diff --git a/src/renderer/src/hooks/useSettings.ts b/src/renderer/src/hooks/useSettings.ts
index 5eea046d0..66d9615ee 100644
--- a/src/renderer/src/hooks/useSettings.ts
+++ b/src/renderer/src/hooks/useSettings.ts
@@ -6,13 +6,13 @@ import {
   setAutoCheckUpdate as _setAutoCheckUpdate,
   setLaunchOnBoot,
   setLaunchToTray,
+  setPinTopicsToTop,
   setSendMessageShortcut as _setSendMessageShortcut,
   setSidebarIcons,
   setTargetLanguage,
   setTheme,
   SettingsState,
   setTopicPosition,
-  setPinTopicsToTop,
   setTray as _setTray,
   setTrayOnClose,
   setWindowStyle
diff --git a/src/renderer/src/pages/knowledge/components/KnowledgeSettings.tsx b/src/renderer/src/pages/knowledge/components/KnowledgeSettings.tsx
index 2f224eddc..a7437bef6 100644
--- a/src/renderer/src/pages/knowledge/components/KnowledgeSettings.tsx
+++ b/src/renderer/src/pages/knowledge/components/KnowledgeSettings.tsx
@@ -262,18 +262,6 @@ const PopupContainer: React.FC<Props> = ({ base: _base, resolve }) => {
             />
           </SettingsItem>
 
-          <SettingsItem>
-            <div className="settings-label">{t('knowledge.topN')}</div>
-            <InputNumber
-              style={{ width: '100%' }}
-              min={0}
-              max={10}
-              value={base.topN}
-              placeholder={t('knowledge.topN_placeholder')}
-              onChange={(value) => setNewBase({ ...newBase, topN: value || undefined })}
-            />
-          </SettingsItem>
-
           <Alert
             message={t('knowledge.chunk_size_change_warning')}
             type="warning"
diff --git a/src/renderer/src/pages/paintings/Artboard.tsx b/src/renderer/src/pages/paintings/Artboard.tsx
index e5666801b..fffd52b00 100644
--- a/src/renderer/src/pages/paintings/Artboard.tsx
+++ b/src/renderer/src/pages/paintings/Artboard.tsx
@@ -109,11 +109,11 @@ const Artboard: FC<ArtboardProps> = ({
                   </Button>
                 </div>
               </div>
+            ) : imageCover ? (
+              imageCover
             ) : (
-                imageCover ?
-                  imageCover:
-                  (<div>{t('paintings.image_placeholder')}</div>)
-              )}
+              <div>{t('paintings.image_placeholder')}</div>
+            )}
           </ImagePlaceholder>
         )}
         {isLoading && (
diff --git a/yarn.lock b/yarn.lock
index 79fe95e4a..8e731bfad 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -700,6 +700,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@cherrystudio/mac-system-ocr@npm:^0.2.2":
+  version: 0.2.2
+  resolution: "@cherrystudio/mac-system-ocr@npm:0.2.2"
+  dependencies:
+    bindings: "npm:^1.5.0"
+    node-api-headers: "npm:^1.0.1"
+    node-gyp: "npm:latest"
+  conditions: os=darwin
+  languageName: node
+  linkType: hard
+
 "@chevrotain/cst-dts-gen@npm:11.0.3":
   version: 11.0.3
   resolution: "@chevrotain/cst-dts-gen@npm:11.0.3"
@@ -3397,6 +3408,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@mistralai/mistralai@npm:^1.6.0":
+  version: 1.6.1
+  resolution: "@mistralai/mistralai@npm:1.6.1"
+  dependencies:
+    zod-to-json-schema: "npm:^3.24.1"
+  peerDependencies:
+    zod: ">= 3"
+  checksum: 10c0/3e9adc13fc3d19cd6961e2f325a2fe358dca8b43e2e6aa5a3a4ae88baf799f4b33835bb84d36b941629861bfc098cc8717898d19a5409826304ba61ae287d69c
+  languageName: node
+  linkType: hard
+
 "@mixmark-io/domino@npm:^2.2.0":
   version: 2.2.0
   resolution: "@mixmark-io/domino@npm:2.2.0"
@@ -5932,6 +5954,7 @@ __metadata:
     "@cherrystudio/embedjs-loader-web": "npm:^0.1.31"
     "@cherrystudio/embedjs-loader-xml": "npm:^0.1.31"
     "@cherrystudio/embedjs-openai": "npm:^0.1.31"
+    "@cherrystudio/mac-system-ocr": "npm:^0.2.2"
     "@electron-toolkit/eslint-config-prettier": "npm:^3.0.0"
     "@electron-toolkit/eslint-config-ts": "npm:^3.0.0"
     "@electron-toolkit/preload": "npm:^3.0.0"
@@ -5945,6 +5968,7 @@ __metadata:
     "@hello-pangea/dnd": "npm:^16.6.0"
     "@kangfenmao/keyv-storage": "npm:^0.1.0"
     "@langchain/community": "npm:^0.3.36"
+    "@mistralai/mistralai": "npm:^1.6.0"
     "@modelcontextprotocol/sdk": "npm:^1.11.4"
     "@mozilla/readability": "npm:^0.6.0"
     "@notionhq/client": "npm:^2.2.15"
@@ -6032,6 +6056,8 @@ __metadata:
     openai: "patch:openai@npm%3A4.96.0#~/.yarn/patches/openai-npm-4.96.0-0665b05cb9.patch"
     os-proxy-config: "npm:^1.1.2"
     p-queue: "npm:^8.1.0"
+    pdf-to-img: "npm:^4.4.0"
+    pdfjs-dist: "npm:4.2.67"
     playwright: "npm:^1.52.0"
     prettier: "npm:^3.5.3"
     proxy-agent: "npm:^6.5.0"
@@ -6738,6 +6764,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"bindings@npm:^1.5.0":
+  version: 1.5.0
+  resolution: "bindings@npm:1.5.0"
+  dependencies:
+    file-uri-to-path: "npm:1.0.0"
+  checksum: 10c0/3dab2491b4bb24124252a91e656803eac24292473e56554e35bbfe3cc1875332cfa77600c3bac7564049dc95075bf6fcc63a4609920ff2d64d0fe405fcf0d4ba
+  languageName: node
+  linkType: hard
+
 "birecord@npm:^0.1.1":
   version: 0.1.1
   resolution: "birecord@npm:0.1.1"
@@ -8681,6 +8716,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"detect-libc@npm:^2.0.0":
+  version: 2.0.4
+  resolution: "detect-libc@npm:2.0.4"
+  checksum: 10c0/c15541f836eba4b1f521e4eecc28eefefdbc10a94d3b8cb4c507689f332cc111babb95deda66f2de050b22122113189986d5190be97d51b5a2b23b938415e67c
+  languageName: node
+  linkType: hard
+
 "detect-libc@npm:^2.0.1":
   version: 2.0.3
   resolution: "detect-libc@npm:2.0.3"
@@ -10349,6 +10391,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"file-uri-to-path@npm:1.0.0":
+  version: 1.0.0
+  resolution: "file-uri-to-path@npm:1.0.0"
+  checksum: 10c0/3b545e3a341d322d368e880e1c204ef55f1d45cdea65f7efc6c6ce9e0c4d22d802d5629320eb779d006fe59624ac17b0e848d83cc5af7cd101f206cb704f5519
+  languageName: node
+  linkType: hard
+
 "file-url@npm:^2.0.0":
   version: 2.0.2
   resolution: "file-url@npm:2.0.2"
@@ -14625,6 +14674,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"napi-build-utils@npm:^2.0.0":
+  version: 2.0.0
+  resolution: "napi-build-utils@npm:2.0.0"
+  checksum: 10c0/5833aaeb5cc5c173da47a102efa4680a95842c13e0d9cc70428bd3ee8d96bb2172f8860d2811799b5daa5cbeda779933601492a2028a6a5351c6d0fcf6de83db
+  languageName: node
+  linkType: hard
+
 "natural-compare@npm:^1.4.0":
   version: 1.4.0
   resolution: "natural-compare@npm:1.4.0"
@@ -14669,6 +14725,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"node-abi@npm:^3.3.0":
+  version: 3.75.0
+  resolution: "node-abi@npm:3.75.0"
+  dependencies:
+    semver: "npm:^7.3.5"
+  checksum: 10c0/c43a2409407df3737848fd96202b0a49e15039994aecce963969e9ef7342a8fc544aba94e0bfd8155fb9de5f5fe9a4b6ccad8bf509e7c46caf096fc4491d63f2
+  languageName: node
+  linkType: hard
+
 "node-abi@npm:^3.45.0":
   version: 3.74.0
   resolution: "node-abi@npm:3.74.0"
@@ -15552,6 +15617,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"path2d@npm:^0.2.0":
+  version: 0.2.2
+  resolution: "path2d@npm:0.2.2"
+  checksum: 10c0/1bb76c7f275d07f1bc7ca12171d828e91bf8a12596f0765a52e9d4d47fe1a428455dc1dd4c9002924a9bc554f6ac25e09a6c22eaecf32e5e33fba2985b5168f8
+  languageName: node
+  linkType: hard
+
 "pathe@npm:^2.0.1, pathe@npm:^2.0.3":
   version: 2.0.3
   resolution: "pathe@npm:2.0.3"
@@ -15926,6 +15998,28 @@ __metadata:
   languageName: node
   linkType: hard
 
+"prebuild-install@npm:^7.1.1":
+  version: 7.1.3
+  resolution: "prebuild-install@npm:7.1.3"
+  dependencies:
+    detect-libc: "npm:^2.0.0"
+    expand-template: "npm:^2.0.3"
+    github-from-package: "npm:0.0.0"
+    minimist: "npm:^1.2.3"
+    mkdirp-classic: "npm:^0.5.3"
+    napi-build-utils: "npm:^2.0.0"
+    node-abi: "npm:^3.3.0"
+    pump: "npm:^3.0.0"
+    rc: "npm:^1.2.7"
+    simple-get: "npm:^4.0.0"
+    tar-fs: "npm:^2.0.0"
+    tunnel-agent: "npm:^0.6.0"
+  bin:
+    prebuild-install: bin.js
+  checksum: 10c0/25919a42b52734606a4036ab492d37cfe8b601273d8dfb1fa3c84e141a0a475e7bad3ab848c741d2f810cef892fcf6059b8c7fe5b29f98d30e0c29ad009bedff
+  languageName: node
+  linkType: hard
+
 "prelude-ls@npm:^1.2.1":
   version: 1.2.1
   resolution: "prelude-ls@npm:1.2.1"
@@ -17990,6 +18084,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"simple-get@npm:^4.0.0":
+  version: 4.0.1
+  resolution: "simple-get@npm:4.0.1"
+  dependencies:
+    decompress-response: "npm:^6.0.0"
+    once: "npm:^1.3.1"
+    simple-concat: "npm:^1.0.0"
+  checksum: 10c0/b0649a581dbca741babb960423248899203165769747142033479a7dc5e77d7b0fced0253c731cd57cf21e31e4d77c9157c3069f4448d558ebc96cf9e1eebcf0
+  languageName: node
+  linkType: hard
+
 "simple-update-notifier@npm:2.0.0":
   version: 2.0.0
   resolution: "simple-update-notifier@npm:2.0.0"