improvement(emails): align transactional emails with the platform neutral design system (#5309)

* improvement(emails): align transactional emails with the platform neutral design system

Re-skin all ~25 transactional email templates to match the platform/newsletter:
- Color tokens in _styles/base.ts now mirror globals.css light mode (#fefefe canvas,
  #1a1a1a text, #525252/#5c5c5c/#707070 greys, #dedede border) instead of the old
  lavender + green (#33C482) scheme; accent defaults to neutral #1a1a1a but still
  honors a whitelabel primaryColor.
- Primary CTA now matches the platform's primary Chip (inverse #1a1a1a fill, white
  text, rounded-lg, text-sm, normal weight); links carry an underline since the
  neutral color no longer signals a link.
- Card uses 8px radius + hairline border; info/code boxes use a subtle token fill.
- Logo is the dark, text-only 'sim' wordmark (green icon removed).
- Footer: LinkedIn replaces Discord.
- Every template routes through the centralized colors tokens — zero hardcoded hex
  (payment-failed error box tokenized to platform error surface values).

* fix(emails): keep card boundary robust + don't reshape custom logos

- Canvas goes to #f8f8f8 (off Andres's newsletter) so the white card reads via
  contrast in clients that flatten inline borders, not the border alone (Greptile P2).
- Logo pins exact 70x34 only for the bundled wordmark; whitelabel brand.logoUrl now
  constrains by height with auto width so custom logos keep their aspect (Greptile P1).

* improvement(emails): use Season Sans to match the newsletter and platform

Register the Season Sans web font (the woff2 shipped with the newsletter, #5302)
via react-email's <Font> in the layout head, and lead the email font stack with
'Season Sans' (system stack still the fallback for clients that ignore @font-face).

apps/sim/components/emails/_styles/base.ts

@@ -10,30 +10,36 @@ function buildColors() {
   const brand = getBrandConfig()
   const isWhitelabeled = brand.isWhitelabeled
   const accentColor =
-    isWhitelabeled && brand.theme?.primaryColor ? brand.theme.primaryColor : '#33C482'
+    isWhitelabeled && brand.theme?.primaryColor ? brand.theme.primaryColor : '#1a1a1a'
 
   return {
-    /** Main canvas background */
-    bgOuter: '#F7F9FC',
-    /** Card/container background - pure white */
+    /** Main canvas background — a hair off-white so the white card reads via contrast, not the border alone */
+    bgOuter: '#f8f8f8',
+    /** Card/container background — platform `--surface-2` */
     bgCard: '#ffffff',
-    /** Primary text color */
-    textPrimary: '#2d2d2d',
-    /** Secondary text color */
-    textSecondary: '#404040',
-    /** Tertiary text color */
+    /** Primary text — platform `--text-primary` */
+    textPrimary: '#1a1a1a',
+    /** Secondary text — platform `--text-secondary` */
+    textSecondary: '#525252',
+    /** Tertiary text — platform `--text-tertiary` */
     textTertiary: '#5c5c5c',
-    /** Muted text (footer) */
-    textMuted: '#737373',
-    /** Brand primary color */
+    /** Muted text (footer) — platform `--text-muted` */
+    textMuted: '#707070',
+    /** Brand primary — neutral by default, brand color when whitelabeled */
     brandPrimary:
-      isWhitelabeled && brand.theme?.primaryColor ? brand.theme.primaryColor : '#33C482',
-    /** Brand accent - used for buttons and links */
+      isWhitelabeled && brand.theme?.primaryColor ? brand.theme.primaryColor : '#1a1a1a',
+    /** Accent for buttons and links — neutral by default, brand color when whitelabeled */
     brandTertiary: accentColor,
-    /** Border/divider color */
-    divider: '#ededed',
-    /** Footer background */
-    footerBg: '#F7F9FC',
+    /** Border/divider — platform `--border` */
+    divider: '#dedede',
+    /** Subtle fill for info/code boxes on the white card */
+    surfaceSubtle: '#f7f7f7',
+    /** Error surface fill — platform `--terminal-status-error-bg` */
+    errorBg: '#fef2f2',
+    /** Error surface border — platform `--error-muted` */
+    errorBorder: '#fecaca',
+    /** Footer background — matches the canvas */
+    footerBg: '#f8f8f8',
   }
 }
 
@@ -41,7 +47,8 @@ export const colors = buildColors()
 
 /** Typography settings */
 export const typography = {
-  fontFamily: "-apple-system, 'SF Pro Display', 'SF Pro Text', 'Helvetica', sans-serif",
+  fontFamily:
+    "'Season Sans', -apple-system, 'SF Pro Display', 'SF Pro Text', 'Helvetica', sans-serif",
   fontSize: {
     body: '16px',
     small: '14px',
@@ -79,12 +86,13 @@ export const baseStyles = {
     margin: '0 auto',
   },
 
-  /** Main card container with rounded corners */
+  /** Main card container — white surface, chip-radius, hairline border on the near-white canvas */
   container: {
     maxWidth: `${spacing.containerWidth}px`,
     margin: '0 auto',
     backgroundColor: colors.bgCard,
-    borderRadius: '16px',
+    border: `1px solid ${colors.divider}`,
+    borderRadius: '8px',
     overflow: 'hidden',
   },
 
@@ -120,26 +128,27 @@ export const baseStyles = {
     display: 'inline',
   },
 
-  /** Primary CTA button - matches app tertiary button style */
+  /** Primary CTA button - matches the platform's primary Chip (inverse fill, rounded-lg, h-30, text-sm) */
   button: {
     display: 'inline-block',
     backgroundColor: colors.brandTertiary,
     color: '#ffffff',
-    fontWeight: 500,
+    fontWeight: 400,
     fontSize: '14px',
-    padding: '6px 12px',
-    borderRadius: '5px',
+    lineHeight: '30px',
+    padding: '0 12px',
+    borderRadius: '8px',
     textDecoration: 'none',
     textAlign: 'center' as const,
     margin: '4px 0',
     fontFamily: typography.fontFamily,
   },
 
-  /** Link text style */
+  /** Link text style - neutral color, so it carries an underline to read as a link */
   link: {
     color: colors.brandTertiary,
-    fontWeight: 'bold' as const,
-    textDecoration: 'none',
+    fontWeight: 400,
+    textDecoration: 'underline',
   },
 
   /** Horizontal divider */
@@ -169,8 +178,8 @@ export const baseStyles = {
   codeContainer: {
     margin: '12px 0',
     padding: '12px 16px',
-    backgroundColor: '#f8f9fa',
-    borderRadius: '6px',
+    backgroundColor: colors.surfaceSubtle,
+    borderRadius: '8px',
     border: `1px solid ${colors.divider}`,
     textAlign: 'center' as const,
   },
@@ -198,9 +207,9 @@ export const baseStyles = {
 
   /** Highlighted info box (e.g., "What you get with Pro") */
   infoBox: {
-    backgroundColor: colors.bgOuter,
+    backgroundColor: colors.surfaceSubtle,
     padding: '16px 18px',
-    borderRadius: '6px',
+    borderRadius: '8px',
     margin: '16px 0',
   },
 

apps/sim/components/emails/billing/credits-exhausted-email.tsx

@@ -34,7 +34,7 @@ export function CreditsExhaustedEmail({
 
       <Section
         style={{
-          backgroundColor: '#f8faf9',
+          backgroundColor: colors.surfaceSubtle,
           border: `1px solid ${colors.brandTertiary}20`,
           borderRadius: '8px',
           padding: '16px 20px',

apps/sim/components/emails/billing/free-tier-upgrade-email.tsx

@@ -39,7 +39,7 @@ export function FreeTierUpgradeEmail({
       {/* Pro Features */}
       <Section
         style={{
-          backgroundColor: '#f8faf9',
+          backgroundColor: colors.surfaceSubtle,
           border: `1px solid ${colors.brandTertiary}20`,
           borderRadius: '8px',
           padding: '16px 20px',

apps/sim/components/emails/billing/payment-failed-email.tsx

@@ -48,8 +48,8 @@ export function PaymentFailedEmail({
 
       <Section
         style={{
-          backgroundColor: '#fff5f5',
-          border: '1px solid #fed7d7',
+          backgroundColor: colors.errorBg,
+          border: `1px solid ${colors.errorBorder}`,
           borderRadius: '6px',
           padding: '16px 18px',
           margin: '16px 0',

apps/sim/components/emails/components/email-footer.tsx

@@ -81,12 +81,15 @@ export function EmailFooter({
                             </Link>
                           </td>
                           <td align='left' style={{ padding: '0 8px' }}>
-                            <Link href={`${baseUrl}/discord`} rel='noopener noreferrer'>
+                            <Link
+                              href='https://www.linkedin.com/company/simdotai'
+                              rel='noopener noreferrer'
+                            >
                               <Img
-                                src={`${baseUrl}/static/discord-icon.png`}
+                                src={`${baseUrl}/static/linkedin-icon.png`}
                                 width='20'
                                 height='20'
-                                alt='Discord'
+                                alt='LinkedIn'
                               />
                             </Link>
                           </td>

apps/sim/components/emails/components/email-layout.tsx

@@ -1,4 +1,4 @@
-import { Body, Container, Head, Html, Img, Preview, Section } from '@react-email/components'
+import { Body, Container, Font, Head, Html, Img, Preview, Section } from '@react-email/components'
 import { baseStyles } from '@/components/emails/_styles'
 import { EmailFooter } from '@/components/emails/components/email-footer'
 import { getBaseUrl } from '@/lib/core/utils/urls'
@@ -30,10 +30,22 @@ export function EmailLayout({
 }: EmailLayoutProps) {
   const brand = getBrandConfig()
   const baseUrl = getBaseUrl()
+  const hasCustomLogo = Boolean(brand.logoUrl)
 
   return (
     <Html>
-      <Head />
+      <Head>
+        <Font
+          fontFamily='Season Sans'
+          fallbackFontFamily={['Helvetica', 'sans-serif']}
+          webFont={{
+            url: `${baseUrl}/brand/fonts/SeasonSansUprightsVF.woff2`,
+            format: 'woff2',
+          }}
+          fontWeight='300 800'
+          fontStyle='normal'
+        />
+      </Head>
       <Preview>{preview}</Preview>
       <Body style={baseStyles.main}>
         {/* Main card container */}
@@ -42,10 +54,10 @@ export function EmailLayout({
           <Section style={baseStyles.header}>
             <Img
               src={brand.logoUrl || `${baseUrl}/brand/color/email/wordmark.png`}
-              width='107'
-              height='33'
+              height='34'
+              {...(hasCustomLogo ? {} : { width: '70' })}
               alt={brand.name}
-              style={{ display: 'block' }}
+              style={hasCustomLogo ? { display: 'block', width: 'auto' } : { display: 'block' }}
             />
           </Section>