Add auto-collapse option for large file lists in PR comments

.gitignore

@@ -14,3 +14,6 @@ node_modules
 # dotenv environment variables file
 .env
 .env.test
+
+# npm lock file (project uses pnpm)
+package-lock.json

README.md

@@ -322,6 +322,19 @@ To use a custom pattern for a specific build tool:
 strip-hash: '\.([0-9a-f]{8})\.'
 ```
 
+### auto-collapse
+Default: `true`
+
+Possible values: `true`, `false`
+
+When `true`, file rows are automatically collapsed into a `<details>` section when there are more than 20 files. The **Total** and **Tarball size** rows are always shown outside the collapsible section.
+
+To disable auto-collapsing:
+
+```yml
+auto-collapse: false
+```
+
 ## 💁‍♀️ FAQ
 
 ### Can I use this for non-published projects?

action.yml

@@ -25,6 +25,9 @@ inputs:
     description: 'Minimum byte difference to consider a file as changed (default: 100)'
   strip-hash:
     description: 'Regular expression to strip hashes from file names for comparison. Files that differ only in their hash will be compared as the same file. Set to "false" to disable. Default matches common build tool hash patterns.'
+  auto-collapse:
+    description: 'Automatically collapse file rows into a <details> section when there are more than 20 files: true, false'
+    default: 'true'
 runs:
   using: 'node20'
   main: 'dist/index.js'