fix: Net Worth defaults to 5y, Dashboard->Transactions keeps month/year

Net Worth opened on a 30-day window by default, which frequently shows
a dip (short windows don't have enough recorded income relative to
spending) even though the long-term trend is a steady climb —
demotivating for no good reason. Defaults to 5y instead.

Dashboard's "All transactions" link always sent users to the current
month regardless of which month they had selected. It now carries
?year=&month= and TransactionsPage seeds its state from those params
(clamped/validated, falls back to the current month if absent).

frontend/package.json

@@ -1,7 +1,7 @@
 {
   "name": "aurum-frontend",
   "private": true,
-  "version": "0.17.0",
+  "version": "0.17.1",
   "type": "module",
   "scripts": {
     "dev": "vite",