Fix lint findings and calibrate the seat trigger to the figma mock

- unused SessionId import and an unnecessary assertion in ui-model
- two over-length fake-api lines split
- trigger chrome calibrated against figma 313:14108's ToggleButton
  (13/20 medium secondary at 28px; chevron in label-caption = the mock's
  #ADB2B8; the mock's leading icon is invisible there, so the seat has
  none, and its 'High' effort text has no wire concept to render)

packages/client/runtime/tests/fake-api.ts

@@ -127,7 +127,8 @@ export class FakeApiClient implements IApiClient {
   // wire shapes so cases can program requires-bearing catalogs and dual-address
   // skill lists without casts.
   onCommandList: (payload: unknown) => Promise<RpcResponse<{ commands: CommandDescriptor[] }>> = () => Promise.resolve(ok({ commands: [] }))
-  onCommandExecute: (payload: unknown) => Promise<RpcResponse<{ matched: boolean; result?: CommandExecuteResult }>> = () => Promise.resolve(ok({ matched: false }))
+  onCommandExecute: (payload: unknown) => Promise<RpcResponse<{ matched: boolean; result?: CommandExecuteResult }>> =
+    () => Promise.resolve(ok({ matched: false }))
   onSkillList: (payload: unknown) => Promise<RpcResponse<{ skills: SkillEntry[] }>> = () => Promise.resolve(ok({ skills: [] }))
 
   readonly commands: IApiClient['commands'] = {