Add release channel selector components, subject autocomplete, and related tests

- Implement components for `ReleaseChannelSelector`, including panel and sidebar variants.
- Add `ReleaseAssignmentSubjectAutocomplete` for user, subuser, and customer search functionality.
- Update i18n phrases for channel selector and subject assignment.
- Enhance unit and E2E tests for release channel availability, switching, and runtime configuration.
- Modify modules for channel-related state handling and runtime refresh mechanics.

tests/e2e/release-channel-unavailable.spec.js

@@ -17,15 +17,11 @@ const unavailableRuntime = {
     description: "Early production validation before broader rollout.",
     enabled: true,
     default_channel: false,
-    frontend_base_url: null,
-    api_base_url: null,
   },
-  versions: { frontend: null, api: null },
-  frontend_base_url: null,
-  api_base_url: null,
+  versions: { frontend: null, api: null, bundle_id: null },
   availability: {
     configured: false,
-    missing: ["frontend_base_url", "api_base_url"],
+    missing: ["release_bundle", "frontend_version", "api_version"],
     status: "unconfigured",
   },
   capture_policy: {
@@ -36,15 +32,13 @@ const unavailableRuntime = {
   },
 };
 
-const availableRuntime = (frontendBaseUrl) => ({
+const availableRuntime = () => ({
   ...unavailableRuntime,
-  channel: {
-    ...unavailableRuntime.channel,
-    frontend_base_url: frontendBaseUrl,
-    api_base_url: "https://api-canary.example.test",
+  versions: {
+    frontend: { version_label: "frontend-canary", commit_sha: "c0ffee" },
+    api: { version_label: "api-canary", commit_sha: "feedface" },
+    bundle_id: 31,
   },
-  frontend_base_url: frontendBaseUrl,
-  api_base_url: "https://api-canary.example.test",
   availability: {
     configured: true,
     missing: [],
@@ -81,8 +75,9 @@ test("users assigned to an unconfigured release channel can ignore the guard tem
   await expect(guard).toBeVisible();
   await expect(guard).toContainText("Release channel is not ready");
   await expect(guard).toContainText("Canary");
-  await expect(page.getByTestId("release-channel-missing")).toContainText("Frontend URL");
-  await expect(page.getByTestId("release-channel-missing")).toContainText("API URL");
+  await expect(page.getByTestId("release-channel-missing")).toContainText("Release bundle");
+  await expect(page.getByTestId("release-channel-missing")).toContainText("Frontend version");
+  await expect(page.getByTestId("release-channel-missing")).toContainText("API version");
   await expect(page.getByTestId("release-channel-next-check")).toContainText("Checking again in");
 
   await page.getByTestId("release-channel-ignore").click();
@@ -129,7 +124,9 @@ test("users assigned to an unconfigured release channel can check again when it
   const guard = page.getByTestId("release-channel-unavailable-page");
   await expect(guard).toBeVisible();
 
-  releaseRuntime = availableRuntime(new URL(page.url()).origin);
+  const currentUrl = page.url();
+  releaseRuntime = availableRuntime();
   await page.getByTestId("release-channel-check-again").click();
   await expect(guard).toHaveCount(0);
+  await expect(page).toHaveURL(currentUrl);
 });