chore(lint): apply eslint auto-fixes across the .tsx backlog

Mechanical --fix output over the newly linted .tsx files (indent,
arrow-parens, comma-dangle, member-delimiter-style, unnecessary type
assertions), plus the three generic-arrow test hooks converted to
function declarations up front: the comma-dangle fixer strips the
<T,> disambiguation comma and turns them into parse errors otherwise.

packages/client/ui-conversation/tests/chat-code-subcalls.spec.tsx

@@ -59,7 +59,7 @@ function snapshotWith(
     pending: [], queue: [], todos: [], running: runningCalls.length > 0, composerPhase: 'active', removed: false,
     openState: 'open', openError: null,
     hasMore: false, loadingOlder: false, promptError: null, blank: false, lastAgentError: null,
-  } as ConversationSnapshot
+  }
 }
 
 /** Test-owned AppFrame role: declares and renders the resident conversation area. */