diff --git a/src/main/ai/AiWorker.ts b/src/main/ai/AiWorker.ts
index f7469ad..17e9206 100644
--- a/src/main/ai/AiWorker.ts
+++ b/src/main/ai/AiWorker.ts
@@ -6,6 +6,9 @@ import { parseAllCandidates } from '../services/dueDateParser.js';
 import { ZodError } from 'zod';
 import { kstTodayAsDate, kstTodayIso } from '../../shared/util/kstDate.js';
 
+// v0.2.6 #29 — backlog 의 top-N 튜닝은 dogfood telemetry 후 (현재 magic 만 추출).
+const VOCAB_TOP_N = 20;
+
 function classifyReason(err: unknown): AiFailedReason {
   if (err instanceof ZodError) return 'schema';
   const msg = err instanceof Error ? err.message.toLowerCase() : String(err).toLowerCase();
@@ -124,7 +127,7 @@ export class AiWorker {
         const todayDate = kstTodayAsDate(nowDate);
         const todayIso = kstTodayIso(nowDate);
         const candidates = parseAllCandidates(note.rawText, todayDate);
-        const vocab = this.repo.getTopUsedTags(20);
+        const vocab = this.repo.getTopUsedTags(VOCAB_TOP_N);
         const res = await this.holder.get().generate({
           text: note.rawText,
           todayKst: todayIso,
diff --git a/src/main/ipc/inboxApi.ts b/src/main/ipc/inboxApi.ts
index 97a9819..16d1b81 100644
--- a/src/main/ipc/inboxApi.ts
+++ b/src/main/ipc/inboxApi.ts
@@ -39,7 +39,7 @@ export function registerInboxApi(deps: InboxIpcDeps): void {
     deps.repo.setDueDate(arg.noteId, arg.date);
   });
 
-  ipcMain.handle('inbox:delete', async (_e, noteId: string) => {
+  ipcMain.handle('inbox:trash', async (_e, noteId: string) => {
     await deps.capture.deleteNote(noteId);
   });
 
diff --git a/src/main/services/telemetryStats.ts b/src/main/services/telemetryStats.ts
index 5222797..8c99cc3 100644
--- a/src/main/services/telemetryStats.ts
+++ b/src/main/services/telemetryStats.ts
@@ -139,6 +139,8 @@ export function aggregateStats(events: TelemetryEvent[], generatedAt: Date): Sta
   const aiTotal = aiSucceeded + aiFailed;
   const successRate = aiTotal === 0 ? 'N/A' : `${(aiSucceeded / aiTotal * 100).toFixed(1)}% (${aiSucceeded}/${aiTotal})`;
   const avgDuration = durationN === 0 ? 'N/A' : `${Math.round(durationSum / durationN)}`;
+  // v0.2.6 #9 — 회수율 = restore / trash event 비율 (event-level — 한 노트 trash-restore 반복 시
+  // 100% 가능, unique-note 회수율 아님. spec §6.2 "회수 도구 동작?" 질문에 충분).
   const trashRecoveryRate = trashCount === 0
     ? 'N/A'
     : `${(restoreCount / trashCount * 100).toFixed(1)}% (${restoreCount}/${trashCount})`;
diff --git a/src/preload/index.ts b/src/preload/index.ts
index 1ba817c..4281f5a 100644
--- a/src/preload/index.ts
+++ b/src/preload/index.ts
@@ -12,7 +12,7 @@ const api: InklingApi = {
     updateAiFields: (noteId, fields) =>
       ipcRenderer.invoke('inbox:updateAi', { noteId, fields }),
     setDueDate: (noteId, date) => ipcRenderer.invoke('inbox:setDueDate', { noteId, date }),
-    deleteNote: (noteId) => ipcRenderer.invoke('inbox:delete', noteId),
+    deleteNote: (noteId) => ipcRenderer.invoke('inbox:trash', noteId),
     setIntent: (noteId, text) => ipcRenderer.invoke('inbox:setIntent', { noteId, text }),
     dismissIntent: (noteId) => ipcRenderer.invoke('inbox:dismissIntent', noteId),
     getContinuity: () => ipcRenderer.invoke('inbox:continuity'),
diff --git a/src/renderer/inbox/components/OllamaSettingsModal.tsx b/src/renderer/inbox/components/OllamaSettingsModal.tsx
index 5eadc22..8400e59 100644
--- a/src/renderer/inbox/components/OllamaSettingsModal.tsx
+++ b/src/renderer/inbox/components/OllamaSettingsModal.tsx
@@ -1,7 +1,10 @@
 import React, { useEffect, useState } from 'react';
+import { z } from 'zod';
 import { inboxApi } from '../api.js';
 import { DEFAULT_OLLAMA_ENDPOINT, DEFAULT_OLLAMA_MODEL } from '../../../shared/constants.js';
 
+const EndpointSchema = z.string().url();
+
 interface Props {
   open: boolean;
   onClose: () => void;
@@ -32,6 +35,16 @@ export function OllamaSettingsModal({ open, onClose }: Props): React.ReactElemen
     setSaving(true);
     setError(null);
     try {
+      // v0.2.6 #42 — client-side URL validation, server-side healthCheck 전에 명확한 메시지
+      const parseResult = EndpointSchema.safeParse(endpoint);
+      if (!parseResult.success) {
+        setError('유효한 URL 형식이 아닙니다 (예: http://localhost:11434)');
+        return;
+      }
+      if (model.trim().length === 0) {
+        setError('모델명을 입력하세요');
+        return;
+      }
       const r = await inboxApi.saveOllamaSettings({ endpoint, model });
       if (r.ok) {
         onClose();