feat: match Anbieter Login form styles to Mentor Login and show company name on Jobangebot

Anbieter Login (/anbieter-login/):
- Add auth-forms.css with styles matching the Mentor Login reference
  (navy pill buttons, bold #333 labels at 18px, consistent input sizing)
- Enqueue CSS only on the login page via stored page ID
- Strip legacy inline styles from page content via the_content filter
- Inject "Passwort vergessen?" link after login form
- Pixel-perfect field alignment between registration and login columns
  (matching Formidable's 97px field spacing, label padding, and margins)
- Override Formidable's flex-row submit wrapper for full-width button

Jobangebot (single job_offer):
- Display company name next to provider logo in a flex .job-header container
- Graceful fallback when logo or org name is missing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

assets/css/auth-forms.css

@@ -0,0 +1,164 @@
+/**
+ * Auth Forms Styles — Anbieter Login Page
+ *
+ * Matches the Mentor:innen Login styles from general.css.
+ * Loaded only on the anbieter-login page to override baked-in inline CSS.
+ *
+ * @package DDHH_Job_Manager
+ */
+
+/* -----------------------------------------------
+   Layout: two-column container
+   ----------------------------------------------- */
+.ddhh-auth-container {
+	display: flex;
+	gap: 2rem;
+	margin: 2rem 0;
+}
+
+@media (max-width: 768px) {
+	.ddhh-auth-container {
+		flex-direction: column;
+	}
+}
+
+/* -----------------------------------------------
+   Sections: remove gray card backgrounds
+   ----------------------------------------------- */
+.ddhh-register-section,
+.ddhh-login-section {
+	flex: 1;
+	padding: 2rem;
+	background: transparent;
+	border-radius: 0;
+	border: none;
+}
+
+.ddhh-register-section h2,
+.ddhh-login-section h2 {
+	margin-top: 0;
+	margin-bottom: 1.5rem;
+	color: #333;
+	font-size: 1.5rem;
+}
+
+/* -----------------------------------------------
+   Labels: match Mentor Login (color #333, 18px, bold)
+   High specificity to override Formidable's
+   .with_frm_style .frm_primary_label selectors
+   ----------------------------------------------- */
+.ddhh-auth-container label,
+.ddhh-auth-container .frm_forms.with_frm_style .frm_primary_label {
+	color: #333;
+	font-size: 18px;
+	font-weight: 700;
+	line-height: 18px;
+	margin-bottom: 0;
+}
+
+/* -----------------------------------------------
+   Inputs: match Mentor Login field sizing
+   ----------------------------------------------- */
+.ddhh-auth-container input[type="text"],
+.ddhh-auth-container input[type="email"],
+.ddhh-auth-container input[type="password"],
+.ddhh-auth-container input[type="url"],
+.ddhh-auth-container input[type="tel"],
+.ddhh-auth-container select {
+	width: 100%;
+	min-height: 40px;
+	max-width: 350px;
+	border: 0.0625rem solid;
+	border-radius: 3px;
+	padding: 0.1875rem 0.3125rem;
+	margin: 0 6px 16px 0;
+	box-sizing: border-box;
+	font-size: 16px;
+	line-height: normal;
+	font-family: "Poppins", Sans, Helvetica, Arial;
+}
+
+/* -----------------------------------------------
+   Formidable submit wrapper: override flex-row
+   so the button stretches to full width
+   ----------------------------------------------- */
+.ddhh-auth-container .frm_submit.frm_flex {
+	flex-direction: column;
+}
+
+/* -----------------------------------------------
+   Buttons: navy pill with red hover
+   High specificity to override Formidable's
+   .frm_style_formidable-style.with_frm_style selectors
+   ----------------------------------------------- */
+.ddhh-auth-container input[type="submit"],
+.ddhh-auth-container button[type="submit"],
+.ddhh-auth-container .frm_forms.with_frm_style .frm_submit button.frm_button_submit {
+	background-color: var(--wp--preset--color--primary, #003063);
+	border-width: 0;
+	color: #fff;
+	font-family: inherit;
+	font-size: inherit;
+	line-height: inherit;
+	padding: 0.4em 1.333em;
+	border-radius: 100px;
+	text-decoration: none;
+	width: 100%;
+	max-width: 350px;
+	cursor: pointer;
+	transition: all 0.7s ease;
+	box-sizing: border-box;
+}
+
+.ddhh-auth-container input[type="submit"]:hover,
+.ddhh-auth-container button[type="submit"]:hover,
+.ddhh-auth-container .frm_forms.with_frm_style .frm_submit button.frm_button_submit:hover {
+	background-color: var(--wp--preset--color--hhred, #E40613);
+}
+
+/* -----------------------------------------------
+   wp_login_form() specific: style the <p> wrappers
+   ----------------------------------------------- */
+.ddhh-login-section .login-username,
+.ddhh-login-section .login-password {
+	margin-bottom: 20px;
+}
+
+.ddhh-login-section .login-remember,
+.ddhh-login-section .login-submit {
+	margin-bottom: 1rem;
+}
+
+.ddhh-login-section .login-username br,
+.ddhh-login-section .login-password br {
+	display: none;
+}
+
+.ddhh-login-section .login-username label,
+.ddhh-login-section .login-password label {
+	display: block;
+	font-weight: 700;
+	margin-bottom: 0;
+	padding-bottom: 3px;
+}
+
+.ddhh-login-section .login-remember label {
+	font-weight: 700;
+}
+
+/* -----------------------------------------------
+   Passwort vergessen link
+   ----------------------------------------------- */
+.ddhh-login-section .login-lost-password {
+	margin-top: 0.75rem;
+}
+
+.ddhh-login-section .login-lost-password a {
+	color: var(--wp--preset--color--primary, #003063);
+	text-decoration: underline;
+	font-size: 0.9em;
+}
+
+.ddhh-login-section .login-lost-password a:hover {
+	color: var(--wp--preset--color--hhred, #E40613);
+}