Corrige trois régressions du restyling du formulaire de ligne comptable

- Le select "Type de ligne" affichait un chevron géant répété (le
  shorthand `background: transparent` sur input/select/textarea
  réinitialisait aussi position/repeat/size de Claro, transformant sa
  flèche unique alignée à droite en motif carrelé). Les select gardent
  maintenant leur background Claro intact.
- Les menus "Toggle Actions" (⋮) de la Répartition étaient ouverts en
  permanence : mon display:flex écrasait le display:none par défaut de
  Claro, cassant le toggle piloté par paragraphs.actions.js. Rescopé à
  `.paragraphs-dropdown.open .paragraphs-dropdown-actions`.
- Marges resserrées : le `.form-item { margin-block: 1.5rem }` de Claro
  s'ajoutait à notre propre grid-gap. Neutralisé (`margin-block: 0`), et
  gap/paddings réduits.

web/modules/custom/figli_compta_ledger/css/ledger-form.css

@@ -26,12 +26,18 @@
 
   display: grid;
   grid-template-columns: repeat(3, 1fr);
-  gap: 0.9rem 1rem;
+  gap: 0.5rem 1rem;
   max-width: 44rem;
   margin: 0 auto;
   padding: 0.15rem 0.1rem 0.5rem;
   color: var(--flform-text);
 }
+/* Claro gives every .form-item a large margin-block (1.5rem, meant for a
+   form with one field per row) -- with our own grid `gap` now doing that
+   job, this just doubles up the spacing between rows. */
+.figli-ledger-form .form-item {
+  margin-block: 0;
+}
 html.gin--dark-mode .figli-ledger-form {
   --flform-border: #3d3e42;
   --flform-border-soft: #333438;
@@ -92,11 +98,20 @@ html.gin--dark-mode .figli-ledger-form {
   box-sizing: border-box;
   border: 1px solid var(--flform-border);
   border-radius: 6px;
-  padding: 0.4rem 0.55rem;
+  padding: 0.32rem 0.5rem;
   font-size: 0.88rem;
-  background: transparent;
   color: var(--flform-text);
 }
+/* Not select: Claro positions its dropdown-chevron background-image via
+   background-position/-repeat/-size, which the `background` shorthand
+   below would silently reset to their initial values (top-left,
+   repeating) -- that turned the single right-aligned arrow into a tiled
+   pattern smeared across the whole field. Selects keep Claro's own
+   background untouched; only the border/radius/padding above apply. */
+.figli-ledger-form input.form-element,
+.figli-ledger-form textarea.form-element {
+  background: transparent;
+}
 .figli-ledger-form input.form-element:focus,
 .figli-ledger-form select.form-element:focus,
 .figli-ledger-form textarea.form-element:focus {
@@ -130,10 +145,10 @@ html.gin--dark-mode .figli-ledger-form {
 }
 .figli-ledger-form table.field-multiple-table thead th {
   text-align: left;
-  padding: 0.5rem 0.6rem 0.35rem;
+  padding: 0.4rem 0.6rem 0.25rem;
 }
 .figli-ledger-form table.field-multiple-table tbody td {
-  padding: 0.5rem 0.6rem;
+  padding: 0.35rem 0.6rem;
   vertical-align: top;
   border-top: 1px solid var(--flform-border-soft);
 }
@@ -181,7 +196,13 @@ html.gin--dark-mode .figli-ledger-form {
 .figli-ledger-form .paragraphs-dropdown-toggle:hover {
   color: var(--flform-accent);
 }
-.figli-ledger-form .paragraphs-dropdown-actions {
+/* Closed by default (Claro's own paragraphs.actions.css already sets
+   display: none here and toggles a sibling .open class on click via
+   paragraphs.actions.js) -- only restyle the panel's look, and only once
+   Drupal's own JS has actually opened it. Getting this wrong (e.g.
+   forcing `display: flex` unconditionally here) makes every "Toggle
+   Actions" menu render permanently expanded. */
+.figli-ledger-form .paragraphs-dropdown.open .paragraphs-dropdown-actions {
   display: flex;
   flex-direction: column;
   gap: 0.2rem;