Fix/component unit tests following empty state

[Mosas2000]

• Closes Add unit tests for the creator card component rendering the correct price and holder count from props #767
• Closes Add unit tests for the XLM price formatter rendering the correct number of decimal places across different values #766
• Closes Add unit tests for the transaction type badge rendering the correct label and colour for buy and sell transactions #765
• Closes Add an empty state to the following page when the wallet follows no creators #764

Key Changes

1. XLM Price Formatter & Unit Tests (#766)

• Implemented formatXlmPrice in numberFormat.utils.ts to format XLM amounts with two decimal places.
• Added unit tests in xlmPriceFormatter.test.ts verifying whole numbers (10.00 XLM), fractional values (0.50 XLM), small values (0.001 -> 0.00 XLM), rounding (1000.999 -> 1001.00 XLM), and zero (0.00 XLM).

2. Transaction Type Badge Component & Unit Tests (#765)

• Introduced TransactionTypeBadge component to render styled badges (Buy in green, Sell in red, and Unknown in grey).
• Integrated TransactionTypeBadge into TransactionHistory.
• Added unit tests in TransactionTypeBadge.test.tsx verifying labels, color classes, and fallback behavior for missing/unknown types without throwing errors.

3. Creator Card Component & Unit Tests (#767)

• Updated CreatorCard to format zero prices as 0.00 XLM, null prices as a dash placeholder (—), and holder counts as X holders.
• Wrapped creator profile names with navigation links pointing to /creator/:id.
• Added unit tests in CreatorCard.props.test.tsx confirming prop rendering, zero value resilience, dash placeholders, and route link attributes.

4. Following Page Empty State & Unit Tests (#764)

• Created FollowingPage component rendering a loading skeleton during query fetch and an empty state once the query settles with an empty array.
• Displayed empty state message: "You are not following anyone yet — discover creators on the marketplace".
• Included a "Browse Marketplace" button navigating to /creators.
• Added /following route to routes.tsx and unit tests in FollowingPage.test.tsx.

Verification

• Unit Tests: All 18 unit tests passed across xlmPriceFormatter.test.ts, TransactionTypeBadge.test.tsx, CreatorCard.props.test.tsx, and FollowingPage.test.tsx.
• Lint & Build: Executed pnpm check (eslint . && tsc -b && vite build) with zero linting or TypeScript compilation errors.

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