Resolve Darkmode issue in onboarding && Add tooltip for hover on lsidebar links

[Lantum-Brendan]

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Deploying webui with    Cloudflare Pages

Latest commit:	93d943f
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[Lantum-Brendan]

Summary:
Commit no!: Resolves inconsistent application of darkmode on home page.
Commit no2: Adds sub text on the sidebar links addressing issue: #58

commit no3:

• Handles submit buttons on forms disabled after submit to avoid duplicate submissions. Issue:enh: Disable submit buttons on submit #57

• Properly handles success false/ 400 server error upon successful creation of categories (This occurs when created item already exist) by logging the error message in the form and thus not resubmitting. Function extended to Properties,Categories etc to avoid similar issues. issue: feat: Add categories sometimes return 400 after successful addition but failed fetch #56

[sourceant]

Code Review Summary

This PR resolves dark mode styling issues in the onboarding flow and enhances the sidebar with descriptive subtext. It also standardizes form submission states and error handling.

🚀 Key Improvements

• Dark mode support for onboarding via CSS variables.
• Informative subtext added to sidebar navigation links.
• Consistent loading and error states across all CRUD forms.
• Better API result extraction logic.

💡 Minor Suggestions

• Extract duplicated API helper functions into a shared utility file.
• The use of min-height on sidebar items is a good defensive CSS practice.

[sourceant]

Review complete. See the overview comment for a summary.

[sourceant]

The logic for createApiBusinessError and extractCategoryMutationResult is duplicated across almost all API service files (categories, parties, reminders, wallets). This should be moved to a shared utility like apiHelpers.ts to reduce technical debt and maintenance overhead.

Suggested change

	function createApiBusinessError(message: string, errors: string[] = []): Error {
	// Move these functions to @/services/api/apiHelpers.ts and import them instead.

[Lantum-Brendan]

Attached images : 1 darkmode in onboarding applied, sub-titles on sidebar links added.

buttons disabled upon submit on all pages