refactor(profile): drop extended-profile editing, keep right-panel display

Extended-profile fields (io.element.profile.*) are no longer edited in the
client, so remove the edit form and the dead code that came with it, keeping
only the read-only right-panel display (UserExtendedProfileInfo).

- Remove ExtendedProfileSettings (edit form) + its Settings integration and CSS
- Remove ExtendedProfileView (never-rendered, dead) + its CSS
- Inline the EXT_PROFILE_KEY_* constants into UserExtendedProfileInfo so it no
  longer depends on the deleted settings component
- Drop now-unused set/deleteExtendedProfileProperty from UserProfilesStore
- Prune dead settings|extended_profile_settings|* i18n keys (and the unused
  user_info.extended_profile header/not_provided keys) across all locales
- Regenerate _components.pcss
- Revert UserProfileSettings/AccountUserSettingsTab tests (+snapshot) to master,
  since their adaptations existed only for the removed edit form

apps/web/res/css/views/right_panel/_ExtendedProfileView.pcss

@@ -1,79 +0,0 @@
-/*
-Copyright 2025 New Vector Ltd.
-
-SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
-Please see LICENSE files in the repository root for full details.
-*/
-
-.mx_ExtendedProfileView {
-    /* Anpassung an das bestehende UserInfo Panel */
-    font-size: var(--cpd-font-size-body-sm);
-    padding: 0;
-
-    /* Styling für das Accordion */
-    .mx_ExtendedProfileView_accordion {
-        width: 100%;
-    }
-
-    /* Abstand zwischen den Feldern */
-    .mx_ExtendedProfileView_content {
-        padding: var(--cpd-space-2x) 0;
-        display: flex;
-        flex-direction: column;
-        gap: var(--cpd-space-4x);
-    }
-
-    /* Styling für die Felder */
-    .mx_ExtendedProfileView_field {
-        margin-bottom: var(--cpd-space-2x);
-
-        .mx_ExtendedProfileView_icon {
-            width: 20px;
-            height: 20px;
-            color: var(--cpd-color-icon-secondary);
-            flex-shrink: 0;
-        }
-    }
-
-    /* Labels und Werte */
-    .mx_ExtendedProfileView_label {
-        color: var(--cpd-color-text-secondary);
-        font-size: var(--cpd-font-size-body-xs);
-        margin-bottom: var(--cpd-space-1x);
-    }
-
-    .mx_ExtendedProfileView_value {
-        color: var(--cpd-color-text-primary);
-        word-break: break-word;
-
-        &.mx_ExtendedProfileView_multiline {
-            white-space: pre-line;
-            margin-top: var(--cpd-space-1x);
-        }
-    }
-
-    /* Spezielle Styles für Website-Links */
-    .mx_ExtendedProfileView_link {
-        color: var(--cpd-color-text-action-accent);
-        text-decoration: none;
-
-        &:hover {
-            text-decoration: underline;
-        }
-    }
-
-    /* Für Bereich "Weitere Informationen" */
-    .mx_ExtendedProfileView_further_info {
-        padding: var(--cpd-space-1x) 0;
-    }
-
-    /* Loading State */
-    .mx_ExtendedProfileView_loading {
-        padding: var(--cpd-space-4x) 0;
-    }
-
-    /* Error State */
-    .mx_ExtendedProfileView_error {
-        margin: var(--cpd-space-2x) 0;
-    }
-}