Add SaaS frontend code (#5879)

# Description of Changes
Adds the code for the SaaS frontend as proprietary code to the OSS repo.
This version of the code is adapted from 22/1/2026, which was the last
SaaS version based on the 'V2' design. This will move us closer to being
able to have the OSS products understand whether the user has a SaaS
account, and provide the correct UI in those cases.

frontend/public/locales/en-GB/translation.toml

@@ -142,6 +142,10 @@ welcome = "Welcome"
 white = "White"
 WorkInProgess = "Work in progress, May not work or be buggy, Please report any problems!"
 yes = "Yes"
+insufficientCredits = "Insufficient credits. Required: {{requiredCredits}}, Available: {{currentBalance}}, Shortfall: {{shortfall}}"
+loadingCredits = "Checking credits..."
+loadingProStatus = "Checking subscription status..."
+noticeTopUpOrPlan = "Not enough credits, please top up or upgrade to a plan"
 
 [account]
 accountSettings = "Account Settings"
@@ -2563,10 +2567,45 @@ title = "Quality Adjustment"
 tags = "squish,small,tiny"
 
 [config.account.overview]
+confirmDelete = "Delete My Account"
+deleteAccount = "Delete Account"
+deleteAccountTitle = "Delete Account"
+deleteFailed = "Failed to delete account."
+deleteFailedTitle = "Unable to delete account"
+deleteWarning = "This action is permanent and cannot be undone. All your data will be deleted."
+enterEmailConfirm = "To confirm deletion, please type your email address ({{email}}) below:"
 guestDescription = "You are signed in as a guest. Consider upgrading your account above."
+label = "Overview"
 manageAccountPreferences = "Manage your account preferences"
+signedInAs = "Signed in as"
 title = "Account Settings"
 
+[config.account.profilePicture]
+description = "Upload an image to personalize your account."
+help = "PNG, JPG, or WebP up to 2MB."
+remove = "Remove"
+sizeError = "Please select an image smaller than 2MB."
+switchedToCustom = "Switched to custom picture. You can now upload your own."
+title = "Profile picture"
+upload = "Upload"
+useCustom = "Use custom picture"
+usingProvider = "Using {{provider}} profile picture"
+
+[config.account.profilePicture.cropper]
+cropError = "Failed to crop image. Please try again."
+invalidImage = "Invalid image file. Please select a valid PNG, JPG, or WebP file."
+processing = "Processing crop..."
+save = "Save Cropped Image"
+sizeErrorAfterCrop = "Cropped image is too large. Please zoom out or crop a smaller area."
+title = "Crop Profile Picture"
+zoom = "Zoom"
+
+[config.account.security]
+changePassword = "Change password"
+description = "Manage your password and security settings."
+title = "Passwords & Security"
+update = "Update password"
+
 [config.account.upgrade]
 description = "Link your account to preserve your history and access more features!"
 email = "Email"
@@ -2580,9 +2619,13 @@ socialLogin = "Upgrade with Social Account"
 title = "Upgrade Guest Account"
 upgradeButton = "Upgrade Account"
 
+[config]
+plan = "Plan"
+
 [config.apiKeys]
 chartAriaLabel = "Credits usage: included {{includedUsed}} of {{includedTotal}}, purchased {{purchasedUsed}} of {{purchasedTotal}}"
 copyKeyAriaLabel = "Copy API key"
+creditsRemaining = "Credits Remaining"
 description = "Your API key for accessing Stirling's suite of PDF tools. Copy it to your project or refresh to generate a new one."
 docsDescription = "Learn more about integrating with Stirling PDF:"
 docsLink = "API Documentation"
@@ -3842,6 +3885,7 @@ version = "Version"
 accountCreatedSuccess = "Account created successfully! You can now sign in."
 alreadyLoggedIn = "You are already logged in to"
 alreadyLoggedIn2 = "devices. Please log out of the devices and try again."
+backToSignIn = "Back to sign in"
 cancel = "Cancel"
 changePasswordWarning = "Please change your password after logging in for the first time"
 credentialsUpdated = "Your credentials have been updated. Please sign in again."
@@ -3883,16 +3927,21 @@ or = "Or"
 password = "Password"
 passwordChangedSuccess = "Password changed successfully! Please sign in with your new password."
 passwordResetSent = "Password reset link sent to {{email}}! Check your email and follow the instructions."
+passwordUpdatedSuccess = "Your password has been updated successfully."
 pleaseEnterBoth = "Please enter both email and password"
 pleaseEnterEmail = "Please enter your email address"
 relyingPartyRegistrationNotFound = "No relying party registration found"
 rememberme = "Remember me"
+resetHelp = "Enter your email to receive a secure link to reset your password. If the link has expired, please request a new one."
+resetYourPassword = "Reset your password"
 saml2RequiresLicense = "SAML login requires an Enterprise license. Please contact the administrator to upgrade your plan."
 sending = "Sending…"
 sendMagicLink = "Send Magic Link"
+sendResetLink = "Send reset link"
 sessionExpired = "Your session has expired. Please sign in again."
 signin = "Sign in"
 signInAnonymously = "Sign Up as a Guest"
+subtitle = "Sign back in to Stirling PDF"
 signingIn = "Signing in..."
 signinTitle = "Please sign in"
 signInWith = "Sign in with"
@@ -3901,6 +3950,7 @@ ssoSignIn = "Login via Single Sign-on"
 title = "Sign in"
 toManySessions = "You have too many active sessions"
 unexpectedError = "Unexpected error: {{message}}"
+updatePassword = "Update password"
 useEmailInstead = "Login with email"
 useMagicLink = "Use magic link instead"
 userIsDisabled = "User is deactivated, login is currently blocked with this username. Please contact the administrator."
@@ -4210,6 +4260,15 @@ viewSwitcher = "Use these controls to select how you want to view your PDFs."
 workbench = "This is the <strong>Workbench</strong> - the main area where you view and edit your PDFs."
 wrapUp = "You're all set! You've learnt about the main areas of the app and how to use them. Click the <strong>Help</strong> button whenever you like to see this tour again."
 
+[onboarding.freeTrial]
+afterTrialWithoutPayment = "After your trial ends, you'll continue with our free tier. Add a payment method to keep Pro access."
+afterTrialWithPayment = "Your Pro subscription will start automatically when the trial ends."
+body = "You have full access to Stirling PDF Pro features during your trial. Enjoy unlimited conversions, larger file sizes, and priority processing."
+daysRemaining = "{{days}} days remaining"
+daysRemainingSingular = "{{days}} day remaining"
+title = "Your 30-Day Pro Trial"
+trialEnds = "Trial ends {{date}}"
+
 [onboarding.buttons]
 back = "Back"
 download = "Download →"
@@ -4947,7 +5006,10 @@ perMonth = "/month"
 perSeat = "/seat"
 popular = "Popular"
 selectPlan = "Select Plan"
+selectCredits = "Select Credit Amount"
 showComparison = "Compare All Features"
+purchase = "Purchase"
+totalCost = "Total Cost"
 upgrade = "Upgrade"
 withServer = "+ Server Plan"
 
@@ -5039,6 +5101,30 @@ successMessage = "Your license has been successfully activated. You can now clos
 name = "Team"
 siteLicense = "Site License"
 
+[plan.api]
+large = "5,000 Credits"
+medium = "1,000 Credits"
+small = "500 Credits"
+xsmall = "100 Credits"
+
+[plan.apiPackages]
+subtitle = "Purchase API credits for your applications"
+title = "API Credit Packages"
+
+[plan.trial]
+badge = "Trial"
+continueWithFree = "Continue with Free"
+daysRemaining = "Your trial ends in {{days}} days"
+endDate = "Expires: {{date}}"
+expired = "Your Trial Has Ended"
+expiredMessage = "Your 30-day Pro trial has expired. Subscribe to Pro to continue accessing premium features, or continue with our free tier."
+freeTierLimitations = "Free tier includes basic PDF tools with usage limits."
+message = ""
+subscribe = "Subscribe to Pro"
+subscribeToPro = "Subscribe to Pro"
+subscriptionScheduled = "Subscription scheduled - starts {{date}}"
+title = "Free Trial Active"
+
 [credits]
 enableOverageBilling = "Enable Overage Billing"
 maybeLater = "Maybe later"