fix: prevent layout shift when ComboBox dropdown opens inside modal

Two root causes of the shift were identified and fixed:

1. Melt UI's `usePopper` applies `position: absolute` to the dropdown
   via floating-ui after a `tick()` delay. During that one frame the
   `ul` was briefly in normal document flow, momentarily growing the
   `<dialog>` element and causing a reflow. Pre-setting
   `[data-melt-combobox-menu] { position: absolute }` in base.css
   removes the element from flow immediately at mount.

2. Melt UI's ComboBox has `preventScroll: true` by default. On open it
   calls `removeScroll()` which sets `body.overflow: hidden` and adds
   compensatory `padding-right` for the scrollbar width — a body
   reflow that shifts the dialog. Pre-setting `data-melt-scroll-lock`
   on the body in `modal.svelte` tells Melt UI the lock is already
   active so it returns early without touching the body.

Also fix `on:search` on `Input.ComboBox` (which the component never
dispatches) by replacing it with native `oninput`/`onfocusin` handlers
on the wrapper `<div>`, so typed text actually triggers debounced
server-side project search. Projects are now ordered newest-first
(`Query.orderDesc('')`) matching the org projects page.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/lib/components/modal.svelte

@@ -27,6 +27,16 @@
     $: if (error) {
         alert?.scrollIntoView({ behavior: 'smooth', block: 'start', inline: 'nearest' });
     }
+
+    // Melt UI's ComboBox (and other listbox-based components) call removeScroll()
+    // when they open, which adds overflow:hidden + compensatory padding-right
+    $: if (typeof document !== 'undefined') {
+        if (show) {
+            document.body.setAttribute('data-melt-scroll-lock', '');
+        } else {
+            document.body.removeAttribute('data-melt-scroll-lock');
+        }
+    }
 </script>
 
 <Form isModal {onSubmit}>

src/lib/profiles/css/base.css

@@ -4,3 +4,15 @@
     scrollbar-width: thin;
     position: relative;
 }
+
+/*
+ * Melt UI applies `position: absolute` to the combobox menu via floating-ui,
+ * but only after `tick()` — a one-frame delay. During that initial frame the
+ * menu is in the normal document flow, momentarily expanding any ancestor with
+ * `overflow: visible` (e.g. the <dialog> element) and causing a visible layout
+ * shift. Pre-setting `position: absolute` here removes the element from flow
+ * immediately at mount, so there is no reflow before floating-ui takes over.
+ */
+[data-melt-combobox-menu] {
+    position: absolute;
+}

src/routes/(console)/organization-[organization]/projectAccessSelector.svelte

@@ -35,6 +35,7 @@
         rowSearching[index] = true;
         const queries: string[] = [
             Query.limit(25),
+            Query.orderDesc(''),
             Query.equal('teamId', $organization.$id)
         ];
         if (search) {
@@ -83,7 +84,16 @@
 <Layout.Stack gap="s">
     {#each projectAccess as access, i}
         <Layout.Stack direction="row" gap="s" alignItems="flex-end">
-            <div style:flex="1">
+            <div
+                style:flex="1"
+                onfocusin={() => {
+                    if (!rowOptions[i]?.length) loadProjects(i);
+                }}
+                oninput={(e) => {
+                    if (e.target instanceof HTMLInputElement) {
+                        getDebouncedSearch(i)(e.target.value);
+                    }
+                }}>
                 <Input.ComboBox
                     id="project-{i}"
                     label={i === 0 ? 'Project' : ''}
@@ -91,9 +101,9 @@
                     placeholder="Search projects"
                     bind:value={access.projectId}
                     options={rowOptions[i] ?? []}
-                    noResultsOption={rowSearching[i] ? { disabled: true, message: 'Searching...' } : undefined}
-                    on:search={(e) => getDebouncedSearch(i)(e.detail)}
-                    on:focus={() => { if (!rowOptions[i]?.length) loadProjects(i); }} />
+                    noResultsOption={rowSearching[i]
+                        ? { disabled: true, message: 'Searching...' }
+                        : undefined} />
             </div>
             <div style:width="140px">
                 <InputSelect