Remove git dependency from Docker build via yarn resolution (#961)

Docker browser build fails because `@electron/rebuild` requires
`@electron/node-gyp` from a GitHub URL, which needs git to clone. The
package exists on npm registry but yarn.lock referenced the git URL.

## Changes

- **Added yarn resolution** to force
`@electron/node-gyp@10.2.0-electron.1` from npm registry instead of
GitHub
- **Removed git installation** from Dockerfile.browser builder stage
- **Updated yarn.lock** to resolve dependency from
`registry.yarnpkg.com` instead of `github.com`

```diff
// package.json
+ "resolutions": {
+   "@electron/node-gyp": "10.2.0-electron.1"
+ }
```

```diff
// Dockerfile.browser
- RUN apk add --no-cache git
```

This eliminates the git dependency entirely while preserving the exact
same package version.

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<details>

<summary>Original prompt</summary>

> build still fails
https://github.com/thomasnordquist/MQTT-Explorer/actions/runs/20443384267/job/58741359390


</details>



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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: thomasnordquist <7721625+thomasnordquist@users.noreply.github.com>

Dockerfile.browser

@@ -4,9 +4,6 @@ FROM node:24-alpine AS builder
 
 WORKDIR /build
 
-# Install git (required for git-based dependencies like @electron/node-gyp)
-RUN apk add --no-cache git
-
 # Copy package files for dependency installation
 COPY package.json yarn.lock ./
 COPY app/package.json ./app/

package.json

@@ -46,6 +46,9 @@
     "type": "git",
     "url": "https://github.com/thomasnordquist/MQTT-Explorer.git"
   },
+  "resolutions": {
+    "@electron/node-gyp": "10.2.0-electron.1"
+  },
   "build": {
     "appId": "mqtt-explorer",
     "productName": "MQTT Explorer",

yarn.lock

@@ -667,9 +667,10 @@
   optionalDependencies:
     global-agent "^3.0.0"
 
-"@electron/node-gyp@https://github.com/electron/node-gyp#06b29aafb7708acef8b3669835c8a7857ebc92d2":
+"@electron/node-gyp@10.2.0-electron.1", "@electron/node-gyp@https://github.com/electron/node-gyp#06b29aafb7708acef8b3669835c8a7857ebc92d2":
   version "10.2.0-electron.1"
-  resolved "https://github.com/electron/node-gyp#06b29aafb7708acef8b3669835c8a7857ebc92d2"
+  resolved "https://registry.yarnpkg.com/@electron/node-gyp/-/node-gyp-10.2.0-electron.1.tgz#ca5f125dcd0ffb275797c0c418c0d64005e0f815"
+  integrity sha512-YdpRE6qSNYyf7gBv1LBDc8OAs8f/mZthzM1k4pFzodNq8dBGf64MWC5Bq8VVlgdafjQXLpINHvtRAUC9uinoqw==
   dependencies:
     env-paths "^2.2.0"
     exponential-backoff "^3.1.1"