Add L0 index and anchor UI updates

modules/story-summary/vector/storage/state-store.js

@@ -35,6 +35,58 @@ function ensureStateAtomsArray() {
     return chat_metadata.extensions[EXT_ID].stateAtoms;
 }
 
+// L0Index: per-floor status (ok | empty | fail)
+function ensureL0Index() {
+    chat_metadata.extensions ||= {};
+    chat_metadata.extensions[EXT_ID] ||= {};
+    chat_metadata.extensions[EXT_ID].l0Index ||= { version: 1, byFloor: {} };
+    chat_metadata.extensions[EXT_ID].l0Index.byFloor ||= {};
+    return chat_metadata.extensions[EXT_ID].l0Index;
+}
+
+export function getL0Index() {
+    return ensureL0Index();
+}
+
+export function getL0FloorStatus(floor) {
+    const idx = ensureL0Index();
+    return idx.byFloor?.[String(floor)] || null;
+}
+
+export function setL0FloorStatus(floor, record) {
+    const idx = ensureL0Index();
+    idx.byFloor[String(floor)] = {
+        ...record,
+        floor,
+        updatedAt: Date.now(),
+    };
+    saveMetadataDebounced();
+}
+
+export function clearL0Index() {
+    const idx = ensureL0Index();
+    idx.byFloor = {};
+    saveMetadataDebounced();
+}
+
+export function deleteL0IndexFromFloor(fromFloor) {
+    const idx = ensureL0Index();
+    const keys = Object.keys(idx.byFloor || {});
+    let deleted = 0;
+    for (const k of keys) {
+        const f = Number(k);
+        if (Number.isFinite(f) && f >= fromFloor) {
+            delete idx.byFloor[k];
+            deleted++;
+        }
+    }
+    if (deleted > 0) {
+        saveMetadataDebounced();
+        xbLog.info(MODULE_ID, `删除 ${deleted} 条 L0Index (floor >= ${fromFloor})`);
+    }
+    return deleted;
+}
+
 /**
  * 获取当前聊天的所有 StateAtoms
  */
@@ -113,6 +165,30 @@ export function getStateAtomsCount() {
     return ensureStateAtomsArray().length;
 }
 
+/**
+ * Return floors that already have extracted atoms.
+ */
+export function getExtractedFloors() {
+    const floors = new Set();
+    const arr = ensureStateAtomsArray();
+    for (const atom of arr) {
+        if (typeof atom?.floor === 'number' && atom.floor >= 0) {
+            floors.add(atom.floor);
+        }
+    }
+    return floors;
+}
+
+/**
+ * Replace all stored StateAtoms.
+ */
+export function replaceStateAtoms(atoms) {
+    const next = Array.isArray(atoms) ? atoms : [];
+    chat_metadata.extensions[EXT_ID].stateAtoms = next;
+    saveMetadataDebounced();
+    xbLog.info(MODULE_ID, `替换 StateAtoms: ${next.length} 条`);
+}
+
 // ═══════════════════════════════════════════════════════════════════════════
 // StateVector 操作（IndexedDB）
 // ═══════════════════════════════════════════════════════════════════════════