style: lowercase all user-facing strings and add custom eslint rule

Comprehensive sweep of all user-facing text to enforce lowercase
convention, including acronyms (api, rest, http, opml, json, totp,
mfa, qr, hmac). Added asa-lowercase/lowercase-strings eslint rule
that reports uppercase in notify() calls, error messages, jsx text,
and checked attributes (placeholder, alt, title).

1 files changed, 7 insertions, 7 deletions

diff --git a/apps/web/app/api/billing/create-checkout-session/route.ts b/apps/web/app/api/billing/create-checkout-session/route.ts
index cfbb388..d165cbc 100644
--- a/apps/web/app/api/billing/create-checkout-session/route.ts
+++ b/apps/web/app/api/billing/create-checkout-session/route.ts
@@ -12,12 +12,12 @@ export async function POST(request: Request) {
   } = await supabaseClient.auth.getUser()
 
   if (!user) {
-    return NextResponse.json({ error: "Not authenticated" }, { status: 401 })
+    return NextResponse.json({ error: "not authenticated" }, { status: 401 })
   }
 
   const rateLimitResult = rateLimit(`checkout:${user.id}`, 10, 60_000)
   if (!rateLimitResult.success) {
-    return NextResponse.json({ error: "Too many requests" }, { status: 429 })
+    return NextResponse.json({ error: "too many requests" }, { status: 429 })
   }
 
   const body = await request.json().catch(() => ({}))
@@ -38,7 +38,7 @@ export async function POST(request: Request) {
 
   if (!stripePriceIdentifier) {
     return NextResponse.json(
-      { error: "Invalid plan configuration" },
+      { error: "invalid plan configuration" },
       { status: 500 }
     )
   }
@@ -51,7 +51,7 @@ export async function POST(request: Request) {
 
   if (profileError || !profile) {
     return NextResponse.json(
-      { error: "Failed to load profile" },
+      { error: "failed to load profile" },
       { status: 500 }
     )
   }
@@ -62,7 +62,7 @@ export async function POST(request: Request) {
 
   if (currentRank >= targetRank) {
     return NextResponse.json(
-      { error: `Already on ${profile.tier} plan` },
+      { error: `already on ${profile.tier} plan` },
       { status: 400 }
     )
   }
@@ -76,7 +76,7 @@ export async function POST(request: Request) {
 
     if (!existingItemIdentifier) {
       return NextResponse.json(
-        { error: "Could not find existing subscription item" },
+        { error: "could not find existing subscription item" },
         { status: 500 }
       )
     }
@@ -123,7 +123,7 @@ export async function POST(request: Request) {
     if (updateError) {
       console.error("Admin client update error:", updateError)
       return NextResponse.json(
-        { error: "Failed to save customer: " + updateError.message },
+        { error: "failed to save customer: " + updateError.message },
         { status: 500 }
       )
     }