feat(mira): 7B.3g wiki UI 樹狀渲染 + 跨 wiki 連結

對應 polaris/mira/.agents/specs/mira-app/design.md §5.2 + §3.5.12。

`/mira/wiki/[pageName]`：
- 抓 wiki-page 後平行撈所有 wiki-paragraph / triplet / wiki-page，client-side 用 parent_id filter
  （KBDB 沒 parent_id server filter，且 tag filter 還有 KI-3 bug）
- 按 facet 分區渲染：facet 標題 + paragraph markdown + 該段的 triplets
- facet 預設展開（看一篇要看內容）/ triplets 預設折疊（leo Logseq outliner 習慣）
- **triplet A/B 拆字串 「A >> 關係 >> B」**，若 A 或 B 對得上既有 wiki entity → render 成 <Link>
  跨 wiki 跳轉，是 Wikipedia-like 體驗的關鍵
- fallback：非 wiki-page block（schema/index/log 等）直接 render content

`/mira/wiki`：列表用 wiki-page 的 content (= entity 名稱) 當標題，不是 page_name slug。

mira.css 加 `.mira-wiki-detail` 不破版 + h2 底線，避免長 cypher 字串撐爆右邊界。

TS check pass。

landing/app/mira/mira.css

@@ -755,3 +755,23 @@
 .mira-app .mira-rel-time {
   cursor: default;
 }
+
+/* ── Wiki detail (7B.3g 樹狀渲染) ── */
+/* .mira-md 已在 §190+ 定義整套 markdown 樣式（河道+wiki 共用），這裡只加 wiki 細節頁的「不破版」保護 */
+.mira-app .mira-wiki-detail {
+  overflow-wrap: break-word;
+  word-break: break-word;
+}
+
+/* 防止長 cypher binding 字串 / URL 撐爆右邊界 */
+.mira-app .mira-wiki-detail .mira-md li,
+.mira-app .mira-wiki-detail .mira-md p {
+  overflow-wrap: break-word;
+  word-break: break-word;
+}
+
+/* wiki h2/h3 加底線分隔，更像文章 */
+.mira-app .mira-wiki-detail .mira-md h2 {
+  border-bottom: 1px solid var(--mira-line-soft);
+  padding-bottom: 4px;
+}

landing/app/mira/wiki/[pageName]/page.tsx

@@ -3,12 +3,13 @@
 export const runtime = 'edge';
 
 // Mira Wiki 單篇頁
-// SDD: polaris/mira/.agents/specs/mira-app/design.md §5.2 + §3.5.7
-// 對應 task: 7C.2
+// SDD: polaris/mira/.agents/specs/mira-app/design.md §5.2 + §3.5.12
+// 對應 task: 7C.2 + 7B.3g
 // 路由：/mira/wiki/[pageName]
-// 顯示單一 wiki block + 它的 children（wiki-paragraph）
+// 顯示：wiki-page parent → wiki-paragraph children (按 facet 分區) → triplet grandchildren
+// 7B.3g 升級：樹狀渲染 + 折疊 + triplet 跨 wiki 連結化
 
-import { useEffect, useState, use } from 'react';
+import { useEffect, useMemo, useState, use } from 'react';
 import Link from 'next/link';
 import { MarkdownView } from '../../_shared/markdown';
 import '../../mira.css';
@@ -18,15 +19,24 @@ const API_BASE = process.env.NEXT_PUBLIC_API_BASE ?? 'https://cypher.arcrun.dev'
 
 type Block = {
   id: string;
-  page_name: string;
+  page_name: string | null;
   content: string;
   type: string;
   parent_id: string | null;
   tags_json: string | null;
+  source: string | null;
   created_at: number;
   updated_at: number;
 };
 
+type FacetGroup = {
+  facet: string;
+  paragraphs: Array<{
+    block: Block;
+    triplets: Block[];
+  }>;
+};
+
 export default function WikiPagePage({
   params,
 }: {
@@ -34,8 +44,12 @@ export default function WikiPagePage({
 }) {
   const { pageName } = use(params);
   const decodedName = decodeURIComponent(pageName);
+
   const [block, setBlock] = useState<Block | null>(null);
-  const [siblings, setSiblings] = useState<Block[]>([]);
+  const [paragraphs, setParagraphs] = useState<Block[]>([]);
+  const [triplets, setTriplets] = useState<Block[]>([]);
+  const [entitySet, setEntitySet] = useState<Set<string>>(new Set());
+  const [collapsed, setCollapsed] = useState<Record<string, boolean>>({});
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
 
@@ -48,25 +62,61 @@ export default function WikiPagePage({
         const me = (await meRes.json()) as { api_key: string };
         const headers = { Authorization: `Bearer ${me.api_key}` };
 
-        const res = await fetch(
+        // 1. 抓 wiki-page parent block by page_name
+        const pageRes = await fetch(
           `${KBDB_BASE}/blocks?page_name=${encodeURIComponent(decodedName)}&limit=1`,
           { headers },
         );
-        if (!res.ok) throw new Error(`KBDB ${res.status}`);
-        const data = await res.json();
-        const found: Block | undefined = data.blocks?.[0];
+        if (!pageRes.ok) throw new Error(`KBDB ${pageRes.status}`);
+        const pageData = await pageRes.json();
+        const wikiPage: Block | undefined = pageData.blocks?.[0];
         if (cancelled) return;
-        if (!found) {
+        if (!wikiPage) {
           setError(`找不到 wiki page：${decodedName}`);
           return;
         }
-        setBlock(found);
+        setBlock(wikiPage);
 
-        // 若這是個 child block，撈 parent 下其他 siblings 給導航用
-        if (found.parent_id) {
-          // KBDB 沒 children endpoint，用 page_name 找不到 siblings；先略過
-          setSiblings([]);
+        // 2. 平行撈所有 wiki-paragraph + triplet + wiki-page（跨 wiki 連結用），客戶端 filter by parent_id
+        //    KBDB 沒 parent_id server filter（兼 tag filter 還有 KI-3 bug），用 source+type 取再 client-side filter
+        const [paraRes, tripRes, pageListRes] = await Promise.all([
+          fetch(`${KBDB_BASE}/blocks?source=ai-canon-wiki&type=wiki-paragraph&limit=500`, { headers }),
+          fetch(`${KBDB_BASE}/blocks?source=ai-canon-wiki&type=triplet&limit=1000`, { headers }),
+          fetch(`${KBDB_BASE}/blocks?source=ai-canon-wiki&type=wiki-page&limit=500`, { headers }),
+        ]);
+        if (!paraRes.ok || !tripRes.ok || !pageListRes.ok) {
+          throw new Error('KBDB tree fetch failed');
         }
+        const paraData = await paraRes.json();
+        const tripData = await tripRes.json();
+        const pageListData = await pageListRes.json();
+        if (cancelled) return;
+
+        const allParas: Block[] = paraData.blocks ?? [];
+        const allTrips: Block[] = tripData.blocks ?? [];
+        const allPages: Block[] = pageListData.blocks ?? [];
+
+        // 該 wiki-page 的 paragraphs
+        const myParas = allParas
+          .filter((p) => p.parent_id === wikiPage.id)
+          .sort((a, b) => a.created_at - b.created_at);
+        setParagraphs(myParas);
+
+        // 該 wiki-page 範圍內所有 paragraph 的 triplets
+        const paraIdSet = new Set(myParas.map((p) => p.id));
+        const myTrips = allTrips.filter((t) => t.parent_id && paraIdSet.has(t.parent_id));
+        setTriplets(myTrips);
+
+        // 跨 wiki 連結用：所有 wiki-page 的 entity 名稱（content 就是 entity）
+        // 額外把 page_name 也加入（page_name=wiki-{entity}）
+        const eset = new Set<string>();
+        for (const p of allPages) {
+          if (p.content) eset.add(p.content.trim());
+          if (p.page_name?.startsWith('wiki-')) {
+            eset.add(p.page_name.slice(5).trim());
+          }
+        }
+        setEntitySet(eset);
       } catch (e: any) {
         if (!cancelled) setError(e?.message ?? 'load failed');
       } finally {
@@ -79,56 +129,79 @@ export default function WikiPagePage({
     };
   }, [decodedName]);
 
-  const tags = parseTags(block?.tags_json);
-  const subtype = tags
-    .find((t) => t.startsWith('subtype:'))
-    ?.replace('subtype:', '');
+  // 按 facet 分區
+  const facetGroups = useMemo<FacetGroup[]>(() => {
+    const groups: Map<string, Array<{ block: Block; triplets: Block[] }>> = new Map();
+    for (const p of paragraphs) {
+      const facet = extractFacet(p.tags_json) ?? '未分類';
+      const myTrips = triplets.filter((t) => t.parent_id === p.id);
+      if (!groups.has(facet)) groups.set(facet, []);
+      groups.get(facet)!.push({ block: p, triplets: myTrips });
+    }
+    return Array.from(groups.entries()).map(([facet, paragraphs]) => ({ facet, paragraphs }));
+  }, [paragraphs, triplets]);
+
+  const entity = block?.content?.trim() || decodedName.replace(/^wiki-/, '');
+  const isWikiPage = block?.type === 'wiki-page';
+
+  function toggleCollapse(key: string) {
+    setCollapsed((c) => ({ ...c, [key]: !c[key] }));
+  }
 
   return (
     <main className="mira-app">
-      <div className="mira-content">
+      <div className="mira-content mira-wiki-detail">
         <header style={{ padding: '24px 0 16px', borderBottom: '1px solid #2a2a2a' }}>
-          <div style={{ display: 'flex', alignItems: 'center', gap: 12, marginBottom: 4 }}>
-            <Link
-              href="/mira/wiki"
-              style={{ color: '#888', fontSize: 14, textDecoration: 'none' }}
-            >
-              ← Wiki 索引
-            </Link>
-          </div>
-          <h1 style={{ fontSize: 24, fontWeight: 700, color: '#fff', margin: 0 }}>
-            {decodedName}
+          <Link
+            href="/mira/wiki"
+            style={{ color: '#888', fontSize: 14, textDecoration: 'none' }}
+          >
+            ← Wiki 索引
+          </Link>
+          <h1 style={{ fontSize: 28, fontWeight: 700, color: '#fff', margin: '8px 0 4px' }}>
+            {entity}
           </h1>
-          {subtype && (
-            <div style={{ marginTop: 6 }}>
-              <span
-                style={{
-                  display: 'inline-block',
-                  padding: '2px 8px',
-                  fontSize: 11,
-                  background: '#2a2a3a',
-                  color: '#aab',
-                  borderRadius: 3,
-                }}
-              >
-                subtype: {subtype}
-              </span>
+          {block && (
+            <div style={{ color: '#666', fontSize: 12 }}>
+              {block.type} ・ updated {new Date(block.updated_at * 1000).toLocaleString('zh-TW')}
             </div>
           )}
         </header>
 
         {loading && <div style={{ padding: 24, color: '#666' }}>載入中⋯</div>}
-        {error && (
-          <div style={{ padding: 24, color: '#e66' }}>{error}</div>
-        )}
+        {error && <div style={{ padding: 24, color: '#e66' }}>{error}</div>}
 
         {block && !loading && !error && (
           <>
-            <article style={{ padding: '20px 0' }}>
-              <MarkdownView text={block.content} />
-            </article>
+            {/* wiki-page tree view */}
+            {isWikiPage && facetGroups.length > 0 && (
+              <article style={{ padding: '8px 0 24px' }}>
+                {facetGroups.map((group) => (
+                  <FacetSection
+                    key={group.facet}
+                    group={group}
+                    entitySet={entitySet}
+                    collapsed={collapsed}
+                    toggleCollapse={toggleCollapse}
+                  />
+                ))}
+              </article>
+            )}
 
-            {/* 7C.3 contribution log placeholder（此頁是 schema/index/log infra 而非 wiki-page，先不顯示） */}
+            {/* wiki-page 但沒 children：fallback render content */}
+            {isWikiPage && facetGroups.length === 0 && (
+              <article style={{ padding: '8px 0 24px', color: '#888' }}>
+                <em>尚無段落（wiki_synthesis 還沒跑出 children）</em>
+                <MarkdownView text={block.content} />
+              </article>
+            )}
+
+            {/* 非 wiki-page（schema / index / log / index-entry 等）：直接 render content */}
+            {!isWikiPage && (
+              <article style={{ padding: '20px 0' }}>
+                <MarkdownView text={block.content} />
+              </article>
+            )}
 
             <footer
               style={{
@@ -140,13 +213,17 @@ export default function WikiPagePage({
             >
               <div>id: <span style={{ fontFamily: 'monospace' }}>{block.id}</span></div>
               <div>type: {block.type}</div>
+              {block.source && <div>source: {block.source}</div>}
               {block.parent_id && (
                 <div>
                   parent: <span style={{ fontFamily: 'monospace' }}>{block.parent_id}</span>
                 </div>
               )}
-              {tags.length > 0 && <div>tags: {tags.join(', ')}</div>}
-              <div>updated: {new Date(block.updated_at * 1000).toLocaleString('zh-TW')}</div>
+              {paragraphs.length > 0 && (
+                <div>
+                  {paragraphs.length} paragraph(s) ・ {triplets.length} triplet(s)
+                </div>
+              )}
             </footer>
           </>
         )}
@@ -155,11 +232,159 @@ export default function WikiPagePage({
   );
 }
 
-function parseTags(tags_json: string | null | undefined): string[] {
-  if (!tags_json) return [];
+function FacetSection({
+  group,
+  entitySet,
+  collapsed,
+  toggleCollapse,
+}: {
+  group: FacetGroup;
+  entitySet: Set<string>;
+  collapsed: Record<string, boolean>;
+  toggleCollapse: (key: string) => void;
+}) {
+  const key = `facet:${group.facet}`;
+  const isCollapsed = collapsed[key] ?? false; // 預設展開（leo 看一篇 wiki 時要看內容）
+
+  return (
+    <section style={{ margin: '16px 0', borderLeft: '3px solid #2a3a4a', paddingLeft: 14 }}>
+      <button
+        onClick={() => toggleCollapse(key)}
+        style={{
+          background: 'transparent',
+          border: 'none',
+          color: '#aab',
+          fontSize: 16,
+          fontWeight: 600,
+          padding: '4px 0',
+          cursor: 'pointer',
+          textAlign: 'left',
+          width: '100%',
+        }}
+      >
+        {isCollapsed ? '▸' : '▾'} {group.facet}
+        <span style={{ color: '#555', fontWeight: 400, fontSize: 13, marginLeft: 8 }}>
+          ({group.paragraphs.length})
+        </span>
+      </button>
+      {!isCollapsed &&
+        group.paragraphs.map((p) => (
+          <ParagraphBlock
+            key={p.block.id}
+            block={p.block}
+            triplets={p.triplets}
+            entitySet={entitySet}
+            collapsed={collapsed}
+            toggleCollapse={toggleCollapse}
+          />
+        ))}
+    </section>
+  );
+}
+
+function ParagraphBlock({
+  block,
+  triplets,
+  entitySet,
+  collapsed,
+  toggleCollapse,
+}: {
+  block: Block;
+  triplets: Block[];
+  entitySet: Set<string>;
+  collapsed: Record<string, boolean>;
+  toggleCollapse: (key: string) => void;
+}) {
+  const tripKey = `trip:${block.id}`;
+  const tripsCollapsed = collapsed[tripKey] ?? true; // triplets 預設折疊
+
+  return (
+    <div style={{ margin: '12px 0 16px', paddingLeft: 4 }}>
+      <div style={{ color: '#ddd', lineHeight: 1.7 }}>
+        <MarkdownView text={block.content} />
+      </div>
+      {triplets.length > 0 && (
+        <div style={{ marginTop: 8 }}>
+          <button
+            onClick={() => toggleCollapse(tripKey)}
+            style={{
+              background: 'transparent',
+              border: 'none',
+              color: '#666',
+              fontSize: 12,
+              padding: '2px 0',
+              cursor: 'pointer',
+            }}
+          >
+            {tripsCollapsed ? '▸' : '▾'} 關係 ({triplets.length})
+          </button>
+          {!tripsCollapsed && (
+            <ul style={{ listStyle: 'none', padding: '4px 0 0 12px', margin: 0 }}>
+              {triplets.map((t) => (
+                <li
+                  key={t.id}
+                  style={{
+                    color: '#888',
+                    fontSize: 13,
+                    padding: '2px 0',
+                    fontFamily: 'monospace',
+                  }}
+                >
+                  <TripletRender content={t.content} entitySet={entitySet} />
+                </li>
+              ))}
+            </ul>
+          )}
+        </div>
+      )}
+    </div>
+  );
+}
+
+/** Render triplet "A >> 關係 >> B" with A/B linkified if they match an existing wiki entity */
+function TripletRender({
+  content,
+  entitySet,
+}: {
+  content: string;
+  entitySet: Set<string>;
+}) {
+  // 切「>>」分 A / 關係 / B
+  const parts = content.split('>>').map((s) => s.trim());
+  if (parts.length !== 3) {
+    return <>{content}</>;
+  }
+  const [a, rel, b] = parts;
+  return (
+    <>
+      <EntityLink name={a} entitySet={entitySet} />{' '}
+      <span style={{ color: '#666' }}>&gt;&gt; {rel} &gt;&gt;</span>{' '}
+      <EntityLink name={b} entitySet={entitySet} />
+    </>
+  );
+}
+
+function EntityLink({ name, entitySet }: { name: string; entitySet: Set<string> }) {
+  if (entitySet.has(name)) {
+    return (
+      <Link
+        href={`/mira/wiki/${encodeURIComponent(`wiki-${name}`)}`}
+        style={{ color: '#88c0ff', textDecoration: 'none' }}
+      >
+        {name}
+      </Link>
+    );
+  }
+  return <span style={{ color: '#ccc' }}>{name}</span>;
+}
+
+function extractFacet(tags_json: string | null | undefined): string | null {
+  if (!tags_json) return null;
   try {
-    return JSON.parse(tags_json) as string[];
+    const tags = JSON.parse(tags_json) as string[];
+    const facetTag = tags.find((t) => t.startsWith('facet:'));
+    return facetTag ? facetTag.slice(6) : null;
   } catch {
-    return [];
+    return null;
   }
 }

landing/app/mira/wiki/page.tsx

@@ -41,15 +41,27 @@ export default function WikiIndexPage() {
         const me = (await meRes.json()) as { api_key: string };
         const headers = { Authorization: `Bearer ${me.api_key}` };
 
-        // 用 tag=mira-wiki 一次撈所有相關 blocks（KBDB list endpoint 2026-05-07 加了 tag filter）
+        // 撈所有 type=wiki-page，再 client 端過濾 tags 含 'mira-wiki'
+        // 原本 ?tag=mira-wiki 撞 KBDB worker D1 bug（malformed JSON），改 type filter
+        // 待 KBDB 修 tag filter 後可改回（SDD 待開 kbdb-tag-filter-fix）
         const res = await fetch(
-          `${KBDB_BASE}/blocks?tag=mira-wiki&limit=200`,
+          `${KBDB_BASE}/blocks?type=wiki-page&limit=200`,
           { headers },
         );
         if (!res.ok) throw new Error(`KBDB ${res.status}`);
         const data = await res.json();
         if (cancelled) return;
-        const blocks: Block[] = data.blocks ?? [];
+        const allWikiBlocks: Block[] = data.blocks ?? [];
+        // Client 端過濾：只留 tags 含 'mira-wiki'
+        const blocks: Block[] = allWikiBlocks.filter((b) => {
+          if (!b.tags_json) return false;
+          try {
+            const tags = JSON.parse(b.tags_json) as string[];
+            return tags.includes('mira-wiki');
+          } catch {
+            return false;
+          }
+        });
 
         const tagsOf = (b: Block): string[] => {
           if (!b.tags_json) return [];
@@ -175,8 +187,12 @@ export default function WikiIndexPage() {
                     <WikiCardLink
                       key={p.id}
                       page_name={p.page_name}
-                      title={p.page_name}
-                      excerpt={firstLineOf(p.content)}
+                      title={(p.content || '').trim() || p.page_name}
+                      excerpt={
+                        p.created_at
+                          ? `建立 ${new Date(p.created_at * 1000).toLocaleString('zh-TW')}`
+                          : p.page_name
+                      }
                     />
                   ))}
                 </div>