Rebuild auth pages on the project design system

Rewrites resources/scripts/layouts/AuthLayout.vue from scratch using only the @theme tokens defined in themes.css and registered via @theme inline in invoiceshelf.css. The new layout is a centered card on the existing bg-glass-gradient utility, using the same visual vocabulary as BaseCard (bg-surface, rounded-xl, border-line-default, shadow-sm) so the auth pages read as a smaller, simpler version of the admin's existing card pattern. Both light and dark mode work automatically because every color references a theme token rather than a hardcoded hex/rgb.

Drops the previous attempt's hardcoded #0a0e1a / #fbbf24 / #f5efe5 palette, the imported Google Fonts (Fraunces / Manrope / JetBrains Mono — replaced with the project default Poppins via font-base), the local --ink / --brass / --cream CSS variables that ignored [data-theme=dark], and the :deep() overrides that forced BaseInput / BaseButton into a custom underline style. The form components now render in the auth card identically to how they render anywhere else in the admin — same components, same theme tokens, no overrides.

Removes four legacy SVG decorations from the original two-panel design: LoginPlanetCrater, LoginBackground, LoginBackgroundOverlay, LoginBottomVector. The page now has no decorative imagery — the bg-glass-gradient utility carries the visual mood.

Adds w-full justify-center to the four auth-form submit buttons (LoginView, ForgotPasswordView, ResetPasswordView, RegisterWithInvitationView) so they fill the auth card width with their labels centered. Done at the call site rather than via :deep() so BaseButton stays untouched and the rest of the admin keeps its inline button style. Route-aware heading/subheading copy is preserved for all four auth views, and the four window.* admin customization hooks (login_page_logo, login_page_heading, login_page_description, copyright_text) still work.

resources/scripts/features/auth/views/ForgotPasswordView.vue

@@ -21,6 +21,7 @@
       :disabled="isLoading"
       type="submit"
       variant="primary"
+      class="w-full justify-center"
     >
       <div v-if="!isSent">
         {{ $t('validation.send_reset_link') }}