Remove seatlessPlans LaunchDarkly flag (#38299)

# Remove seatlessPlans LaunchDarkly Flag

## Summary
This PR removes the `seatlessPlans` LaunchDarkly feature flag from the dashboard codebase since it has been fully rolled out to `true`. The cleanup removes the feature flag infrastructure while preserving the current production behavior.

## Changes Made
- **useLaunchDarkly.tsx**: Removed `seatlessPlans` flag definition from type and defaults object
- **billing.ts**: Removed conditional plan filtering logic in `useListPlans` function - now returns all plans (the "true" behavior)
- **PlanCard.tsx**: Removed conditional text logic - now always shows "Starter" text (the "true" behavior)

## Behavior Preserved
Since the flag was rolled out to `true`, this PR preserves the current production behavior:
- All plans are returned from the API (no filtering based on `seatPrice`)
- Professional plan description shows "Everything in Starter" text

## Testing
- ✅ Linting passed with `just lint-js`
- ✅ Formatting applied with `just format-js`
- ✅ Verified no remaining `seatlessPlans` references in codebase

## Link to Devin run
https://app.devin.ai/sessions/c2cdb5c420d54a3ca6087f04e4c5b126

Co-Authored-By: nipunn@convex.dev
GitOrigin-RevId: 16face8ccd25366a30547685de2dd314f50dc9b1

Author: devin-ai-integration[bot]

npm-packages/dashboard/src/api/billing.ts

@@ -1,4 +1,3 @@
-import { useLaunchDarkly } from "hooks/useLaunchDarkly";
 import { useBBMutation, useBBQuery } from "./api";
 
 export function useTeamOrbSubscription(teamId?: number) {
@@ -161,8 +160,6 @@ export function useListInvoices(teamId?: number) {
 }
 
 export function useListPlans(teamId?: number) {
-  const { seatlessPlans } = useLaunchDarkly();
-
   const { data, error, isLoading } = useBBQuery({
     path: "/teams/{team_id}/list_active_plans",
     pathParams: {
@@ -178,13 +175,8 @@ export function useListPlans(teamId?: number) {
     throw error;
   }
 
-  let plans = data?.plans;
-  if (plans && !seatlessPlans) {
-    plans = plans.filter((plan) => plan.seatPrice);
-  }
-
   return {
-    plans,
+    plans: data?.plans,
     isLoading,
   };
 }

npm-packages/dashboard/src/components/billing/planCards/PlanCard.tsx

@@ -1,6 +1,5 @@
 import classNames from "classnames";
 import { PlanResponse } from "generatedApi";
-import { useLaunchDarkly } from "hooks/useLaunchDarkly";
 
 export const planNameMap: Record<string, string> = {
   CONVEX_STARTER_PLUS: "Starter",
@@ -18,7 +17,6 @@ export function PlanCard({
   saleHeader: React.ReactNode | string;
   action: React.ReactNode;
 }) {
-  const { seatlessPlans } = useLaunchDarkly();
   return (
     <div
       className={classNames(
@@ -56,7 +54,7 @@ export function PlanCard({
           )}
           {plan.planType === "CONVEX_PROFESSIONAL" && (
             <ul className="ml-4 list-disc">
-              <li>Everything in {seatlessPlans ? "Starter" : "Free"}</li>
+              <li>Everything in Starter</li>
               <li>Up to 20 team members</li>
               <li>Unlimited projects</li>
               <li>Higher included usage limits</li>

npm-packages/dashboard/src/hooks/useLaunchDarkly.tsx

@@ -15,15 +15,13 @@ const flagDefaults: {
   commandPalette: boolean;
   commandPaletteDeleteProjects: boolean;
   multipleUserIdentities: boolean;
-  seatlessPlans: boolean;
 } = {
   oauthProviderConfiguration: {},
   enableIndexFilters: false,
   referralsPage: false,
   commandPalette: false,
   commandPaletteDeleteProjects: false,
   multipleUserIdentities: false,
-  seatlessPlans: false,
 };
 
 function kebabCaseKeys(object: typeof flagDefaults) {