ci: Fix formatting inconsistency between save and lint execution

VS Code Extension used bundled Prettier while CLI used global Prettier, causing formatting differences due to version mismatch.
Added local prettier as devDependency to ensure all tools use the same version (3.6.2).

Author: KubrickCode

.devcontainer/post-create.sh

@@ -1,7 +1,6 @@
 #!/bin/bash
 
 npm install -g @anthropic-ai/claude-code
-npm install -g prettier
 npm install -g baedal
 npm install -g @vscode/vsce
 npm install -g ovsx

.github/workflows/lint.yml

@@ -39,13 +39,12 @@ jobs:
         with:
           node-version: "22.18.0"
 
-      - name: Install Prettier globally
-        run: npm install -g prettier
-
       - uses: extractions/setup-just@v3
 
       - name: Install dependencies
-        run: just deps-extension
+        run: |
+          just deps-root
+          just deps-extension
 
       - name: Lint Extension
         run: just lint extension
@@ -62,13 +61,12 @@ jobs:
         with:
           node-version: "22.18.0"
 
-      - name: Install Prettier globally
-        run: npm install -g prettier
-
       - uses: extractions/setup-just@v3
 
       - name: Install dependencies
-        run: just deps-web-view
+        run: |
+          just deps-root
+          just deps-web-view
 
       - name: Lint Web View
         run: just lint web-view
@@ -85,10 +83,10 @@ jobs:
         with:
           node-version: "22.18.0"
 
-      - name: Install Prettier globally
-        run: npm install -g prettier
-
       - uses: extractions/setup-just@v3
 
+      - name: Install dependencies
+        run: just deps-root
+
       - name: Lint Config Files
         run: just lint config

justfile

@@ -34,17 +34,17 @@ lint target="all":
         just lint justfile
         ;;
       extension)
-        prettier --write "{{ extension_dir }}/src/**/*.ts"
+        npx prettier --write "{{ extension_dir }}/src/**/*.ts"
         cd "{{ extension_dir }}"
         yarn lint
         ;;
       web-view)
-        prettier --write "{{ web_view_dir }}/src/**/*.{ts,tsx}"
+        npx prettier --write "{{ web_view_dir }}/src/**/*.{ts,tsx}"
         cd "{{ web_view_dir }}"
         yarn lint
         ;;
       config)
-        prettier --write "**/*.{json,yml,yaml,md}"
+        npx prettier --write "**/*.{json,yml,yaml,md}"
         ;;
       justfile)
         just --fmt --unstable

package.json

@@ -270,7 +270,7 @@
   },
   "devDependencies": {
     "@vscode/vsce": "3.6.2",
-    "ovsx": "0.10.6"
-  },
-  "dependencies": {}
+    "ovsx": "0.10.6",
+    "prettier": "3.6.2"
+  }
 }