fix: parse ollama cloud cost-based usage windows and credits balance (#3381)

Ollama Cloud's /settings page switched shapes for cost-based plans: parse
the 'Monthly usage $X of $Y used' row as a monthly window with a symmetric
'$X / $Y' money label that reads correctly in both used/remaining display
modes, and surface the Extra usage credits balance as a balance-only
credits_balance window matching the Codex/DeepSeek credits treatment
('Credits Balance' in the UI), omitted when the balance is $0. The VS Code
credential validation accepts the new page shape and the Settings cookie
placeholder shows the two-cookie format. Web and VS Code parsers kept in
sync per quota DOCUMENTATION.md.

packages/vscode/src/quotaProviders.ts

@@ -1899,6 +1899,39 @@ const parseOllamaSettingsHtml = (html: string) => {
     });
   }
 
+  // Cost-based plans render "Monthly usage" with a dollar amount instead of
+  // session/weekly/premium windows; support both page shapes.
+  const monthlyMatch = html.match(/Monthly\s+usage[\s\S]{0,200}?\$([0-9][0-9,.]*)\s+of\s+\$([0-9][0-9,.]*)/i);
+  if (monthlyMatch) {
+    const used = toNumber(monthlyMatch[1].replace(/,/g, ''));
+    const total = toNumber(monthlyMatch[2].replace(/,/g, ''));
+    const usedPercent = total && used !== null ? Math.min(100, (used / total) * 100) : null;
+    windows.monthly = toUsageWindow({
+      usedPercent,
+      windowSeconds: null,
+      resetAt: null,
+      valueLabel: `$${monthlyMatch[1]} / $${monthlyMatch[2]}`,
+    });
+  }
+
+  // "Extra usage" credits block (visible when credits/auto-reload is enabled):
+  // a balance, not a percent. Anchor on "Balance remaining" — nearby "Add $5"
+  // and auto-reload copy also contain dollar amounts. Surfaced with the
+  // credits_balance key and OpenAI-style plain money label (the UI renders
+  // it as "Credits Balance"); a $0 balance is omitted rather than shown.
+  const balanceMatch = html.match(/Balance\s+remaining[\s\S]{0,200}?\$([0-9][0-9,.]*)/i);
+  if (balanceMatch) {
+    const balance = toNumber(balanceMatch[1].replace(/,/g, ''));
+    if (balance !== 0) {
+      windows.credits_balance = toUsageWindow({
+        usedPercent: null,
+        windowSeconds: null,
+        resetAt: null,
+        valueLabel: `$${balanceMatch[1]}`,
+      });
+    }
+  }
+
   return windows;
 };