Add frontend autoformatting and set CI to require formatted code for all languages (#6052)

# Description of Changes
Changes the strategy for autoformatting to reject PRs if they are not
formatted correctly instead of allowing them to merge and then spawning
a new PR to fix the formatting. The old strategy just caused more work
for us because we'd have to manually approve the followup PR and get it
merged, which required 2 reviewers so in practice it rarely got done and
just meant everyone's PRs ended up containing reformatting for unrelated
files, which makes code review unnecessarily difficult. If the PR's code
is not formatted correctly after this PR, a comment will be added
automatically to tell the author how to run the formatter script to fix
their code so it can go in.

This also enables autoformatting for the frontend code, using Prettier.
I've enabled it for pretty much everything in the frontend folder, other
than 3rd party files and files it doesn't make sense for. I also
excluded Markdown because it sounds likely to be more annoying to have
to autoformat the Markdown in the frontend folder but nowhere else. Open
to changing this though if people disagree.

> [!note]
> 
> Advice to reviewers: The first commit contains all of the actual logic
I've introduced (CI changes, Prettier config, etc.)
> The second commit is just the reformatting of the entire frontend
folder.
> The first commit needs proper review, the second one just give it a
spot-check that it's doing what you'd expect.

frontend/src/desktop/components/shared/config/configSections/plan/UsageDisplay.tsx

@@ -1,13 +1,13 @@
-import React from 'react';
-import { Card, Text, Stack, Group, Progress, Alert } from '@mantine/core';
-import InfoOutlinedIcon from '@mui/icons-material/InfoOutlined';
-import { useTranslation } from 'react-i18next';
-import type { BillingStatus } from '@app/services/saasBillingService';
-import { BILLING_CONFIG, getFormattedOveragePrice } from '@app/config/billing';
+import React from "react";
+import { Card, Text, Stack, Group, Progress, Alert } from "@mantine/core";
+import InfoOutlinedIcon from "@mui/icons-material/InfoOutlined";
+import { useTranslation } from "react-i18next";
+import type { BillingStatus } from "@app/services/saasBillingService";
+import { BILLING_CONFIG, getFormattedOveragePrice } from "@app/config/billing";
 
 interface UsageDisplayProps {
-  tier: BillingStatus['tier'];
-  usage: BillingStatus['meterUsage'];
+  tier: BillingStatus["tier"];
+  usage: BillingStatus["meterUsage"];
 }
 
 export function UsageDisplay({ tier, usage }: UsageDisplayProps) {
@@ -16,11 +16,11 @@ export function UsageDisplay({ tier, usage }: UsageDisplayProps) {
   // Credits per month based on tier
   const getMonthlyCredits = (): number => {
     switch (tier) {
-      case 'free':
+      case "free":
         return BILLING_CONFIG.FREE_CREDITS_PER_MONTH;
-      case 'team':
+      case "team":
         return BILLING_CONFIG.INCLUDED_CREDITS_PER_MONTH;
-      case 'enterprise':
+      case "enterprise":
         return 1000; // Placeholder — enterprise credits are custom
       default:
         return BILLING_CONFIG.FREE_CREDITS_PER_MONTH;
@@ -39,13 +39,13 @@ export function UsageDisplay({ tier, usage }: UsageDisplayProps) {
       <Stack gap="md">
         {/* Header */}
         <Text size="lg" fw={600}>
-          {t('settings.planBilling.credits.title', 'Credit Usage')}
+          {t("settings.planBilling.credits.title", "Credit Usage")}
         </Text>
 
         {/* Monthly credits info */}
         <Group justify="space-between">
           <Text size="sm" c="dimmed">
-            {t('settings.planBilling.credits.included', {
+            {t("settings.planBilling.credits.included", {
               count: monthlyCredits,
               defaultValue: `${monthlyCredits} credits/month (included)`,
             })}
@@ -58,13 +58,13 @@ export function UsageDisplay({ tier, usage }: UsageDisplayProps) {
             <Stack gap="xs">
               <Group justify="space-between">
                 <Text size="sm" c="dimmed">
-                  {t('settings.planBilling.credits.overage', {
+                  {t("settings.planBilling.credits.overage", {
                     count: usage.currentPeriodCredits,
                     defaultValue: `+ ${usage.currentPeriodCredits} overage`,
                   })}
                 </Text>
                 <Text size="sm" fw={500} c="orange">
-                  {t('settings.planBilling.credits.estimatedCost', {
+                  {t("settings.planBilling.credits.estimatedCost", {
                     amount: formatCurrency(usage.estimatedCost),
                     defaultValue: `Estimated cost: ${formatCurrency(usage.estimatedCost)}`,
                   })}
@@ -72,19 +72,12 @@ export function UsageDisplay({ tier, usage }: UsageDisplayProps) {
               </Group>
 
               {/* Progress bar for overage usage */}
-              <Progress
-                value={100}
-                color="orange"
-                size="sm"
-                radius="xl"
-                striped
-                animated
-              />
+              <Progress value={100} color="orange" size="sm" radius="xl" striped animated />
             </Stack>
 
             <Alert color="blue" variant="light" icon={<InfoOutlinedIcon sx={{ fontSize: 16 }} />}>
               <Text size="xs">
-                {t('settings.planBilling.credits.overageInfo', {
+                {t("settings.planBilling.credits.overageInfo", {
                   price: getFormattedOveragePrice(),
                   defaultValue: `Overage credits are billed at ${getFormattedOveragePrice()} per credit. You'll only pay for what you use beyond your monthly allowance.`,
                 })}
@@ -94,10 +87,10 @@ export function UsageDisplay({ tier, usage }: UsageDisplayProps) {
         )}
 
         {/* No overage message */}
-        {(!usage || usage.currentPeriodCredits === 0) && tier !== 'free' && (
+        {(!usage || usage.currentPeriodCredits === 0) && tier !== "free" && (
           <Alert color="green" variant="light">
             <Text size="sm">
-              {t('settings.planBilling.credits.noOverage', {
+              {t("settings.planBilling.credits.noOverage", {
                 count: monthlyCredits,
                 defaultValue: `No overage charges this month. You're using your included ${monthlyCredits} credits.`,
               })}
@@ -106,10 +99,10 @@ export function UsageDisplay({ tier, usage }: UsageDisplayProps) {
         )}
 
         {/* Free tier message */}
-        {tier === 'free' && (
+        {tier === "free" && (
           <Alert color="blue" variant="light">
             <Text size="sm">
-              {t('settings.planBilling.credits.freeTierInfo', {
+              {t("settings.planBilling.credits.freeTierInfo", {
                 freeCredits: BILLING_CONFIG.FREE_CREDITS_PER_MONTH,
                 teamCredits: BILLING_CONFIG.INCLUDED_CREDITS_PER_MONTH,
                 defaultValue: `Free plan includes ${BILLING_CONFIG.FREE_CREDITS_PER_MONTH} credits per month. Upgrade to Team for ${BILLING_CONFIG.INCLUDED_CREDITS_PER_MONTH} credits/month and pay-as-you-go overage billing.`,