fix: rework wallet deletion per review feedback

- Remove all red/danger styling, use standard monochrome colors
- Add wallet picker dropdown so user can select which wallet to delete
- Fix encryptedSecret field name (was wallet.encrypted)
- Populate dropdown when settings view opens
- Confirmation modal uses standard border styling

src/popup/index.html

@@ -842,9 +842,26 @@
                     <div id="settings-denied-sites"></div>
                 </div>
 
+                <div class="border-t border-border-light pt-3 mt-3">
+                    <h3 class="font-bold mb-2">Delete wallet</h3>
+                    <label class="block text-xs text-muted mb-1"
+                        >Select wallet to delete:</label
+                    >
+                    <select
+                        id="delete-wallet-select"
+                        class="border border-border p-1 w-full text-sm bg-bg text-fg mb-2"
+                    ></select>
+                    <button
+                        id="btn-delete-wallet"
+                        class="border border-border px-2 py-1 hover:bg-fg hover:text-bg cursor-pointer"
+                    >
+                        Delete...
+                    </button>
+                </div>
+
                 <div
                     id="delete-wallet-confirm"
-                    class="hidden bg-well p-3 mx-1 mb-3 border border-dashed border-border"
+                    class="hidden border border-border border-dashed p-3 mt-2 mb-3"
                 >
                     <h3 class="font-bold mb-1">Confirm Deletion</h3>
                     <p class="text-xs text-muted mb-2">