fix: Improve broken mobile payment dropdown

[motionduck]

Changelog:

• Fix mobile payment expand not triggering correctly
• Change currency pipe's EUR locale to de-DE, and default display to 'symbol'
• Slight change in footer text

Closes #497

[Copilot]

Pull request overview

Note

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This PR addresses a broken mobile payment dropdown expand behavior, updates default currency formatting for EUR, and tweaks footer text.

Changes:

• Update AppCurrencyPipe defaults (EUR locale de-DE, default currency display symbol) and relax a brittle assertion in its unit test.
• Refactor mobile PaymentItemComponent dropdown height/animation handling using signals and a transition suppression flag.
• Update footer text to include a v prefix and remove the “Developed by …” line.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
app/mikane/src/app/shared/currency/app-currency.pipe.ts	Changes EUR locale mapping and default currency display mode.
app/mikane/src/app/shared/currency/app-currency.pipe.spec.ts	Adjusts USD assertion to allow runtime Intl differences.
app/mikane/src/app/features/mobile/payment-item/payment-item.component.ts	Reworks dropdown open/close height calculation with timers + transition suppression.
app/mikane/src/app/features/mobile/payment-item/payment-item.component.spec.ts	Updates tests to drive expanded input and uses fake timers deterministically.
app/mikane/src/app/features/mobile/payment-item/payment-item.component.scss	Adds .no-transition modifier to suppress height transitions.
app/mikane/src/app/features/mobile/payment-item/payment-item.component.html	Binds height to a signal and applies .no-transition class conditionally.
app/mikane/src/app/features/footer/footer.component.html	Updates footer copy/formatting.

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