Add file icons for Protobuf and Buf configuration files (#452)

This PR adds file icons for protobuf files and buf
configuration files through the VS Code extension.

The VS Code extension will use the icons provided
by the languages configuration if the underlying icon
theme does not provide icons for the given language
IDs, so buf files use the `buf` language ID.

Fixes #396

<img width="273" height="779" alt="Screenshot 2025-09-10 at 10 30 07"
src="https://github.com/user-attachments/assets/c38a1c8f-ad02-417a-a30f-fb630652e62f"
/>
<img width="261" height="789" alt="Screenshot 2025-09-10 at 10 29 54"
src="https://github.com/user-attachments/assets/5ec309bf-e3c7-4f32-857f-796bc2cae5ff"
/>

Author: doriable

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 ## Unreleased
 
-- No changes yet.
+- Add file icons for Protobuf and Buf configuration files.
 
 ## 0.8.1
 

icons/_buf_file.svg

@@ -244,13 +244,18 @@
     ],
     "languages": [
       {
-        "id": "yaml",
+        "id": "buf",
         "filenames": [
+          "buf.yaml",
+          "buf.gen.yaml",
           "buf.lock",
           "buf.mod",
-          "buf.work",
-          "buf.gen"
-        ]
+          "buf.work"
+        ],
+        "icon": {
+          "light": "./icons/_buf_file.svg",
+          "dark": "./icons/_buf_file.svg"
+        }
       },
       {
         "id": "proto",
@@ -261,7 +266,11 @@
           "Protocol Buffers",
           "Protobuf"
         ],
-        "configuration": "./protobuf-language-configuration.json"
+        "configuration": "./protobuf-language-configuration.json",
+        "icon": {
+          "light": "./icons/_proto_file_light_mode.svg",
+          "dark": "./icons/_proto_file_dark_mode.svg"
+        }
       },
       {
         "//": "This is a special language used by the 'declaration' part of hover inlays in Markdown.",