Added multi-currency support, account/budget management, and settings

- Primary account determines app-wide reference currency; all totals, charts, and summaries convert to it automatically using live rates

- Transactions show both converted and original amounts for cross-currency accounts; IsMultiCurrency recalculates on primary currency change

- Exchange rates fetched live on account save and broadcast via RatesRefreshed so all views update without a restart

- Account create/edit/delete with currency, icon, color, and primary toggle

- Budget create/edit/delete; savings goal dialog

- Settings view: display name, avatar upload, theme, language

- Removed currency selector from Settings (follows primary account)

- Fixed account list sort: primary first, then oldest CreatedAt, per group

- Fixed total balance overlap in dashboard accounts card

.claude/settings.local.json

@@ -0,0 +1,10 @@
+{
+  "permissions": {
+    "allow": [
+      "WebFetch(domain:raw.githubusercontent.com)",
+      "Bash(chmod +x \"/c/Users/Nouredeen/.claude/scripts/context-bar.sh\")",
+      "Bash(dotnet build:*)"
+    ]
+  },
+  "spinnerTipsEnabled": true
+}