refactor(webapp): derive controlled UI state during render (#4726)

## Summary

Derives controlled tab, tag, and checkbox values directly during render
instead of copying them through effects. Modal drafts now reset from
their open event, and the route-backed alert dialog renders open
immediately without a mount-time state update.

Author: carderne

apps/webapp/app/components/primitives/Checkbox.tsx

@@ -86,7 +86,7 @@ export const CheckboxWithLabel = React.forwardRef<HTMLInputElement, CheckboxProp
     ref
   ) => {
     const [isChecked, setIsChecked] = useState<boolean>(defaultChecked ?? false);
-    const [isDisabled, setIsDisabled] = useState<boolean>(disabled ?? false);
+    const isDisabled = disabled ?? false;
     const onChangeRef = React.useRef(onChange);
     const generatedId = React.useId();
     const inputId = id ?? generatedId;
@@ -102,10 +102,6 @@ export const CheckboxWithLabel = React.forwardRef<HTMLInputElement, CheckboxProp
     const isDisabledClassName = variants[variant].isDisabled;
     const inputPositionClasses = variants[variant].inputPosition;
 
-    useEffect(() => {
-      setIsDisabled(disabled ?? false);
-    }, [disabled]);
-
     useEffect(() => {
       onChangeRef.current = onChange;
     }, [onChange]);

apps/webapp/app/components/primitives/ClientTabs.tsx

@@ -20,18 +20,13 @@ const ClientTabs = React.forwardRef<
   React.ElementRef<typeof TabsPrimitive.Root>,
   React.ComponentPropsWithoutRef<typeof TabsPrimitive.Root>
 >(({ onValueChange, value: valueProp, defaultValue, ...props }, ref) => {
-  const [value, setValue] = React.useState<string | undefined>(valueProp ?? defaultValue);
-
-  React.useEffect(() => {
-    if (valueProp !== undefined) {
-      setValue(valueProp);
-    }
-  }, [valueProp]);
+  const [internalValue, setInternalValue] = React.useState<string | undefined>(defaultValue);
+  const value = valueProp ?? internalValue;
 
   const handleValueChange = React.useCallback(
     (nextValue: string) => {
       if (valueProp === undefined) {
-        setValue(nextValue);
+        setInternalValue(nextValue);
       }
       onValueChange?.(nextValue);
     },

apps/webapp/app/components/runs/v3/RunTagInput.tsx

@@ -1,4 +1,4 @@
-import { useCallback, useState, useEffect, type KeyboardEvent } from "react";
+import { useCallback, useState, type KeyboardEvent } from "react";
 import { AnimatePresence, motion } from "framer-motion";
 import { Input } from "~/components/primitives/Input";
 import { RunTag } from "./RunTag";
@@ -26,39 +26,30 @@ export function RunTagInput({
   maxTagLength = 128,
   onTagsChange,
 }: TagInputProps) {
-  // Use controlled tags if provided, otherwise use default
-  const initialTags = controlledTags ?? defaultTags;
-
-  const [tags, setTags] = useState<string[]>(initialTags);
+  const [internalTags, setInternalTags] = useState<string[]>(defaultTags);
+  const tags = controlledTags ?? internalTags;
   const [inputValue, setInputValue] = useState("");
 
-  // Sync internal state with external tag changes
-  useEffect(() => {
-    if (controlledTags !== undefined) {
-      setTags(controlledTags);
-    }
-  }, [controlledTags]);
-
   const addTag = useCallback(
     (tagText: string) => {
       const trimmedTag = tagText.trim();
       if (trimmedTag && !tags.includes(trimmedTag) && tags.length < maxTags) {
         const newTags = [...tags, trimmedTag];
-        setTags(newTags);
+        if (controlledTags === undefined) setInternalTags(newTags);
         onTagsChange?.(newTags);
       }
       setInputValue("");
     },
-    [tags, onTagsChange, maxTags]
+    [tags, controlledTags, onTagsChange, maxTags]
   );
 
   const removeTag = useCallback(
     (tagToRemove: string) => {
       const newTags = tags.filter((tag) => tag !== tagToRemove);
-      setTags(newTags);
+      if (controlledTags === undefined) setInternalTags(newTags);
       onTagsChange?.(newTags);
     },
-    [tags, onTagsChange]
+    [tags, controlledTags, onTagsChange]
   );
 
   const handleKeyDown = useCallback(

apps/webapp/app/components/schedules/PurchaseSchedulesModal.tsx

@@ -67,12 +67,16 @@ export function PurchaseSchedulesModal({
   const isLoading = fetcher.state !== "idle";
 
   const [open, setOpen] = useState(false);
-  // Reset the bundle stepper to the user's current extra-schedules count on
-  // each open. Earlier this only re-synced when `extraSchedules`/`stepSize`
-  // props changed, so if the user opened the modal, typed a value, cancelled,
-  // and reopened without purchasing, the stale draft persisted.
+  // Reset the bundle stepper to the user's current extra-schedules count on each open.
+  const handleOpenChange = (nextOpen: boolean) => {
+    if (nextOpen) setBundles(Math.round(extraSchedules / stepSize));
+    setOpen(nextOpen);
+  };
+
   useEffect(() => {
-    if (open) setBundles(Math.round(extraSchedules / stepSize));
+    if (!open) return;
+    // oxlint-disable-next-line react/react-compiler -- Keep the open draft aligned with authoritative billing values.
+    setBundles(Math.round(extraSchedules / stepSize));
   }, [open, extraSchedules, stepSize]);
 
   useEffect(() => {
@@ -113,7 +117,7 @@ export function PurchaseSchedulesModal({
   }
 
   return (
-    <Dialog open={open} onOpenChange={setOpen}>
+    <Dialog open={open} onOpenChange={handleOpenChange}>
       <DialogTrigger asChild>
         {triggerButton ?? (
           <Button variant="primary/small" onClick={() => setOpen(true)}>

apps/webapp/app/routes/_app.orgs.$organizationSlug.projects.$projectParam.env.$envParam.alerts.new/route.tsx

@@ -239,7 +239,6 @@ export const action = async ({ request, params }: ActionFunctionArgs) => {
 };
 
 export default function Page() {
-  const [isOpen, setIsOpen] = useState(false);
   const { slack, option, emailAlertsEnabled } = useTypedLoaderData<typeof loader>();
   const lastSubmission = useActionData();
   const navigation = useNavigation();
@@ -274,10 +273,6 @@ export default function Page() {
     shouldRevalidate: "onSubmit",
   });
 
-  useEffect(() => {
-    setIsOpen(true);
-  }, []);
-
   useEffect(() => {
     if (navigation.state !== "idle") return;
     if (lastSubmission !== undefined) return;
@@ -287,7 +282,7 @@ export default function Page() {
 
   return (
     <Dialog
-      open={isOpen}
+      open
       onOpenChange={(o) => {
         if (!o) {
           navigate(v3ProjectAlertsPath(organization, project, environment));