feat(plugin): multi-line text input via ui.input-multiline (#1968)

* feat(plugin): multi-line text input via ui.input-multiline

Adds host::input_multiline: a multi-line text dialog pre-filled with a
value, dismissed to none, confirmed with Cmd/Ctrl+Enter. Same rules as
input (command or event of a window, no capability, wait not charged).

Prompt::Input gains a multiline flag the frontend renders as a
textarea; the jobs fixture, SDK (wasm + mock), WIT and the plugin API
table are updated, and all plugin wasms rebuilt.

Fixes #1946

* chore: regenerate bindings after merging detail-provider rename

src/workbench/inputDialogs.module.css

@@ -32,3 +32,31 @@
 .activeRow {
   color: var(--fg-strong);
 }
+.area {
+  resize: vertical;
+  min-height: 60px;
+  max-height: 240px;
+  padding: 4px 8px;
+  border: 0;
+  border-radius: var(--radius-control, 4px);
+  background: var(--bg-field, var(--bg-button));
+  box-shadow: inset 0 0 0 1px var(--border-button);
+  color: var(--fg-strong);
+  font-family: inherit;
+  font-size: var(--fs-ui);
+  line-height: 20px;
+  outline: none;
+}
+.area:focus {
+  box-shadow:
+    inset 0 0 0 1px var(--focus-ring),
+    0 0 0 1px var(--focus-ring);
+}
+.area[aria-invalid="true"] {
+  box-shadow:
+    inset 0 0 0 1px var(--danger),
+    0 0 0 1px var(--danger);
+}
+.area::placeholder {
+  color: var(--fg-faint);
+}