fix: resolve linting issues in memory system

- Add key to #each block in MemoryBrowserPanel (ESLint)
- Replace .last() with .next_back() for better performance (Clippy)
- Format files with Prettier

Co-Authored-By: Hikari <hikari@nhcarrigan.com>

src-tauri/capabilities/default.json

@@ -30,15 +30,11 @@
     },
     {
       "identifier": "fs:scope",
-      "allow": [
-        { "path": "$HOME/.claude/**" }
-      ]
+      "allow": [{ "path": "$HOME/.claude/**" }]
     },
     {
       "identifier": "fs:allow-read-text-file",
-      "allow": [
-        { "path": "$HOME/.claude/**" }
-      ]
+      "allow": [{ "path": "$HOME/.claude/**" }]
     },
     "core:window:allow-set-size",
     "core:window:allow-set-always-on-top",