feat(view): bearing 공통 규칙 inputs (mortar h2, bearing h3, solplate T, margin) and recalculated E, L, W, T1, T2

On the bearing card, four inputs drive E = h1 + h2 + h3 + h4, L = A + margin, W = B + margin and T1/T2 = T ± L·|S|/2. The
defaults are the drawing values, so every row gives back the drawing values; changed rows are marked. The values are screen
state for now and do not change the model or the project file (Q16 stays open).

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>

src/core/bearing-ref.ts

@@ -79,3 +79,25 @@ export function solplateTs(T: number, L: number, s: number): { T1: number; T2: n
   const half = (L * Math.abs(s)) / 200;
   return { T1: Math.round(T + half), T2: Math.round(T - half) };
 }
+
+/** 공통 규칙 (2단계, 승인 2026-10-23): inputs that drive E, L, W, T1, T2. Defaults are the drawing's values. */
+export interface BearingRules {
+  /** 모르타르 h2 (mm). */
+  h2: number;
+  /** 받침 높이 h3 (mm). */
+  h3: number;
+  /** 솔플레이트 중심 두께 T (mm). */
+  T: number;
+  /** 솔플 여유 (mm): L = A + margin, W = B + margin. */
+  margin: number;
+}
+
+export const BEARING_RULES_DEFAULT: BearingRules = { h2: 50, h3: 181, T: SOLPLATE_T_RULE, margin: 100 };
+
+/** Values of one bearing with the 공통 규칙 applied: E = h1 + h2 + h3 + h4, L = A + margin, W = B + margin, T1/T2 from T. */
+export function applyBearingRules(row: BearingRefRow, rules: BearingRules): { E: number; L: number; W: number; T1: number; T2: number } {
+  const sp = SOLPLATE_REF[row.no - 1];
+  const L = row.A + rules.margin;
+  const { T1, T2 } = solplateTs(rules.T, L, sp.s);
+  return { E: row.h1 + rules.h2 + rules.h3 + row.h4, L, W: row.B + rules.margin, T1, T2 };
+}