[WIP] Add Vercel Speed Insights integration for performance monitoring

[Copilot]

Thanks for the feedback on #3. I've created this new PR, which merges into #3, to address your comment. I will work on the changes and keep this PR's description up to date as I make progress.

Original PR: #3
Triggering comment (#3 (comment)):

@copilot
vite v6.4.1 building for production...
transforming...
✓ 1753 modules transformed.
rendering chunks...
computing gzip size...
dist/index.html 2.77 kB │ gzip: 1.19 kB
dist/assets/index-WlLBOGdf.css 32.31 kB │ gzip: 7.33 kB
dist/assets/index-NK1jlE8x.js 468.08 kB │ gzip: 131.80 kB
✓ built in 2.85s
Detected pnpm-lock.yaml 9 which may be generated by pnpm@9.x or pnpm@10.x
Using pnpm@10.x based on project creation date
To use pnpm@9.x, manually opt in using corepack (https://vercel.com/docs/deployments/configure-a-build#corepack)
Installing dependencies...
 ERR_PNPM_OUTDATED_LOCKFILE  Cannot install with "frozen-lockfile" because pnpm-lock.yaml is not up to date with /package.json
Note that in CI environments this setting is true by default. If you still need to run install in such cases, use "pnpm install --no-frozen-lockfile"
Failure reason:
specifiers in the lockfile don't match specifiers in package.json:

• 1 dependencies were added: @vercel/speed-insights@^1.3.1
  Error: Command "pnpm install" exited with 1

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Project	Deployment	Actions	Updated (UTC)
gifts-couple-connection	Canceled		Feb 12, 2026 10:36am