test: adapt suites to the provider-hosted conversation shell

Test-side catch-up with the session-maybe conversation architecture: the
provide channel's descriptor shape and maybeProvideInfo in fakes, the shared
chat-store handle asserted on conversation.session (the session-maybe shell
carries no store), startSession fakes exposing the workspace list snapshot,
strict session slots declining (not throwing) without a session, AppFrame's
removed empty seat and loading gate, and the hero draft asserted on the
machine (the chat-store mirror binds with ConversationSession). Plus three
lint fixes (max-len split, boolean-compare, arrow-parens/unbound-method).

packages/client/ui-sidebar/tests/apply.spec.tsx

@@ -9,7 +9,10 @@ async function bench(declare = true) {
   const ctx = new Context()
   await ctx.plugin(SlotsService).await()
   const layout = { toggleSidebar: vi.fn() }
-  const workspaces = { connectWorkspace: vi.fn(async () => 'blank-1' as never) }
+  const workspaces = {
+    connectWorkspace: vi.fn(async () => 'blank-1' as never),
+    list: { getSnapshot: () => ({ recentWorkspaceId: undefined }) },
+  }
   const sessions = { open: vi.fn(), clear: vi.fn() }
   ctx.provide('layout', layout)
   ctx.provide('sessions', sessions as never)