refactor(fe): SellDecisionPage - EditFormPage pattern

- Migrate from PageLayout to EditFormPage (standard form pattern)
- Add state management (PROCESSING/ERROR/READY)
- Separate form input and result preview sections
- Use #preview slot for policy evaluation results
- Add evidence tracking (asOf, version)
- Add dirty state (form has potential changes)
- Improve result display: semantic HTML (dl/dt/dd)
- Add CSS styles for result presentation

Result: Consistent form pattern across all research tools

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

frontend/src/features/sell-decision/pages/SellDecisionPage.vue

@@ -1,11 +1,12 @@
 <script setup lang="ts">
 import { computed, ref } from 'vue'
-import PageLayout from '../../../shared/ui/layouts/PageLayout.vue'
+import EditFormPage from '../../../shared/ui/screen-types/v2/EditFormPage.vue'
 import QueryStateBoundary from '../../../shared/ui/QueryStateBoundary.vue'
 import { KsButton, KsCheckbox, KsFormGrid, KsFormSection, KsNumberField } from '../../../shared/ui/components'
 import PolicyTracePanel from '../components/PolicyTracePanel.vue'
 import { useEvaluateResearchSellPolicy } from '../queries'
 import type { ResearchSellPolicyCommand } from '../api'
+import type { StandardScreenState } from '../../../shared/ui/contracts/screenContract'
 
 const mutation = useEvaluateResearchSellPolicy()
 const hardImpairmentApproved = ref(false)
@@ -14,7 +15,20 @@ const gapBelowFloorAtr = ref(1.6)
 const consecutiveCloseBreaches = ref(0)
 const lastCommand = ref<ResearchSellPolicyCommand | null>(null)
 
+const evidence = {
+  asOf: new Date().toISOString(),
+  version: 'v60-T13-ResearchSellPolicy',
+}
+
 const isBusy = computed(() => mutation.isPending.value)
+const dirty = computed(() => true) // Form always has potential changes until submitted
+
+const screenState = computed<StandardScreenState>(() => {
+  if (isBusy.value) return 'PROCESSING'
+  if (mutation.error.value) return 'ERROR'
+  if (!mutation.data.value) return 'READY'
+  return 'READY'
+})
 
 function createCommand(): ResearchSellPolicyCommand {
   const asOf = new Date().toISOString()
@@ -55,45 +69,102 @@ function run() {
 function retry() {
   if (lastCommand.value) mutation.mutate(lastCommand.value)
 }
+
 </script>
 
 <template>
-  <PageLayout title="매도 정책 연구 콘솔" subtitle="순수 정책 계약과 우선순위를 확인하는 연구 전용 화면입니다. 고객 제안·공개·주문 기능과 연결되지 않습니다." status="RESEARCH_CANDIDATE_NOT_PRODUCTION · 자동주문 OFF">
-    <form @submit.prevent="run">
-      <KsFormSection title="연구 입력 벡터">
-        <KsFormGrid :columns="2" aria-label="연구 입력 벡터">
-          <KsCheckbox v-model="hardImpairmentApproved" label="Hard impairment 승인" :disabled="isBusy" />
-          <KsCheckbox v-model="capitalFloorBreached" label="자본바닥 위반" :disabled="isBusy" />
-          <KsNumberField v-model="gapBelowFloorAtr" label="보호선 이탈 ATR" :min="0" :max-fraction-digits="2" :disabled="isBusy" />
-          <KsNumberField v-model="consecutiveCloseBreaches" label="연속 종가 이탈" :min="0" :max-fraction-digits="0" :disabled="isBusy" />
-        </KsFormGrid>
-        <template #actions>
-          <KsButton type="submit" label="정책 평가" :loading="isBusy" />
-        </template>
-      </KsFormSection>
-    </form>
+  <EditFormPage
+    title="매도 정책 연구 콘솔"
+    subtitle="순수 정책 계약과 우선순위를 확인하는 연구 전용 화면입니다. 고객 제안·공개·주문 기능과 연결되지 않습니다."
+    :state="screenState"
+    :dirty="dirty"
+    :evidence="evidence"
+    @submit="run"
+    @retry="retry"
+  >
+    <!-- Form Input Section -->
+    <KsFormSection title="연구 입력 벡터">
+      <KsFormGrid :columns="2" aria-label="연구 입력 벡터">
+        <KsCheckbox v-model="hardImpairmentApproved" label="Hard impairment 승인" :disabled="isBusy" />
+        <KsCheckbox v-model="capitalFloorBreached" label="자본바닥 위반" :disabled="isBusy" />
+        <KsNumberField v-model="gapBelowFloorAtr" label="보호선 이탈 ATR" :min="0" :max-fraction-digits="2" :disabled="isBusy" />
+        <KsNumberField v-model="consecutiveCloseBreaches" label="연속 종가 이탈" :min="0" :max-fraction-digits="0" :disabled="isBusy" />
+      </KsFormGrid>
+    </KsFormSection>
 
-    <QueryStateBoundary
-      :loading="isBusy"
-      :error="mutation.error.value as Error | null"
-      :empty="!mutation.data.value"
-      @retry="retry"
-    >
-      <dl v-if="mutation.data.value" class="ks-stack">
-        <dt>행동</dt><dd>{{ mutation.data.value.action }}</dd>
-        <dt>정책</dt><dd>{{ mutation.data.value.policyId }}</dd>
-        <dt>사유</dt><dd>{{ mutation.data.value.reasonCode }}</dd>
-        <dt>Lot 매도비율</dt><dd>{{ mutation.data.value.sellRatioOfLot }}</dd>
-        <dt>매도 후 종목 비중</dt><dd>{{ mutation.data.value.targetSecurityPortfolioWeightAfter }}</dd>
-        <dt>재진입 가능</dt><dd>{{ mutation.data.value.reentryEligible }}</dd>
-        <dt>결정 계약</dt><dd>{{ mutation.data.value.decisionContractVersion }}</dd>
-        <dt>정책 추적</dt><dd>{{ mutation.data.value.policyTrace.length }}단계</dd>
-      </dl>
-      <PolicyTracePanel
-        v-if="mutation.data.value"
-        :entries="mutation.data.value.policyTrace"
-        :schema-version="mutation.data.value.policyTraceSchemaVersion"
-      />
-    </QueryStateBoundary>
-  </PageLayout>
+    <!-- Result Preview Section -->
+    <template #preview>
+      <QueryStateBoundary
+        :loading="isBusy"
+        :error="mutation.error.value as Error | null"
+        :empty="!mutation.data.value"
+        @retry="retry"
+      >
+        <div v-if="mutation.data.value" class="result-content">
+          <h3>정책 평가 결과</h3>
+          <dl class="ks-stack">
+            <div class="result-row"><dt>행동</dt><dd>{{ mutation.data.value.action }}</dd></div>
+            <div class="result-row"><dt>정책</dt><dd>{{ mutation.data.value.policyId }}</dd></div>
+            <div class="result-row"><dt>사유</dt><dd>{{ mutation.data.value.reasonCode }}</dd></div>
+            <div class="result-row"><dt>Lot 매도비율</dt><dd>{{ mutation.data.value.sellRatioOfLot }}</dd></div>
+            <div class="result-row"><dt>매도 후 종목 비중</dt><dd>{{ mutation.data.value.targetSecurityPortfolioWeightAfter }}</dd></div>
+            <div class="result-row"><dt>재진입 가능</dt><dd>{{ mutation.data.value.reentryEligible }}</dd></div>
+            <div class="result-row"><dt>결정 계약</dt><dd>{{ mutation.data.value.decisionContractVersion }}</dd></div>
+            <div class="result-row"><dt>정책 추적</dt><dd>{{ mutation.data.value.policyTrace.length }}단계</dd></div>
+          </dl>
+          <PolicyTracePanel
+            :entries="mutation.data.value.policyTrace"
+            :schema-version="mutation.data.value.policyTraceSchemaVersion"
+          />
+        </div>
+      </QueryStateBoundary>
+    </template>
+  </EditFormPage>
 </template>
+
+<style scoped>
+.result-content {
+  display: flex;
+  flex-direction: column;
+  gap: var(--spacing-3);
+}
+
+.result-content h3 {
+  margin: 0;
+  font-size: var(--font-size-lg);
+  font-weight: var(--font-weight-semibold);
+  color: var(--color-text-primary);
+}
+
+.ks-stack {
+  display: flex;
+  flex-direction: column;
+  gap: var(--spacing-2);
+  margin: 0;
+  padding: 0;
+}
+
+.result-row {
+  display: flex;
+  justify-content: space-between;
+  padding: var(--spacing-2) 0;
+  border-bottom: 1px solid var(--color-border-secondary);
+}
+
+.result-row:last-child {
+  border-bottom: none;
+}
+
+.result-row dt {
+  font-weight: var(--font-weight-semibold);
+  color: var(--color-text-primary);
+  flex-shrink: 0;
+}
+
+.result-row dd {
+  margin: 0;
+  text-align: right;
+  color: var(--color-text-secondary);
+  font-family: monospace;
+}
+</style>