feat: garden containers crud (task 71)

- add listContainers/getContainer/searchContainers queries
- add createContainer/updateContainer/deleteContainer server actions with logActivity
- add ContainerList, ContainerDetail, ContainerForm client components
- add /garden, /garden/containers/[id], /garden/containers/new pages
- register garden.container entity with share + search in manifest
- add sprout icon to NavIcon registry
- add garden e2e test spec

tests/e2e/garden.spec.ts

@@ -0,0 +1,31 @@
+import { test, expect } from "@playwright/test";
+
+test("garden containers happy path", async ({ page }) => {
+  await page.goto("/garden");
+  await expect(page.getByRole("heading", { name: "Garden" })).toBeVisible();
+
+  // Create a container
+  await page.getByRole("button", { name: /new container/i }).click();
+  await page.getByLabel("Name").fill("Living Room Shelf");
+  await page.getByLabel("Type").selectOption("shelf");
+  await page.getByRole("button", { name: /save|create/i }).click();
+
+  // Verify it appears in the list
+  await expect(page.getByText("Living Room Shelf")).toBeVisible();
+
+  // Open the container detail
+  await page.getByText("Living Room Shelf").click();
+  await expect(page.getByRole("heading", { name: "Living Room Shelf" })).toBeVisible();
+
+  // Edit the container
+  await page.getByRole("button", { name: /edit/i }).click();
+  await page.getByLabel("Name").fill("Living Room Shelf (Updated)");
+  await page.getByRole("button", { name: /save/i }).click();
+  await expect(page.getByRole("heading", { name: "Living Room Shelf (Updated)" })).toBeVisible();
+
+  // Delete the container
+  await page.getByRole("button", { name: /delete/i }).click();
+  await page.getByRole("button", { name: /confirm|yes/i }).click();
+  await expect(page).toHaveURL(/\/garden/);
+  await expect(page.getByText("Living Room Shelf")).toBeHidden();
+});