docs: add WebP image to test Marketplace rendering support (#259)

Add test section with WebP image at end of README to verify VS Code
Marketplace properly renders WebP format before using it for actual
documentation screenshots.
- Bump version to 0.16.12
- Update CHANGELOG.md

🖥️ IDE: [Cursor](https://cursor.sh)
🔌 Extension: [Claude Code](https://claude.ai/download)


Model-Raw: claude-opus-4-5-20251101

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: nullvariant

extensions/git-id-switcher/CHANGELOG.md

@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.16.12] - 2026-02-03
+
+### Documentation
+
+- **Added WebP format test image to README**: Verifies VS Code Marketplace rendering support before using WebP for actual documentation screenshots
+
 ## [0.16.11] - 2026-02-02
 
 ### Changed

extensions/git-id-switcher/README.md

@@ -616,3 +616,11 @@ MIT License - see [LICENSE](https://github.com/nullvariant/nullvariant-vscode-ex
 ## Credits
 
 Created by [Null;Variant](https://github.com/nullvariant)
+
+---
+
+## WebP Support Test
+
+This image tests WebP format support in VS Code Marketplace:
+
+![WebP Test Image](https://assets.nullvariant.com/nullvariant-vscode-extensions/extensions/git-id-switcher/images/slow.webp)

extensions/git-id-switcher/docs/i18n/en/README.md

@@ -612,3 +612,11 @@ MIT License - see [LICENSE](../../../../../LICENSE).
 ## Credits
 
 Created by [Null;Variant](https://github.com/nullvariant)
+
+---
+
+## WebP Support Test
+
+This image tests WebP format support in VS Code Marketplace:
+
+![WebP Test Image](https://assets.nullvariant.com/nullvariant-vscode-extensions/extensions/git-id-switcher/images/slow.webp)

extensions/git-id-switcher/package.json

@@ -2,7 +2,7 @@
   "name": "git-id-switcher",
   "displayName": "%extension.displayName%",
   "description": "%extension.description%",
-  "version": "0.16.11",
+  "version": "0.16.12",
   "publisher": "nullvariant",
   "icon": "images/icon.png",
   "engines": {

extensions/git-id-switcher/src/ui/documentationInternal.ts

@@ -25,15 +25,15 @@ export const DOCUMENT_HASHES: Record<string, string> = {
   'AGENTS.md': '54f16b767e57686b3eb46a2b4aa02b378554cc492c32c49ed96588f6d184b6b8',
   'CODE_OF_CONDUCT.md': 'a5eb286c902437bbe0f6d409894f20e51c172fa869fe2f151bfa388f9d911b54',
   'CONTRIBUTING.md': '4150f8810aec7b2e8eff9f3c69ee1bae1374843f50a812efa6778cba27a833cd',
-  'extensions/git-id-switcher/CHANGELOG.md': '1c8f19034d3141fef9ffccb0b5d7b654ef15af51d45b9079b15e5e8a91e4b7ec',
+  'extensions/git-id-switcher/CHANGELOG.md': '91484a1b69fd8d55d50944cd65f6b649fc2fc73a5e97e571e98442c2ae4aa27a',
   'extensions/git-id-switcher/docs/ARCHITECTURE.md': 'a12dd717f83b28b648972a826701a29fcfd575e351c487f8c421402f80ac3d25',
   'extensions/git-id-switcher/docs/CONTRIBUTING.md': '7d6ad2bc4d8c838790754cb9df848cb65f9fdce7e1a13e5c965b83a3d5b6378c',
   'extensions/git-id-switcher/docs/DESIGN_PHILOSOPHY.md': 'f9718b61ac161cb466dbc76845688e7acacf4e5fdc4b8b9553269dba4a094f6b',
   'extensions/git-id-switcher/docs/i18n/ain/README.md': '4d309165e22a943b2a1791914db02bc2762d5fb643f5350a2426558ac7b3ae19',
   'extensions/git-id-switcher/docs/i18n/bg/README.md': '68ab7f14a808803295a1aa170ebc4289d11334c459db8826e73d6d00efa4789c',
   'extensions/git-id-switcher/docs/i18n/cs/README.md': '454f516760d76709a8177c04ae4e45af12cd01ed79495a67c6f35da3ffc5ff34',
   'extensions/git-id-switcher/docs/i18n/de/README.md': '57af6fc860928c632225fa3bc4fde411526eb8ce2d73787516e126735e9c5495',
-  'extensions/git-id-switcher/docs/i18n/en/README.md': '90e0a4b9a72c16c8ce68a64760ec828ef6f13978035458068f64a987dcbd9355',
+  'extensions/git-id-switcher/docs/i18n/en/README.md': 'bb97973bdbeca563ec600c861fd9c79f8a320cc4cbd8e63987b437ed78dfc4a5',
   'extensions/git-id-switcher/docs/i18n/eo/README.md': 'd84f392cbb8456689d455d8967acf16dbc8e0898f16342d1a3b7f387e1662bd0',
   'extensions/git-id-switcher/docs/i18n/es/README.md': '8741a97eabb93a616d7172b734e0d8954654f71ed862942443fbb4afa85e1e9f',
   'extensions/git-id-switcher/docs/i18n/fr/README.md': 'eb1002b016ca78b86a7239e593ad7f4784b0bcba91362dd6b14fbe2c22571bb0',
@@ -57,7 +57,7 @@ export const DOCUMENT_HASHES: Record<string, string> = {
   'extensions/git-id-switcher/docs/i18n/zh-TW/README.md': '5b6abf9f58aea42d4dab5d05fc484be45be1ee47ba7e1b59ab7cd86043902390',
   'extensions/git-id-switcher/docs/LANGUAGES.md': 'da50222843094479fd826837038dd62d619ecbc87d67f0b2c299973587abe8e9',
   'extensions/git-id-switcher/LICENSE': 'e2383295422577622666fa2ff00e5f03abd8f2772d74cca5d5443020ab23d03d',
-  'extensions/git-id-switcher/README.md': 'cc8dc766afdd43c1fb9051b5270617382c845ebabd103654f190ce63850e3c6e',
+  'extensions/git-id-switcher/README.md': '79f0630f76511839ee47f698e3bd5af6041ad8a07acd043f98bcf9a890b48451',
   'LICENSE': 'e2383295422577622666fa2ff00e5f03abd8f2772d74cca5d5443020ab23d03d',
   'README.md': 'e6c0c4e5924873eabd0e49973e29457abc5e8171ba4ff9da77700e6a19c28f9d',
   'SECURITY.md': '87496fc22c667ebc9911a27ef520d1e2918229f7c44bb0f717151995dfd4893b',