the session store. */
-  bindDraftMirror(write: (text: string) => void): () => void
+  bindDraftMirror: (write: (text: string) => void) => () => void
   /** Select a real Session through the runtime navigation owner. */
-  open(sessionId: SessionId): void
+  open: (sessionId: SessionId) => void
 }
 
 /**
@@ -219,7 +219,7 @@ export interface ComposerBarInjected {
   /** The InputBar-exclusive keyboard/DOM command face (decision 20 private plane). */
   keyboard: ComposerKeyboard
   /** Cancel the in-flight turn. */
-  stop(): void
+  stop: () => void
 }
 
 /**
@@ -275,8 +275,8 @@ export type ConversationSessionSlotProps =
  */
 export interface ChatViewInjected {
   /** Selection write + details panel opening in one gesture (store action + layout orchestration). */
-  openDetails(target: SelectionTarget): void
-  loadOlder(): void
+  openDetails: (target: SelectionTarget) => void
+  loadOlder: () => void
 }
 
 /** Full chat-view component props: runtime share & the declared toolview hole's render share & store share & injected share. */
@@ -290,7 +290,7 @@ export type ChatViewSlotProps =
  */
 export interface DetailsInjected {
   /** Close the details panel (layout geometry stays with ctx.layout). */
-  closeDetails(): void
+  closeDetails: () => void
 }
 
 /** Full details-slot component props: selection arrives through the shared store, call material through useSession. */
@@ -300,6 +300,6 @@ export type DetailsSlotProps = PropsRuntime<'details'> & PropsStore<ChatStore> &
 export interface EmptyWorkspaceOwnerProps {
   open: boolean
   anchorRef?: RefObject<HTMLElement>
-  onPick(workspaceId: WorkspaceId): void
-  onClose(): void
+  onPick: (workspaceId: WorkspaceId) => void
+  onClose: () => void
 }