feat(browser): rework element annotation and picker toolbar

Element annotation is now free-text: dropped the Fix/Change/Question/
Approve intent pills and the intent field, so the user just says what
they want. The card uses the shared Button and is titled "Annotate
element".

Toolbar: the element picker and DevTools are no longer dev-gated and
work in prod; DevTools uses a wrench icon, and the old clipboard "grab"
is now a Camera "Screenshot element" tool. Each toolbar button
highlights only its own mode, and the copy toast reflects whether a
screenshot image was actually captured.

packages/app/src/i18n/resources/ja.ts

@@ -426,22 +426,17 @@ export const ja: TranslationResources = {
         enterUrl: "URLを入力",
         openDevTools: "ブラウザ開発ツールを開く",
         cancelSelector: "要素セレクターをキャンセル",
-        selectElement: "要素を選択",
-        grabElement: "要素をクリップボードにコピー",
-        grabElementLabel: "要素",
-        grabFailed: "要素をコピーできませんでした",
+        annotateElement: "要素に注釈を付ける",
+        screenshotElement: "要素のスクリーンショット",
+        screenshotCopied: "スクリーンショットをクリップボードにコピーしました",
+        elementCopied: "要素をクリップボードにコピーしました",
+        screenshotFailed: "スクリーンショットをコピーできませんでした",
       },
       annotate: {
-        title: "エージェントにフィードバックを送信",
-        placeholder: "変更すべき内容を記述…",
+        title: "要素に注釈を付ける",
+        placeholder: "この要素についてエージェントへのメッセージ…",
         submit: "添付",
         cancel: "キャンセル",
-        intents: {
-          fix: "修正",
-          change: "変更",
-          question: "質問",
-          approve: "承認",
-        },
       },
       devices: {
         label: "デバイスサイズ",