fix: gate snapshot and release jobs to their intended triggers

snapshot runs only on workflow_dispatch, release runs only on push to
main. Previously both jobs ran on every trigger. Also reverts
inputs.extension condition since snapshot is now workflow_dispatch-only.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ryanbas21

.github/workflows/release.yml

@@ -13,6 +13,7 @@ concurrency: ${{ github.workflow }}-${{ github.ref }}
 
 jobs:
   snapshot:
+    if: github.event_name == 'workflow_dispatch'
     runs-on: ubuntu-latest
     permissions:
       contents: read
@@ -44,12 +45,12 @@ jobs:
           NPM_CONFIG_PROVENANCE: true
 
       - name: Zip extension
-        if: inputs.extension != false
+        if: inputs.extension
         working-directory: packages/devtools-extension
         run: cd dist && zip -r ../extension.zip .
 
       - name: Publish extension to testers
-        if: inputs.extension != false
+        if: inputs.extension
         uses: mnao305/chrome-extension-upload@v5.0.0
         with:
           file-path: packages/devtools-extension/extension.zip
@@ -60,6 +61,7 @@ jobs:
           publish: true
           publish-target: trustedTesters
   release:
+    if: github.event_name == 'push'
     runs-on: ubuntu-latest
     permissions:
       contents: write