feat: add theme selector to unauthenticated pages

DESIGN_GUIDELINES.md

@@ -81,7 +81,7 @@ If the `<.header>` is outside the `<.form>`, the submit button must reference th
 Pages that do not require authentication (e.g. `/join`, `/sign-in`, `/confirm_join/:token`) use a unified layout via the **`Layouts.public_page`** component:
 
 - **Component:** `Layouts.public_page` renders:
-  - **Header:** Logo + "Mitgliederverwaltung" (left) | Club name centered via absolute positioning | Language selector (right)
+  - **Header:** Logo + "Mitgliederverwaltung" (left) | Club name centered via absolute positioning | Language selector + theme swap (sun/moon, DaisyUI swap with rotate) (right)
   - Main content slot, Flash group. No sidebar, no authenticated-layout logic.
 - **Content:** DaisyUI **hero** section (`hero`, `hero-content`) for the main message or form, so all public pages share the same visual structure. The hero is constrained in width (`max-w-4xl mx-auto`) and content is left-aligned (`hero-content flex-col items-start text-left`).
 - **Locale handling:** The language selector uses `Gettext.get_locale(MvWeb.Gettext)` (backend-specific) to correctly reflect the active locale. `SignInLive` sets both `Gettext.put_locale(MvWeb.Gettext, locale)` and `Gettext.put_locale(locale)` to keep global and backend locales in sync.
@@ -98,16 +98,18 @@ Use these standard roles:
 | Role | Use | Class |
 |---|---|---|
 | Page title (H1) | main page title | `text-xl font-semibold leading-8` |
-| Subtitle | helper under title | `text-sm text-base-content/70` |
+| Subtitle | helper under title | `text-sm text-base-content/85` |
 | Section title (H2) | section headings | `text-lg font-semibold` |
-| Helper text | under inputs | `text-sm text-base-content/70` |
-| Fine print | small hints | `text-xs text-base-content/60` |
-| Empty state | no data | `text-base-content/60 italic` |
+| Helper text | under inputs | `text-sm text-base-content/85` |
+| Fine print | small hints | `text-xs text-base-content/80` |
+| Empty state | no data | `text-base-content/80 italic` |
 | Destructive text | danger | `text-error` |
 
 **MUST:** Page titles via `<.header>`.  
 **MUST:** Section titles via `<.form_section title="…">` (for forms) or a consistent section wrapper (if you introduce a `<.card>` later).
 
+**Form labels (WCAG 2.2 AA):** DaisyUI `.label` defaults to 60% opacity and fails contrast. We override it in `app.css` to 85% of `base-content` so labels stay slightly de‑emphasised vs body text but meet the 4.5:1 minimum. Use `class="label"` and `<span class="label-text">` as usual; no extra classes needed.
+
 ---
 
 ## 4) States: Loading, Empty, Error (mandatory consistency)

assets/css/app.css

@@ -154,6 +154,14 @@
   background-color: var(--color-base-100);
 }
 
+/* WCAG 2.2 AA (4.5:1 for normal text): Form labels. DaisyUI .label uses 60% opacity,
+   which fails contrast. Override to 85% of base-content so labels stay slightly
+   de‑emphasised vs body text but meet the minimum ratio. */
+[data-theme="light"] .label,
+[data-theme="dark"] .label {
+  color: color-mix(in oklab, var(--color-base-content) 85%, transparent);
+}
+
 /* WCAG 2.2 AA (4.5:1 for normal text): Badge text must contrast with badge background.
    Theme tokens *-content are often too light on * backgrounds in light theme, and
    badge-soft uses variant as text on a light tint (low contrast). We override

lib/mv_web/components/core_components.ex

@@ -1295,6 +1295,41 @@ defmodule MvWeb.CoreComponents do
     """
   end
 
+  @doc """
+  Renders a theme toggle using DaisyUI swap (sun/moon with rotate effect).
+
+  Wired to the theme script in root layout: checkbox uses `data-theme-toggle`,
+  root script syncs checked state (checked = dark) and listens for `phx:set-theme`.
+  Use in public header or sidebar. Optional `class` is applied to the wrapper.
+  """
+  attr :class, :string, default: nil, doc: "Optional extra classes for the swap wrapper"
+
+  def theme_swap(assigns) do
+    assigns = assign(assigns, :wrapper_class, assigns[:class])
+
+    ~H"""
+    <div class={[@wrapper_class]}>
+      <label
+        class="swap swap-rotate cursor-pointer focus-within:outline-none focus-within:focus-visible:ring-2 focus-within:focus-visible:ring-primary focus-within:focus-visible:ring-offset-2 rounded"
+        aria-label={gettext("Toggle dark mode")}
+      >
+        <input
+          type="checkbox"
+          data-theme-toggle
+          aria-label={gettext("Toggle dark mode")}
+          onchange="window.dispatchEvent(new CustomEvent('phx:set-theme',{detail:{theme:this.checked?'dark':'light'}}))"
+        />
+        <span class="swap-on size-6 flex items-center justify-center" aria-hidden="true">
+          <.icon name="hero-moon" class="size-5" />
+        </span>
+        <span class="swap-off size-6 flex items-center justify-center" aria-hidden="true">
+          <.icon name="hero-sun" class="size-5" />
+        </span>
+      </label>
+    </div>
+    """
+  end
+
   @doc """
   Renders a [Heroicon](https://heroicons.com).
 

lib/mv_web/components/layouts.ex

@@ -39,18 +39,21 @@ defmodule MvWeb.Layouts do
       <span class="absolute left-1/2 -translate-x-1/2 text-lg font-bold text-center max-w-[50%] truncate">
         {@club_name}
       </span>
-      <form method="post" action={~p"/set_locale"} class="shrink-0">
-        <input type="hidden" name="_csrf_token" value={Plug.CSRFProtection.get_csrf_token()} />
-        <select
-          name="locale"
-          onchange="this.form.submit()"
-          class="select select-sm focus:outline-none focus:ring-2 focus:ring-primary focus:ring-offset-2"
-          aria-label={gettext("Select language")}
-        >
-          <option value="de" selected={Gettext.get_locale(MvWeb.Gettext) == "de"}>Deutsch</option>
-          <option value="en" selected={Gettext.get_locale(MvWeb.Gettext) == "en"}>English</option>
-        </select>
-      </form>
+      <div class="shrink-0 flex items-center gap-2">
+        <form method="post" action={~p"/set_locale"}>
+          <input type="hidden" name="_csrf_token" value={Plug.CSRFProtection.get_csrf_token()} />
+          <select
+            name="locale"
+            onchange="this.form.submit()"
+            class="select select-sm focus:outline-none focus:ring-2 focus:ring-primary focus:ring-offset-2"
+            aria-label={gettext("Select language")}
+          >
+            <option value="de" selected={Gettext.get_locale(MvWeb.Gettext) == "de"}>Deutsch</option>
+            <option value="en" selected={Gettext.get_locale(MvWeb.Gettext) == "en"}>English</option>
+          </select>
+        </form>
+        <.theme_swap />
+      </div>
     </header>
     <main class="px-4 py-8 sm:px-6">
       <div class="mx-auto max-full space-y-4">
@@ -156,18 +159,21 @@ defmodule MvWeb.Layouts do
         <span class="absolute left-1/2 -translate-x-1/2 text-lg font-bold text-center max-w-[50%] truncate">
           {@club_name}
         </span>
-        <form method="post" action={~p"/set_locale"} class="shrink-0">
-          <input type="hidden" name="_csrf_token" value={Plug.CSRFProtection.get_csrf_token()} />
-          <select
-            name="locale"
-            onchange="this.form.submit()"
-            class="select select-sm focus:outline-none focus:ring-2 focus:ring-primary focus:ring-offset-2"
-            aria-label={gettext("Select language")}
-          >
-            <option value="de" selected={Gettext.get_locale(MvWeb.Gettext) == "de"}>Deutsch</option>
-            <option value="en" selected={Gettext.get_locale(MvWeb.Gettext) == "en"}>English</option>
-          </select>
-        </form>
+        <div class="shrink-0 flex items-center gap-2">
+          <form method="post" action={~p"/set_locale"}>
+            <input type="hidden" name="_csrf_token" value={Plug.CSRFProtection.get_csrf_token()} />
+            <select
+              name="locale"
+              onchange="this.form.submit()"
+              class="select select-sm focus:outline-none focus:ring-2 focus:ring-primary focus:ring-offset-2"
+              aria-label={gettext("Select language")}
+            >
+              <option value="de" selected={Gettext.get_locale(MvWeb.Gettext) == "de"}>Deutsch</option>
+              <option value="en" selected={Gettext.get_locale(MvWeb.Gettext) == "en"}>English</option>
+            </select>
+          </form>
+          <.theme_swap />
+        </div>
       </header>
       <main class="px-4 py-8 sm:px-6">
         <div class="mx-auto space-y-4 max-full">

lib/mv_web/components/layouts/sidebar.ex

@@ -251,21 +251,22 @@ defmodule MvWeb.Layouts.Sidebar do
   defp sidebar_footer(assigns) do
     ~H"""
     <div class="mt-auto p-4 border-t border-base-300 space-y-4">
-      <!-- Language Selector (nur expanded) -->
-      <form method="post" action={~p"/set_locale"} class="expanded-only">
-        <input type="hidden" name="_csrf_token" value={get_csrf_token()} />
-        <select
-          name="locale"
-          onchange="this.form.submit()"
-          class="select select-sm w-full focus:outline-none focus:ring-2 focus:ring-primary focus:ring-offset-2"
-          aria-label={gettext("Select language")}
-        >
-          <option value="de" selected={Gettext.get_locale(MvWeb.Gettext) == "de"}>Deutsch</option>
-          <option value="en" selected={Gettext.get_locale(MvWeb.Gettext) == "en"}>English</option>
-        </select>
-      </form>
-      <!-- Theme Toggle (immer sichtbar) -->
-      <.theme_toggle />
+      <!-- Theme swap + Language selector in one row (theme left, language right when expanded) -->
+      <div class="flex items-center gap-2">
+        <.theme_swap />
+        <form method="post" action={~p"/set_locale"} class="expanded-only flex-1 min-w-0">
+          <input type="hidden" name="_csrf_token" value={get_csrf_token()} />
+          <select
+            name="locale"
+            onchange="this.form.submit()"
+            class="select select-sm w-full focus:outline-none focus:ring-2 focus:ring-primary focus:ring-offset-2"
+            aria-label={gettext("Select language")}
+          >
+            <option value="de" selected={Gettext.get_locale(MvWeb.Gettext) == "de"}>Deutsch</option>
+            <option value="en" selected={Gettext.get_locale(MvWeb.Gettext) == "en"}>English</option>
+          </select>
+        </form>
+      </div>
       <!-- User Menu (nur wenn current_user existiert) -->
       <%= if @current_user do %>
         <.user_menu current_user={@current_user} />
@@ -274,29 +275,6 @@ defmodule MvWeb.Layouts.Sidebar do
     """
   end
 
-  defp theme_toggle(assigns) do
-    ~H"""
-    <label
-      class="flex items-center gap-2 cursor-pointer justify-center focus-within:outline-none focus-within:ring-2 focus-within:ring-primary focus-within:ring-offset-2"
-      aria-label={gettext("Toggle dark mode")}
-    >
-      <.icon name="hero-sun" class="size-5" aria-hidden="true" />
-      <div id="theme-toggle" phx-update="ignore">
-        <input
-          id="theme-toggle-input"
-          type="checkbox"
-          class="toggle toggle-sm focus:outline-none"
-          data-theme-toggle
-          onchange="window.dispatchEvent(new CustomEvent('phx:set-theme',{detail:{theme:this.checked?'dark':'light'}}))"
-          aria-label={gettext("Toggle dark mode")}
-        />
-      </div>
-
-      <.icon name="hero-moon" class="size-5" aria-hidden="true" />
-    </label>
-    """
-  end
-
   attr :current_user, :map, default: nil, doc: "The current user"
 
   defp user_menu(assigns) do

lib/mv_web/live/join_live.ex

@@ -100,13 +100,13 @@ defmodule MvWeb.JoinLive do
                     />
                   </div>
 
-                  <p class="text-sm text-base-content/70">
+                  <p class="text-sm text-base-content/85">
                     {gettext(
                       "By submitting your application you will receive an email with a confirmation link. Once you have confirmed your email address, your application will be reviewed."
                     )}
                   </p>
 
-                  <p class="text-xs text-base-content/60">
+                  <p class="text-xs text-base-content/80">
                     {gettext(
                       "Your details are only used to process your membership application and to contact you. To prevent abuse we also process technical data (e.g. IP address) only as necessary."
                     )}