refactor(layout-review): consolidate tool-header actions + align reconcile downloads

Consistency pass over the parallel-agent work:
- Replace 4 divergent inline header wrappers (flex/inline-flex, gap
  10/12px, margin-top present/absent across 8 tool pages) with one shared
  .dt-tool-header-actions class; strip the now-redundant per-button
  margin-top:0. Every tool header now aligns the local-first pill + Help
  button identically.
- Reconcile downloads row: reorder to the page's exceptions-first order
  (Review, Unmatched left, Unmatched right, Matched) to match the tabs and
  metric strip, and drop the lone competing primary — the four are
  parallel exports of equal weight.

Audited and confirmed already-consistent: compact intake banner, privacy
pill markup, .dt-next-step strips, the three coming-soon stubs, primary
CTAs, and the 3-download CSV/audit/config pattern.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

layout-review/app.css

@@ -212,6 +212,11 @@ code, .dt-mono { font-family: var(--font-mono); font-size: 0.92em; font-feature-
 }
 .dt-help-btn .dt-mi { font-family: "Material Symbols Outlined"; font-size: 18px; }
 .dt-tool-caption { font-size: 12.5px; color: var(--ink-tertiary); line-height: 1.5; margin: 2px 0 0; }
+/* Right-side actions cluster in a tool header: the local-first privacy pill +
+   the Help button. One shared class so every tool page aligns identically
+   (replaces per-page inline flex/gap/margin drift). */
+.dt-tool-header-actions { display: flex; align-items: center; gap: 12px; flex-shrink: 0; margin-top: 6px; }
+.dt-tool-header-actions .dt-help-btn { margin-top: 0; }
 
 /* ===========================================================================
    Buttons