Fix table jitter, horizontal scroll, and vertical scroll snapping on /lignes

Root cause: the main table used auto layout, so every loadOlder()/
loadNewer() reflowed every column's width based on whatever was
currently loaded -- visibly shifting the table, spilling past the
viewport into a horizontal scrollbar, and corrupting loadOlder()'s
scroll-position compensation (which assumes the scrollHeight delta
after prepending rows is *only* the new rows' own height -- not true
once existing rows also reflow). That's what made scrolling up feel
like it kept snapping back down.

- table-layout: fixed with explicit per-column widths (percentages
  throughout, not mixed with rem -- mixing meant the rem columns' width
  was added on top of the percentage budget instead of coming out of
  it), plus box-sizing: border-box so padding doesn't inflate columns
  beyond their declared width.
- overflow-x: hidden instead of auto on the scroll container: with both
  x and y auto on the same element, the browser has to guess whether a
  vertical scrollbar will appear before laying out width: 100%, and a
  wrong guess understates available width by a scrollbar's worth --
  exactly enough to tip a tightly-fitting table into needing horizontal
  scroll too.
- Fixed a footer-row column count bug found along the way: it still had
  two actions-col cells and a colspan=5 label from before the link
  button was removed, leaving the label 6 columns short of Signalement
  and misaligning every footer cell after it.

Verified with a 25-round scripted scroll-up stress test spanning 3
loadOlder() triggers: scroll position stays correctly anchored near
where the user was looking, never jumps toward the bottom.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

web/modules/custom/figli_compta_ledger/css/home.css

@@ -159,24 +159,49 @@ html.gin--dark-mode #figli-home-app {
 }
 
 #figli-home-app .figli-table-wrap {
-  overflow-x: auto;
+  /* Fixed columns below are sized to always fit -- hidden (not auto) so
+     there's never a horizontal scrollbar to fight the vertical one for
+     layout space. With both set to auto, the browser has to guess
+     whether a vertical scrollbar will appear before it can lay out the
+     table's width:100%, and getting that guess wrong understates the
+     available width by one scrollbar's worth, which was enough to tip
+     this from "just barely fits" into "needs to scroll horizontally
+     too" -- and any actual residual overflow (a column pushed a few px
+     over by content this doesn't attempt to break) is silently clipped
+     here instead of surfacing a scrollbar for it. */
+  overflow-x: hidden;
   border: 1px solid var(--figli-border);
   border-radius: 6px;
   max-height: 75vh;
   overflow-y: auto;
 }
 
+/* table-layout: fixed -- auto layout was recomputing every column's
+   width from whatever happened to be currently loaded, so the table
+   visibly reflowed (and drifted wider than the viewport, forcing
+   horizontal scroll) every time loadOlder()/loadNewer() brought in rows
+   with different content. Fixed layout locks each column to the widths
+   set below regardless of content, so the table's total width never
+   changes -- no more horizontal scroll, and loadOlder()'s scroll
+   compensation (which assumes the height delta after prepending is
+   *only* the new rows' own height) is now accurate again, since existing
+   rows no longer reflow when new ones are added. */
 #figli-home-app table {
   width: 100%;
+  table-layout: fixed;
   border-collapse: collapse;
   background: var(--figli-bg);
   color: var(--figli-text);
   font-size: 0.8rem;
-  white-space: nowrap;
 }
 
 #figli-home-app th,
 #figli-home-app td {
+  /* border-box -- otherwise each column's percentage width (fixed
+     layout, above) sets only the content box, and this cell's own
+     padding/border get added on top of it, so 18 columns' worth of
+     padding quietly pushes the table wider than 100% again. */
+  box-sizing: border-box;
   text-align: left;
   padding: 0.3rem 0.6rem;
   border-bottom: 1px solid var(--figli-border);
@@ -201,16 +226,16 @@ html.gin--dark-mode #figli-home-app {
   font-variant-numeric: tabular-nums;
 }
 
+#figli-home-app th:nth-child(6),
 #figli-home-app td.figli-libelle {
+  width: 15%;
   white-space: normal;
-  min-width: 220px;
-  max-width: 340px;
 }
 
+#figli-home-app th:nth-child(7),
 #figli-home-app td.figli-flag-cell {
+  width: 8%;
   white-space: normal;
-  min-width: 120px;
-  max-width: 220px;
 }
 
 #figli-home-app tr.figli-group-row td {
@@ -378,12 +403,52 @@ html.gin--dark-mode #figli-home-app {
    table's default 0.6rem horizontal cell padding. */
 #figli-home-app td.actions-col,
 #figli-home-app th.actions-col {
-  width: 1%;
+  width: 3%;
   padding: 0.2rem 0.1rem;
   text-align: center;
   white-space: nowrap;
 }
 
+/* Column widths for the fixed layout above -- sized so the widest
+   realistic content (longest client/type label, an 8-figure amount)
+   fits without pushing the table past 100%, while the two free-text
+   columns (Client, Libellé/Détail) get most of the remaining room.
+   Every column is a percentage (including actions-col/Date above,
+   deliberately not rem) -- mixing units meant the rem columns' pixel
+   width was added *on top of* the percentage budget instead of coming
+   out of it, silently pushing the table a few pixels past 100% and
+   reintroducing the horizontal scrollbar this is meant to avoid.
+   Percentages intentionally sum to a little under 100%: table-layout:
+   fixed treats them as relative weights, not a hard budget, so slightly
+   under leaves headroom rather than risking every column getting
+   scaled down to fit. */
+#figli-home-app th:nth-child(2),
+#figli-home-app td:nth-child(2) {
+  width: 6%;
+  white-space: nowrap;
+}
+#figli-home-app th:nth-child(3),
+#figli-home-app td:nth-child(3) {
+  width: 10%;
+}
+#figli-home-app th:nth-child(4),
+#figli-home-app td:nth-child(4) {
+  width: 7%;
+}
+#figli-home-app th:nth-child(5),
+#figli-home-app td:nth-child(5) {
+  width: 5.5%;
+  white-space: nowrap;
+}
+#figli-home-app .amount:not(.compte-col) {
+  width: 5.5%;
+  white-space: nowrap;
+}
+#figli-home-app .amount.compte-col {
+  width: 3.5%;
+  white-space: nowrap;
+}
+
 /* Buttons stay inline (not flex) inside the <td> -- display: flex on a
    table cell breaks the table's own column-width calculation (observed:
    a ~55px gap opening up between this column and the next, and the

web/modules/custom/figli_compta_ledger/templates/figli-compta-home.html.twig

@@ -250,8 +250,7 @@
       <tfoot>
         <tr class="figli-totals-row">
           <td class="actions-col"></td>
-          <td class="actions-col"></td>
-          <td colspan="5">
+          <td colspan="6">
             Solde {{ currentYear || '…' }} (créditeur / débiteur)
             <span v-if="currentYearLoading" class="figli-note">chargement…</span>
           </td>