content: fix donor guide privacy section — nonlogs.io link was on the wrong card

The nonlogs.io link previously sat on 'Skip the public receipt', a
behavioral tip with no relation to exchanges — clicking through led
somewhere the surrounding copy didn't explain. Looked up NonLogs (a
privacy-first exchange, no KYC/logs/account required, listed by the
Grin community for GRIN/USDT trading) and gave it its own card next to
'Acquire Grin without KYC', where it actually belongs. 'Skip the
public receipt' is now a plain tip with no dangling external link.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/lib/helpContent.ts

@@ -323,10 +323,14 @@ const DONOR_GUIDE_STRUCTURE: GuideBlockStructure[] = [
         href: 'https://bisq.network',
       },
       {
-        id: 'coinjoin',
-        chips: ['non-custodial', 'breaks history'],
+        id: 'noKycExchange',
+        chips: ['exchange', 'no KYC'],
         href: 'https://nonlogs.io',
       },
+      {
+        id: 'coinjoin',
+        chips: ['optional step', 'no proof needed'],
+      },
     ],
   },
   { kind: 'callout', id: 'consumerApps', variant: 'danger' },

src/locales/en.json

@@ -2358,6 +2358,10 @@
             "name": "Acquire Grin without KYC",
             "purpose": "Mine it, or buy it peer-to-peer through Bisq or a similar platform, so the coins aren't linked to your government ID in the first place."
           },
+          "noKycExchange": {
+            "name": "Buy through a no-KYC exchange",
+            "purpose": "NonLogs lists GRIN and doesn't ask for an ID, an account, or logs to trade — a lower-friction alternative to peer-to-peer if you'd rather use an exchange."
+          },
           "coinjoin": {
             "name": "Skip the public receipt",
             "purpose": "Publishing a payment proof links the donation to your Nostr identity. Don't publish it, and the donation stays between you and the campaign."