feat(plan): plan-task viewer shows Applicable Rules panel

frontend/src/components/rules/PlanRulesPanel.vue

@@ -0,0 +1,67 @@
+<script setup lang="ts">
+import { ref, onMounted, watch } from "vue";
+import { getProjectApplicableRules } from "@/api/rulebooks";
+import type { ApplicableRules } from "@/api/rulebooks";
+
+const props = defineProps<{ projectId: number }>();
+const data = ref<ApplicableRules | null>(null);
+
+function grouped(rules: ApplicableRules["rules"]) {
+  const g: Record<string, Record<string, ApplicableRules["rules"]>> = {};
+  for (const r of rules) {
+    (g[r.rulebook_title] ??= {});
+    (g[r.rulebook_title][r.topic_title] ??= []).push(r);
+  }
+  return g;
+}
+
+async function load() {
+  data.value = await getProjectApplicableRules(props.projectId);
+}
+
+onMounted(load);
+watch(() => props.projectId, load);
+</script>
+
+<template>
+  <section class="plan-rules" v-if="data && data.rules.length">
+    <h3>Applicable rules</h3>
+    <div v-for="(topics, rb) in grouped(data.rules)" :key="rb" class="rb">
+      <h4>{{ rb }}</h4>
+      <div v-for="(rules, topic) in topics" :key="topic">
+        <h5>{{ topic }}</h5>
+        <ul>
+          <li v-for="r in rules" :key="r.id">
+            <strong>{{ r.title }}</strong> — {{ r.statement }}
+          </li>
+        </ul>
+      </div>
+    </div>
+    <p v-if="data.truncated" class="truncated">
+      Truncated at 50 rules — more apply.
+    </p>
+  </section>
+</template>
+
+<style scoped>
+.plan-rules {
+  margin-top: 1.5rem;
+  border-top: 1px solid var(--color-border, #2a2a2e);
+  padding-top: 1rem;
+}
+.plan-rules h3 {
+  font-size: 0.9em; opacity: 0.7;
+  text-transform: uppercase; letter-spacing: 0.05em;
+}
+.rb h4 { font-family: Fraunces, serif; font-style: italic; margin-bottom: 0.25rem; }
+.rb h5 {
+  font-size: 0.8em; opacity: 0.7;
+  text-transform: uppercase; margin-top: 0.5rem;
+}
+.plan-rules ul {
+  list-style: none; padding-left: 0.75rem; margin: 0.25rem 0;
+  border-left: 2px solid var(--color-primary, #6366f1);
+}
+.plan-rules li { margin: 0.35rem 0; font-size: 0.92em; }
+.truncated { opacity: 0.7; font-style: italic; font-size: 0.85em; }
+</style>

frontend/src/views/TaskViewerView.vue

@@ -10,6 +10,7 @@ import type { Note } from "@/types/note";
 import type { TaskStatus } from "@/types/task";
 import StatusBadge from "@/components/StatusBadge.vue";
 import PriorityBadge from "@/components/PriorityBadge.vue";
+import PlanRulesPanel from "@/components/rules/PlanRulesPanel.vue";
 import TagPill from "@/components/TagPill.vue";
 import TableOfContents from "@/components/TableOfContents.vue";
 import ShareDialog from "@/components/ShareDialog.vue";
@@ -379,6 +380,12 @@ const subTaskProgress = computed(() => {
           @click="onBodyClick"
         ></div>
 
+        <!-- Applicable rules (plan tasks only) -->
+        <PlanRulesPanel
+          v-if="store.currentTask.task_kind === 'plan' && store.currentTask.project_id"
+          :project-id="store.currentTask.project_id"
+        />
+
         <!-- Sub-tasks -->
         <div v-if="subTasks.length" class="subtasks">
           <div class="subtasks-header">