fix(web): compact model availability warning (#2857)

docs/specs/no-silent-model-fallback/spec.md

@@ -368,8 +368,11 @@ judges added lines even in unmigrated files.
 This difference is advisory only.
 
 - Every profile remains selectable.
-- A missing host model shows an amber warning and visible secondary text.
-- The warning says that the executor decides availability at launch.
+- A missing host model shows one amber warning icon beside the profile name.
+- On fine pointers, hovering or focusing the warning icon reveals the full
+  localized advisory that the executor decides availability at launch. On
+  coarse pointers, tapping the icon opens the same advisory in a drawer. The
+  advisory is not shown as an always-visible secondary row in the option list.
 - The warning does not promise that an explicit fallback will be available.
 - The warning does not change the saved profile model.
 
@@ -439,7 +442,8 @@ E2E (Playwright, `apps/web/e2e`):
 
 - Mock backend (`KANDEV_E2E_MOCK=true`): create a profile whose start model
   is not in the host catalog. Make sure that the task-create picker keeps the
-  profile selectable and shows the advisory warning.
+  profile selectable, shows one warning icon, and reveals the advisory warning
+  through the fine-pointer tooltip or coarse-pointer drawer.
 - Launch with an executor catalog that omits the profile model. Make sure that
   no model-selection call occurs, the task continues, and chat shows one warning.
 - Reload the task page. Make sure that the warning remains in chat.