fix(devbar): keep inline release badges content-sized

[ytspar]

Summary

• keep inline-only custom controls such as release badges out of the grouped custom-controls responsive layout mode
• bump @ytspar/devbar to 1.15.2 and add release notes
• add regression coverage for inline vs grouped custom-control layout markers

Verification

• corepack pnpm@9.15.9 exec biome check packages/devbar/src/modules/rendering/expanded.ts packages/devbar/src/modules/rendering/expanded.test.ts packages/devbar/package.json packages/playground/src/release-notes.json
• corepack pnpm@9.15.9 exec vitest run packages/devbar/src/modules/rendering/expanded.test.ts packages/devbar/src/constants.test.ts
• corepack pnpm@9.15.9 --filter @ytspar/devbar build
• corepack pnpm@9.15.9 --filter @ytspar/devbar publish --dry-run --no-git-checks

Publish note

The production release workflow reached npm publish for 1.15.2 but npm rejected it with EOTP because the package requires a one-time authenticator code.