chore: forms post to their own page instead of the form page type

The form page type (/form, 1704) existed because on the static pages of the
hybrid setup the page URL never reached TYPO3. With static rendering
retired, forms post to the page they are on, like the newsletter form:
the additionalParams in FormSetup.yaml, Page/Form.typoscript and the /form
entries of the PageType enhancers are gone.

Each form island gets the id form-island-<form identifier> (EXT:form
appends the content element uid), and Form.html targets and selects that
id instead of .form-island. With two forms on one page, a submission no
longer swaps in the first form's island.

Kept: hx-boost on the forms, HtmxRedirectMiddleware (Redirect finishers
under htmx) and /captcha (bw_captcha's image type).

Co-Authored-By: Claude Opus 5.5 <[email protected]>

config/sites/ep-reisen/config.yaml

@@ -282,7 +282,6 @@ routeEnhancers:
       /: 0
       /json: 1701
       /html: 1702
-      /form: 1704
       /captcha: 3413
       .json: 1803
       .ical: 1710

config/sites/ser/config.yaml

@@ -85,7 +85,6 @@ routeEnhancers:
     default: ''
     index: ''
     map:
-      /form: 1704
       /captcha: 3413
 routes:
   -

config/sites/ski-boarderweek/config.yaml

@@ -66,7 +66,6 @@ routeEnhancers:
       /: 0
       /json: 1701
       /html: 1702
-      /form: 1704
       /captcha: 3413
       sitemap.xml: 1533906435
       yoast-snippetpreview.json: 1480321830

config/sites/ski-wochenenden/config.yaml

@@ -50,7 +50,6 @@ routeEnhancers:
       /: 0
       /json: 1701
       /html: 1702
-      /form: 1704
       /captcha: 3413
       sitemap.xml: 1533906435
       yoast-snippetpreview.json: 1480321830

config/sites/snowzone/config.yaml

@@ -50,7 +50,6 @@ routeEnhancers:
       /: 0
       /json: 1701
       /html: 1702
-      /form: 1704
       /captcha: 3413
       sitemap.xml: 1533906435
       yoast-snippetpreview.json: 1480321830

config/sites/unichamp/config.yaml

@@ -50,7 +50,6 @@ routeEnhancers:
       /: 0
       /json: 1701
       /html: 1702
-      /form: 1704
       /captcha: 3413
       sitemap.xml: 1533906435
       yoast-snippetpreview.json: 1480321830

packages/ep_theme/Configuration/TypoScript/Page/Form.typoscript

@@ -1,29 +0,0 @@
-# The forms of a page without the page around them (/path/form). The static pages of the hybrid
-# setup load this into a placeholder with htmx, and the forms post back to it (see
-# FormSetup.yaml): the page URL itself is a static file that never reaches TYPO3.
-# Every form page has a single form, wherever it sits (a grid or container counts as well).
-
-tx_eptheme_form = PAGE
-tx_eptheme_form {
-    typeNum = 1704
-    config {
-        disableAllHeaderCode = 1
-        disablePrefixComment = 1
-        additionalHeaders.10.header = Content-Type: text/html; charset=utf-8
-        additionalHeaders.20.header = X-Robots-Tag: noindex, nofollow
-        admPanel = 0
-        debug = 0
-    }
-
-    10 = CONTENT
-    10 {
-        table = tt_content
-        select {
-            where = {#CType} = 'form_formframework'
-            orderBy = sorting
-        }
-        # Only the plugin (Templates/Form/Render.html, a .form-island): header and frame stay on
-        # the static page
-        renderObj =< tt_content.form_formframework.20
-    }
-}

packages/ep_theme/Configuration/Yaml/FormSetup.yaml

@@ -19,10 +19,6 @@ TYPO3:
                 # Every form has a captcha
                 honeypot:
                   enable: false
-                # Forms post to the form page type (tx_eptheme_form, /form): on the static
-                # pages of the hybrid setup the page URL itself never reaches TYPO3
-                additionalParams:
-                  type: 1704
 
           finishersDefinition:
             BpnApiFinisher:

packages/ep_theme/Resources/Private/Templates/Form/Form.html

@@ -13,11 +13,11 @@
                 additionalAttributes="{formvh:translateElementProperty(element: form, property: 'fluidAdditionalAttributes')}"
                 data="{'controller': 'form-debounce', 'action': 'form-debounce#debounce', 'form-debounce-disabled-class': 'cursor-not-allowed'}"
                 hx-boost="true"
-                hx-target="closest .form-island"
-                hx-select=".form-island"
+                hx-target="#form-island-{form.identifier}"
+                hx-select="#form-island-{form.identifier}"
                 hx-swap="outerHTML"
                 hx-push-url="false"
-                hx-indicator="closest .form-island"
+                hx-indicator="#form-island-{form.identifier}"
         >
             <f:render partial="{form.currentPage.templateName}" arguments="{page: form.currentPage}" />
             <div class="actions">

packages/ep_theme/Resources/Private/Templates/Form/Render.html

@@ -1,5 +1,5 @@
 <html xmlns:f="http://typo3.org/ns/TYPO3/CMS/Fluid/ViewHelpers" xmlns:formvh="http://typo3.org/ns/TYPO3/CMS/Form/ViewHelpers" data-namespace-typo3-fluid="true">
-<f:render partial="Form/Island" contentAs="content">
+<f:render partial="Form/Island" arguments="{id: 'form-island-{formConfiguration.identifier}'}" contentAs="content">
     <f:flashMessages />
     <f:if condition="{formConfiguration}">
         <div class="py-8">