fix(chat-input): stop template dialogs from sending and fix attachment races

- Template dialogs no longer submit the outer chat form
- Sending is blocked while files or URLs are still extracting
- File and URL extraction no longer drop or resurrect entries
- IME composition Enter no longer sends
- Tool call cards show the error text; keyboard handling on cards fixed
- Template import available when empty, edit dialog resets, saved templates refresh
- Only png/jpeg/gif/webp images accepted, SVG sent as text; PDF objects released
- parse-url request sends the access code

tests/unit/url-utils.test.ts

@@ -0,0 +1,25 @@
+import { afterEach, describe, expect, it, vi } from "vitest"
+import { STORAGE_KEYS } from "@/lib/storage"
+import { extractUrlContent } from "@/lib/url-utils"
+
+describe("extractUrlContent", () => {
+    afterEach(() => {
+        vi.unstubAllGlobals()
+        localStorage.clear()
+    })
+
+    it("sends the saved access code with the request", async () => {
+        localStorage.setItem(STORAGE_KEYS.accessCode, "secret")
+        const body = { title: "T", content: "body", charCount: 4 }
+        const fetchMock = vi
+            .fn()
+            .mockResolvedValue(new Response(JSON.stringify(body)))
+        vi.stubGlobal("fetch", fetchMock)
+
+        const data = await extractUrlContent("https://example.com")
+
+        expect(data.content).toBe("body")
+        const headers = fetchMock.mock.calls[0][1].headers
+        expect(headers["x-access-code"]).toBe("secret")
+    })
+})