Merge origin/master with current Pierzainer development

Preserve local abutment, cast-in-place rebar and compact header features alongside remote drawing, ground-link and quantity workspaces. Adapt drawing and takeoff consumers to generated solplate plans, retain current P1 regression coverage, and resolve bearing-detail annotation collisions.

Validation: 122 test files / 975 tests passed; production build passed; 10 browser integration checks passed.

index.html

@@ -17,6 +17,7 @@
           <button id="nav-shape" class="step current" data-label="① 형상 생성" aria-label="① 형상 생성" type="button" aria-current="step">① 형상 <em id="step1-status"></em></button>
           <button id="nav-plan" class="step" data-label="② 형상계획" aria-label="② 형상계획" type="button">② 계획 <em id="step2-status"></em></button>
           <button id="nav-rebar" class="step" data-label="③ 철근배근" aria-label="③ 철근배근" type="button">③ 배근 <em id="step3-status"></em></button>
+          <button id="nav-drawing" class="step" data-label="④ 도면작성" aria-label="④ 도면작성" type="button">④ 도면 <em id="step-drawing-status"></em></button>
         </nav>
         <div class="actions">
           <span id="save-status" class="savest">저장 전</span>
@@ -266,6 +267,8 @@
         </aside>
       </main>
 
+      <main id="view-drawing" hidden aria-label="교각 일반도 작성"></main>
+
       <main class="grid quantity" id="view-quantity" hidden>
         <aside class="panel piers" aria-labelledby="quantity-pier-title">
           <p id="quantity-pier-title" class="lbl">교각 목록</p>