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.

tests/helpers.ts

@@ -8,9 +8,9 @@ import { type BearingPair, girderPairs } from '../src/core/bearing-pair';
 import { buildPier, type PierModel } from '../src/core/geometry';
 
 /** Spec workbook (RAG/Pier ui_xxx.xlsx, sheet intent.PR, all tables on one sheet). Used by single-sheet tests. */
-const SPEC_PATH = fileURLToPath(new URL('../public/samples/P1.xlsx', import.meta.url));
+const SPEC_PATH = fileURLToPath(new URL('../도면추출/samples/P1.xlsx', import.meta.url));
 /** User input (RAG/운곡교P1입력.xlsx, three sheets 교각 · IP · 받침). This is the P1 input used by the app and tests. */
-const INPUT_PATH = fileURLToPath(new URL('../public/samples/운곡교P1입력.xlsx', import.meta.url));
+const INPUT_PATH = fileURLToPath(new URL('../도면추출/samples/운곡교P1입력.xlsx', import.meta.url));
 
 export function loadWorkbook(path: string = SPEC_PATH): XLSX.WorkBook {
   return XLSX.read(readFileSync(path), { type: 'buffer' });