refactor(01-02): decompose execution.tsx and automation.tsx into focused sub-components

- execution.tsx (1749 lines) -> 16 focused files under 300 lines each:
  TaskQueue, TaskInspector, TaskCreator, TaskComments, ApprovalList,
  ApprovalInspector, ActivityList, CostList, BudgetSummary, WorkspaceList,
  WorkspaceInspector, WorkspaceCreator, SecretCreator, SettingsPane,
  PendingReviewList, execution-utils
- automation.tsx (1697 lines) -> 6 focused files under 300 lines each:
  AutomationPanel, RuleCard, RuleEditor, WorkflowList, WorkflowEditor,
  automation-config
- Both original files replaced with backward-compatible re-exports
- All sub-components under 300 lines, TypeScript compilation passes

src/renderer/components/execution/ApprovalList.tsx

@@ -0,0 +1,21 @@
+import type { ApprovalRecord } from "@shared/types"
+import { useT } from "../../i18n"
+import { EmptyState, ListFrame, StatusPill } from "../ui"
+
+export function ApprovalList({ approvals, selectedApprovalId, onSelect }: { approvals: ApprovalRecord[]; selectedApprovalId: string | null; onSelect: (id: string) => void }) {
+  const t = useT()
+  if (approvals.length === 0) return <EmptyState title={t("exec.noApprovals")} />
+  return (
+    <ListFrame>
+      {approvals.map((approval) => (
+        <button key={approval.id} className={`focus-ring relative w-full border-b border-[color:var(--line)] px-5 py-4 text-left transition last:border-b-0 ${selectedApprovalId === approval.id ? "bg-transparent" : "bg-transparent hover:bg-[color:var(--panel-soft)]"}`} onClick={() => onSelect(approval.id)}>
+          {selectedApprovalId === approval.id ? <span className="absolute inset-y-3 left-0 w-0.5 rounded-full bg-[color:var(--warn)]" /> : null}
+          <div className="flex items-center justify-between gap-4">
+            <div className={`text-[15px] text-[color:var(--text)] ${selectedApprovalId === approval.id ? "font-semibold" : "font-medium"}`}>{approval.payloadSummary}</div>
+            <StatusPill status={approval.state} />
+          </div>
+        </button>
+      ))}
+    </ListFrame>
+  )
+}