fix: handle NaN percentage values and rename opus to sonnet

- Show 'N/A' and dim card when percentage is NaN/invalid
- Use gray progress bar for invalid values
- Rename opusWeekly* properties to sonnetWeekly* to match server types

apps/ui/src/lib/electron.ts

@@ -898,9 +898,9 @@ const getMockElectronAPI = (): ElectronAPI => {
           weeklyPercentage: 5,
           weeklyResetTime: new Date(Date.now() + 86400000 * 2).toISOString(),
           weeklyResetText: "Resets Dec 23",
-          opusWeeklyTokensUsed: 0,
-          opusWeeklyPercentage: 1,
-          opusResetText: "Resets Dec 27",
+          sonnetWeeklyTokensUsed: 0,
+          sonnetWeeklyPercentage: 1,
+          sonnetResetText: "Resets Dec 27",
           costUsed: null,
           costLimit: null,
           costCurrency: null,