fix: switch macOS CI runners to macos-15

macos-14 runner image update (20260317.0174) broke CGo/systray builds
due to CommandLineTools SDK incompatibility. Switch to macos-15 which
has a working default Xcode/SDK configuration.

Author: prakersh

.github/workflows/ci.yml

@@ -41,7 +41,7 @@ jobs:
         run: go build -o onwatch .
 
   menubar-macos:
-    runs-on: macos-latest
+    runs-on: macos-15
     name: Menubar macOS
 
     steps:
@@ -52,11 +52,6 @@ jobs:
         with:
           go-version-file: go.mod
 
-      - name: Select Xcode and SDK
-        run: |
-          sudo xcode-select -s /Applications/Xcode_16.2.app/Contents/Developer
-          echo "SDKROOT=$(xcrun --sdk macosx --show-sdk-path)" >> "$GITHUB_ENV"
-
       - name: Compile tagged menubar packages
         run: |
           go test -tags menubar ./internal/menubar ./internal/web

.github/workflows/release.yml

@@ -83,7 +83,7 @@ jobs:
 
   build-macos-amd64:
     needs: test
-    runs-on: macos-14
+    runs-on: macos-15
     name: Build macOS amd64
 
     steps:
@@ -100,11 +100,6 @@ jobs:
         id: version
         run: echo "version=$(cat VERSION)" >> "$GITHUB_OUTPUT"
 
-      - name: Select Xcode and SDK
-        run: |
-          sudo xcode-select -s /Applications/Xcode_16.2.app/Contents/Developer
-          echo "SDKROOT=$(xcrun --sdk macosx --show-sdk-path)" >> "$GITHUB_ENV"
-
       - name: Build macOS artifact
         run: |
           CGO_ENABLED=1 GOOS=darwin GOARCH=amd64 go build \
@@ -120,7 +115,7 @@ jobs:
 
   build-macos-arm64:
     needs: test
-    runs-on: macos-14
+    runs-on: macos-15
     name: Build macOS arm64
 
     steps:
@@ -137,11 +132,6 @@ jobs:
         id: version
         run: echo "version=$(cat VERSION)" >> "$GITHUB_OUTPUT"
 
-      - name: Select Xcode and SDK
-        run: |
-          sudo xcode-select -s /Applications/Xcode_16.2.app/Contents/Developer
-          echo "SDKROOT=$(xcrun --sdk macosx --show-sdk-path)" >> "$GITHUB_ENV"
-
       - name: Build macOS artifact
         run: |
           CGO_ENABLED=1 GOOS=darwin GOARCH=arm64 go build \