fix: differentiate cache label from cache size label in TaskHeader

- Added new translation key "cacheSize" for cache size display
- Updated TaskHeader.tsx to use "cacheSize" key for byte size display
- Kept original "cache" key for token metrics display
- Updated all language translation files with appropriate translations

This resolves the UI confusion where two different metrics both showed "Cache" as their label.

Author: roomote

webview-ui/src/components/chat/TaskHeader.tsx

@@ -269,7 +269,7 @@ const TaskHeader = ({
 										(typeof cacheWrites === "number" && cacheWrites > 0)) && (
 										<tr>
 											<th className="font-bold text-left align-top w-1 whitespace-nowrap pl-1 pr-3 h-[24px]">
-												{t("chat:task.cache")}
+												{t("chat:task.cacheSize")}
 											</th>
 											<td className="align-top">
 												{prettyBytes(((cacheReads || 0) + (cacheWrites || 0)) * 4)}

webview-ui/src/i18n/locales/ca/chat.json

@@ -8,6 +8,7 @@
 		"seeLess": "See less",
 		"tokens": "Tokens",
 		"cache": "Cache",
+		"cacheSize": "Cache Size",
 		"apiCost": "API Cost",
 		"size": "Size",
 		"condenseContext": "Intelligently condense context",