Unify onboarding copy to informal German (“du”) across user-facing UI

[Copilot]

The onboarding flow mixed formal and informal German address, creating inconsistent UX tone across pages and dialogs. This PR standardizes user-facing copy to du-form throughout the onboarding/profile/auth surfaces.

• Scope: copy standardization (no behavior changes)

  • Replaced formal forms (Sie/Ihr/Ihnen...) with informal forms (du/dein/dir...) in UI strings only.
  • Kept component structure, logic, and flows unchanged.

• Updated onboarding pages

  • src/pages/WelcomePage.tsx
  • src/pages/FeaturesPage.tsx
  • src/pages/UserTypePage.tsx
  • src/pages/RegisterPage.tsx
  • src/pages/UserDashboardPage.tsx
  • src/pages/EditProfilePage.tsx
  • src/pages/PlatformDashboardPage.tsx

• Updated shared/profile/auth components

  • src/components/EditProfileForm.tsx
  • src/components/auth/LoginDialog.tsx

• Representative text change

  // before
  description: 'Bearbeiten Sie Ihr Nostr-Profil.'
  
  // after
  description: 'Bearbeite dein Nostr-Profil.'

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• npm.jsr.io
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node /home/REDACTED/work/_temp/ghcca-node/node/bin/npm i --silent (dns block)
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node /home/REDACTED/work/_temp/ghcca-node/node/bin/npm i (dns block)
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node /home/REDACTED/work/_temp/ghcca-node/node/bin/npm i ep/bin/linux-x64/rg (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>[FEATURE]: Duzen</issue_title>
<issue_description>### Problem / Motivation

Bei den anderen Seiten & Tools duzen wir, daher würde ich das einheitlich machen

Gewünschte Lösung

Du statt Sie

Alternative Lösungen

No response

Priorität aus Nutzer-Sicht

Critical (Ohne das Feature ist die App für mich unbrauchbar)

UI-Mockup / Design-Idee

No response

Zusätzlicher Kontext

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [FEATURE]: Duzen #61

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