feat(i18n): add Slovenian (sl) to SUPPORTED_LOCALES (#29999)

[Rodrigoue9]

Title

feat(i18n): add Slovenian (sl, sl-SI) to SUPPORTED_LOCALES (#29999)

Description

• Adds sl and sl-SI to SUPPORTED_LOCALES in packages/platform/constants/api.ts.
• Enables Slovenian language support and recognition across API endpoints and localization settings.

Closes #29999

[github-actions]

Welcome to Cal.diy, @Rodrigoue9! Thanks for opening this pull request.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 2bc7a48a-57dc-4e6c-8237-f3254311160a

📥 Commits

Reviewing files that changed from the base of the PR and between 2b75ee0 and 385f3b6.

📒 Files selected for processing (4)

• apps/api/v2/src/lib/enums/locales.ts
• i18n.json
• packages/dayjs/locales.ts
• packages/i18n/locales/sl/common.json

Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review.

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📝 Walkthrough

Walkthrough

Added Slovenian support by defining Locales.SL as "sl", adding sl to the locale targets, and importing dayjs/locale/sl in the Day.js locale aggregation module.

Merge Risk: ⚪ Minimal · up to 385f3

This change adds Slovenian localization support without any identified merge-blocking risk; it is merge-ready after normal checks and review.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The PR adds locale registration only; it omits the required translation file, SUPPORTED_LOCALES updates, selection, and browser detection [#29999].	Add sl and sl-SI to SUPPORTED_LOCALES, add apps/web/public/static/locales/sl/common.json, and implement account selection and browser auto-detection.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: adding Slovenian support to the supported locale configuration.
Description check	✅ Passed	The description directly concerns Slovenian locale support and matches the enum, i18n target, and Day.js localization changes.
Out of Scope Changes check	✅ Passed	All reported changes support Slovenian locale registration and localization, so no unrelated code changes are evident.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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