# Mobile Event Edit Modal Implementation Plan

> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.

**Goal:** Replace the mobile-unusable centred `Dialog` on `EventDialog` with a shadcn `Drawer` (Vaul) that guides the user through three steps — Details, Schedule, Recurrence — while preserving the desktop `Dialog` unchanged.

**Architecture:** `useIsMobile` drives a conditional render: desktop gets the existing `Dialog`, mobile gets a new `Drawer` that renders one of three step components (`DetailsStep`, `ScheduleStep`, `RecurrenceStep`) at a time. Step state lives in a small inline hook. The single `useForm` instance is shared across all steps so data is never lost.

**Tech Stack:** Next.js 15, React 19, React Hook Form 7, shadcn/ui (Vaul `Drawer`), Bun test runner, Biome

---

## File Map

| File | Action | Responsibility |
|------|--------|----------------|
| `src/components/ui/drawer.tsx` | **Create** | shadcn Drawer primitives wrapping Vaul |
| `src/components/event-dialog.tsx` | **Modify** | add step hook, `DetailsStep`, `ScheduleStep`, `RecurrenceStep`, Drawer branch |
| `src/components/ui/dialog.tsx` | **Modify** | remove `isMobile` forks from `DialogContent` and `DialogFooter` |
| `tests/event-dialog.test.tsx` | **Modify** | add tests for step sections, progress bars, AI banner, step footer labels |
| `tests/mobile-hook-adoption.test.ts` | **Modify** | add `drawer.tsx` to the hook-driven files list |

---

## Task 1: Install Vaul and add `drawer.tsx`

**Files:**
- Create: `src/components/ui/drawer.tsx`
- Modify: `package.json`, `bun.lock`

- [ ] **Step 1: Install Vaul**

```bash
bun add vaul
```

Expected: `vaul` appears in `dependencies` in `package.json`.

- [ ] **Step 2: Create `src/components/ui/drawer.tsx`**

```tsx
"use client";

import * as React from "react";
import { Drawer as DrawerPrimitive } from "vaul";
import { cn } from "@/lib/utils";

function Drawer({
	shouldScaleBackground = true,
	...props
}: React.ComponentProps<typeof DrawerPrimitive.Root>) {
	return (
		<DrawerPrimitive.Root
			shouldScaleBackground={shouldScaleBackground}
			{...props}
		/>
	);
}

function DrawerTrigger({
	...props
}: React.ComponentProps<typeof DrawerPrimitive.Trigger>) {
	return <DrawerPrimitive.Trigger {...props} />;
}

function DrawerPortal({
	...props
}: React.ComponentProps<typeof DrawerPrimitive.Portal>) {
	return <DrawerPrimitive.Portal {...props} />;
}

function DrawerClose({
	...props
}: React.ComponentProps<typeof DrawerPrimitive.Close>) {
	return <DrawerPrimitive.Close {...props} />;
}

function DrawerOverlay({
	className,
	...props
}: React.ComponentProps<typeof DrawerPrimitive.Overlay>) {
	return (
		<DrawerPrimitive.Overlay
			className={cn("fixed inset-0 z-50 bg-background/80 backdrop-blur-[2px]", className)}
			{...props}
		/>
	);
}

function DrawerContent({
	className,
	children,
	...props
}: React.ComponentProps<typeof DrawerPrimitive.Content>) {
	return (
		<DrawerPortal>
			<DrawerOverlay />
			<DrawerPrimitive.Content
				className={cn(
					"fixed inset-x-0 bottom-0 z-50 flex flex-col rounded-t-[22px] bg-card shadow-xl outline-none",
					className,
				)}
				{...props}
			>
				<div className="mx-auto mt-3 h-1.5 w-12 shrink-0 rounded-full bg-muted" />
				{children}
			</DrawerPrimitive.Content>
		</DrawerPortal>
	);
}

function DrawerHeader({ className, ...props }: React.ComponentProps<"div">) {
	return (
		<div
			className={cn("flex flex-col gap-1.5 px-4 pb-3 pt-2 border-b border-border", className)}
			{...props}
		/>
	);
}

function DrawerFooter({ className, ...props }: React.ComponentProps<"div">) {
	return (
		<div
			className={cn(
				"sticky bottom-0 grid grid-cols-[0.8fr_1.2fr] gap-3 bg-gradient-to-t from-card via-card/95 to-transparent px-4 pb-6 pt-4",
				className,
			)}
			{...props}
		/>
	);
}

function DrawerTitle({
	className,
	...props
}: React.ComponentProps<typeof DrawerPrimitive.Title>) {
	return (
		<DrawerPrimitive.Title
			className={cn("text-[22px] font-semibold leading-none tracking-[-0.06em]", className)}
			{...props}
		/>
	);
}

function DrawerDescription({
	className,
	...props
}: React.ComponentProps<typeof DrawerPrimitive.Description>) {
	return (
		<DrawerPrimitive.Description
			className={cn("text-sm text-muted-foreground leading-snug", className)}
			{...props}
		/>
	);
}

export {
	Drawer,
	DrawerClose,
	DrawerContent,
	DrawerDescription,
	DrawerFooter,
	DrawerHeader,
	DrawerOverlay,
	DrawerPortal,
	DrawerTitle,
	DrawerTrigger,
};
```

- [ ] **Step 3: Verify the file compiles with no import errors**

```bash
cd /path/to/project && bun run build 2>&1 | grep -i "drawer" | head -20
```

Expected: no errors mentioning `drawer.tsx`.

- [ ] **Step 4: Commit**

```bash
git add src/components/ui/drawer.tsx package.json bun.lock
git commit -m "feat: add shadcn Drawer component (Vaul)"
```

---

## Task 2: Write failing tests for the Drawer branch

**Files:**
- Modify: `tests/event-dialog.test.tsx`
- Modify: `tests/mobile-hook-adoption.test.ts`

- [ ] **Step 1: Add source-level assertions to `tests/event-dialog.test.tsx`**

Replace the entire file with:

```tsx
import { describe, expect, test } from "bun:test";
import { readFileSync } from "node:fs";
import { getEventFormValuesFromEvent } from "@/lib/event-form";

describe("EventDialog public modes", () => {
	test("accepts AI-prefilled editable initial values through its public props", () => {
		const initialValues = getEventFormValuesFromEvent({
			title: "AI Draft",
			start: "2026-04-09T10:00:00.000Z",
			recurrenceRule: "FREQ=WEEKLY;INTERVAL=1;BYDAY=TH",
		});

		expect(initialValues.title).toBe("AI Draft");
		expect(initialValues.start).toBe("2026-04-09T10:00:00.000Z");
		expect(initialValues.recurrenceRule).toBe("FREQ=WEEKLY;INTERVAL=1;BYDAY=TH");
	});

	test("dialog content uses console surface classes instead of generic border and shadow", () => {
		const source = readFileSync("src/components/ui/dialog.tsx", "utf8");

		expect(source).toContain("rounded-[10px]");
		expect(source).toContain("shadow-xl");
		expect(source).not.toContain("rounded-lg border p-6 shadow-lg");
	});

	test("dialog source uses console section labels and grouped field regions", () => {
		const source = readFileSync("src/components/event-dialog.tsx", "utf8");

		expect(source).toContain("Event details");
		expect(source).toContain("Schedule");
		expect(source).toContain("Recurrence");
	});

	test("event-dialog imports Drawer for mobile branch", () => {
		const source = readFileSync("src/components/event-dialog.tsx", "utf8");

		expect(source).toContain("from \"@/components/ui/drawer\"");
	});

	test("event-dialog renders three step components", () => {
		const source = readFileSync("src/components/event-dialog.tsx", "utf8");

		expect(source).toContain("DetailsStep");
		expect(source).toContain("ScheduleStep");
		expect(source).toContain("RecurrenceStep");
	});

	test("event-dialog includes step progress bars", () => {
		const source = readFileSync("src/components/event-dialog.tsx", "utf8");

		// Three progress bar divs rendered inside a grid-cols-3 container
		expect(source).toContain("grid-cols-3");
	});

	test("event-dialog includes step counter badge", () => {
		const source = readFileSync("src/components/event-dialog.tsx", "utf8");

		// Step badge like "1 / 3"
		expect(source).toContain("/ 3");
	});

	test("drawer footer shows Cancel on step 1 and Back on steps 2 and 3", () => {
		const source = readFileSync("src/components/event-dialog.tsx", "utf8");

		expect(source).toContain("Cancel");
		expect(source).toContain("Back");
	});

	test("drawer footer shows Save only on step 3", () => {
		const source = readFileSync("src/components/event-dialog.tsx", "utf8");

		expect(source).toContain("Save");
		expect(source).toContain("Next");
	});

	test("event-dialog resets step to 1 on close", () => {
		const source = readFileSync("src/components/event-dialog.tsx", "utf8");

		expect(source).toContain("setStep(1)");
	});

	test("dialog.tsx no longer forks on isMobile in DialogContent", () => {
		const source = readFileSync("src/components/ui/dialog.tsx", "utf8");

		// isMobile should not be used to conditionally apply max-w inside DialogContent
		expect(source).not.toContain("isMobile ? undefined : \"max-w-lg\"");
	});

	test("dialog.tsx no longer forks on isMobile in DialogFooter", () => {
		const source = readFileSync("src/components/ui/dialog.tsx", "utf8");

		// DialogFooter should not branch on isMobile
		expect(source).not.toContain("isMobile\n\t\t\t\t? \"flex flex-col-reverse gap-2\"");
	});
});
```

- [ ] **Step 2: Add `drawer.tsx` to hook-driven file list in `tests/mobile-hook-adoption.test.ts`**

In `tests/mobile-hook-adoption.test.ts`, add `"src/components/ui/drawer.tsx"` to the `HOOK_DRIVEN_FILES` array. The drawer itself does not call `useIsMobile` (the caller decides the branch), so only add it to `HOOK_DRIVEN_FILES` — not to `DIRECT_HOOK_FILES`. The test checks that it contains no Tailwind breakpoint prefixes.

Replace the `HOOK_DRIVEN_FILES` array:

```ts
const HOOK_DRIVEN_FILES = [
	"src/app/page.tsx",
	"src/app/demo/combined-date-picker/page.tsx",
	"src/components/ai-toolbar.tsx",
	"src/components/event-dialog.tsx",
	"src/components/settings-panel.tsx",
	"src/components/ui/calendar.tsx",
	"src/components/ui/date-picker.tsx",
	"src/components/ui/dialog.tsx",
	"src/components/ui/drawer.tsx",
	"src/components/ui/input-group.tsx",
	"src/components/ui/textarea.tsx",
	"src/lib/ui-shell-contract.ts",
];
```

- [ ] **Step 3: Run the new tests and confirm they fail for the right reasons**

```bash
bun test tests/event-dialog.test.tsx 2>&1
```

Expected: the four new tests (`imports Drawer`, `renders three step components`, `grid-cols-3`, `/ 3`, `setStep(1)`, `no longer forks`) FAIL because the implementation does not exist yet. The first three existing tests should still PASS.

- [ ] **Step 4: Commit the failing tests**

```bash
git add tests/event-dialog.test.tsx tests/mobile-hook-adoption.test.ts
git commit -m "test: add failing tests for Drawer mobile branch in EventDialog"
```

---

## Task 3: Extract step sub-components inside `event-dialog.tsx`

**Files:**
- Modify: `src/components/event-dialog.tsx`

These are pure presentational helpers declared at the bottom of the same file. They receive form state as props and render one section's fields.

- [ ] **Step 1: Add the `StepProps` interface and `DetailsStep` at the bottom of `event-dialog.tsx`**

Below the closing `};` of `EventDialog`, add:

```tsx
interface StepProps {
	control: ReturnType<typeof useForm<EventFormValues>>["control"];
	register: ReturnType<typeof useForm<EventFormValues>>["register"];
	errors: ReturnType<typeof useForm<EventFormValues>>["formState"]["errors"];
	watch: ReturnType<typeof useForm<EventFormValues>>["watch"];
	setValue: ReturnType<typeof useForm<EventFormValues>>["setValue"];
	isAiDraft: boolean;
}

function AiDraftBanner() {
	return (
		<div className="rounded-md border border-primary/20 bg-primary/5 px-3 py-2 text-xs leading-relaxed text-primary">
			This draft was generated from natural language. Double-check
			dates, times, location, recurrence, and links before saving.
		</div>
	);
}

function DetailsStep({ control, register, errors, isAiDraft }: Omit<StepProps, "watch" | "setValue">) {
	const isMobile = useIsMobile();
	return (
		<div className="grid gap-4">
			{isAiDraft && <AiDraftBanner />}
			<div className="space-y-1.5">
				<Label htmlFor="event-title">Title</Label>
				<Input
					id="event-title"
					placeholder="Event title"
					className="font-medium"
					{...register("title")}
				/>
				{errors.title && (
					<p className="text-xs text-destructive">{errors.title.message}</p>
				)}
			</div>
			<div className="space-y-1.5">
				<Label htmlFor="event-description">Description / notes</Label>
				<Textarea
					id="event-description"
					className="field-sizing-content min-h-[60px] max-h-40 resize-none placeholder:text-muted-foreground/50"
					placeholder="Add a description..."
					{...register("description")}
				/>
			</div>
			<div className={isMobile ? "grid grid-cols-1 gap-3" : "grid grid-cols-2 gap-3"}>
				<div className="space-y-1.5">
					<Label htmlFor="event-location">Location</Label>
					<Controller
						name="location"
						control={control}
						render={({ field }) => (
							<LocationAutocomplete
								id="event-location"
								onChange={field.onChange}
								value={field.value}
							/>
						)}
					/>
				</div>
				<div className="space-y-1.5">
					<Label htmlFor="event-url">URL</Label>
					<Input id="event-url" placeholder="URL" {...register("url")} />
					{errors.url && (
						<p className="text-xs text-destructive">{errors.url.message}</p>
					)}
				</div>
			</div>
		</div>
	);
}
```

Note: `DetailsStep` keeps the `isMobile` grid split for location/URL since that layout distinction is within the step body, not the container choice.

- [ ] **Step 2: Add `ScheduleStep` below `DetailsStep`**

```tsx
function ScheduleStep({ control, errors, watch, setValue, isAiDraft }: Omit<StepProps, "register">) {
	const allDay = watch("allDay");
	const start = watch("start");

	const DURATIONS = [
		{ label: "+15 min", minutes: 15 },
		{ label: "+30 min", minutes: 30 },
		{ label: "+1 hour", minutes: 60 },
		{ label: "+3 hours", minutes: 180 },
	];

	const handleApplyDuration = (minutes: number) => {
		if (!start) return;
		const base = parseISO(start);
		if (!isValid(base)) return;
		const next =
			minutes < 60 ? addMinutes(base, minutes) : addHours(base, minutes / 60);
		const pad = (v: number) => String(v).padStart(2, "0");
		const result = allDay
			? `${next.getFullYear()}-${pad(next.getMonth() + 1)}-${pad(next.getDate())}`
			: `${next.getFullYear()}-${pad(next.getMonth() + 1)}-${pad(next.getDate())}T${pad(next.getHours())}:${pad(next.getMinutes())}:00`;
		setValue("end", result, { shouldDirty: true });
	};

	return (
		<div className="grid gap-4">
			{isAiDraft && <AiDraftBanner />}
			<div className="flex items-center gap-2 py-1">
				<Controller
					name="allDay"
					control={control}
					render={({ field }) => (
						<Checkbox
							id="event-all-day"
							checked={field.value}
							onCheckedChange={(checked) => field.onChange(checked === true)}
						/>
					)}
				/>
				<Label htmlFor="event-all-day" className="cursor-pointer text-sm font-normal">
					All day
				</Label>
			</div>
			<div className="space-y-2">
				<Controller
					name="start"
					control={control}
					render={({ field }) => (
						<DateTimePicker
							value={field.value}
							onChange={field.onChange}
							allDay={allDay}
							placeholder="Start date"
						/>
					)}
				/>
				{!allDay && (
					<div className="flex gap-1 pl-0.5">
						{DURATIONS.map(({ label, minutes }) => (
							<Button
								key={label}
								type="button"
								variant="ghost"
								size="sm"
								disabled={!start}
								onClick={() => handleApplyDuration(minutes)}
								className="px-2 py-1 text-xs text-muted-foreground"
							>
								{label}
							</Button>
						))}
					</div>
				)}
				<Controller
					name="end"
					control={control}
					render={({ field }) => (
						<DateTimePicker
							value={field.value}
							onChange={field.onChange}
							allDay={allDay}
							placeholder="End date"
						/>
					)}
				/>
				{errors.start && (
					<p className="text-xs text-destructive">{errors.start.message}</p>
				)}
				{errors.end && (
					<p className="text-xs text-destructive">{errors.end.message}</p>
				)}
			</div>
		</div>
	);
}
```

- [ ] **Step 3: Add `RecurrenceStep` below `ScheduleStep`**

```tsx
function RecurrenceStep({ control, errors, watch, isAiDraft }: Omit<StepProps, "register" | "setValue">) {
	const start = watch("start");
	return (
		<div className="grid gap-4">
			{isAiDraft && <AiDraftBanner />}
			<Controller
				name="recurrenceRule"
				control={control}
				render={({ field }) => (
					<RecurrencePicker
						value={field.value}
						onChange={field.onChange}
						start={start}
					/>
				)}
			/>
			{errors.recurrenceRule && (
				<p className="text-xs text-destructive">{errors.recurrenceRule.message}</p>
			)}
		</div>
	);
}
```

- [ ] **Step 4: Run tests — step component tests should start passing**

```bash
bun test tests/event-dialog.test.tsx 2>&1
```

Expected: `renders three step components` and `dialog source uses console section labels` PASS. Tests for `imports Drawer`, `grid-cols-3`, `/ 3`, `setStep(1)`, footer labels, and `isMobile` fork removal still FAIL.

- [ ] **Step 5: Commit**

```bash
git add src/components/event-dialog.tsx
git commit -m "refactor: extract DetailsStep, ScheduleStep, RecurrenceStep into EventDialog"
```

---

## Task 4: Add the Drawer branch to `EventDialog`

**Files:**
- Modify: `src/components/event-dialog.tsx`

- [ ] **Step 1: Add Drawer imports at the top of `event-dialog.tsx`**

After the existing `Dialog` imports block, add:

```tsx
import {
	Drawer,
	DrawerContent,
	DrawerDescription,
	DrawerFooter,
	DrawerHeader,
	DrawerTitle,
} from "@/components/ui/drawer";
```

- [ ] **Step 2: Add step state inside `EventDialog`, just after the `useForm` call**

```tsx
const [step, setStep] = React.useState<1 | 2 | 3>(1);
const advanceStep = () => setStep((s) => Math.min(s + 1, 3) as 1 | 2 | 3);
const retreatStep = () => setStep((s) => Math.max(s - 1, 1) as 1 | 2 | 3);
```

- [ ] **Step 3: Update `handleOpenChange` to reset step**

Replace the existing `handleOpenChange` function:

```tsx
const handleOpenChange = (nextOpen: boolean) => {
	if (!nextOpen) {
		reset(getDefaultEventFormValues());
		setStep(1);
		onReset();
	}
	onOpenChange(nextOpen);
};
```

- [ ] **Step 4: Add per-step field name sets for partial validation**

After the `handleOpenChange` function, add:

```tsx
const STEP_FIELDS: Record<1 | 2 | 3, (keyof EventFormValues)[]> = {
	1: ["title", "url"],
	2: ["start", "end"],
	3: ["recurrenceRule"],
};

const handleNext = async () => {
	const valid = await trigger(STEP_FIELDS[step]);
	if (valid) advanceStep();
};

const handleSave = handleSubmit((values) => {
	const result = validateEventFormValues(values);
	if (!result.success) {
		const fieldErrors = result.error.flatten().fieldErrors;
		let firstErrorStep: 1 | 2 | 3 | null = null;
		for (const [fieldName, messages] of Object.entries(fieldErrors)) {
			const firstMessage = messages?.[0];
			if (firstMessage) {
				setError(fieldName as keyof EventFormValues, { message: firstMessage });
				const ownerStep = (
					Object.entries(STEP_FIELDS) as [string, (keyof EventFormValues)[]][]
				).find(([, fields]) =>
					fields.includes(fieldName as keyof EventFormValues),
				)?.[0];
				const ownerStepNum = ownerStep ? (Number(ownerStep) as 1 | 2 | 3) : null;
				if (ownerStepNum !== null && (firstErrorStep === null || ownerStepNum < firstErrorStep)) {
					firstErrorStep = ownerStepNum;
				}
			}
		}
		if (firstErrorStep !== null) setStep(firstErrorStep);
		return;
	}

	if (values.recurrenceRule) {
		const recurrenceValidation = validateRecurrence(
			parseRecurrenceRule(values.recurrenceRule),
		);
		if (!recurrenceValidation.isValid) {
			setError("recurrenceRule", {
				message:
					recurrenceValidation.errors.rule ||
					recurrenceValidation.errors.count ||
					recurrenceValidation.errors.until ||
					"Invalid recurrence.",
			});
			setStep(3);
			return;
		}
	}

	onSave(result.data);
	reset(getDefaultEventFormValues());
});
```

Also add `trigger` to the destructuring from `useForm`:

```tsx
const {
	control,
	handleSubmit,
	register,
	reset,
	setError,
	setValue,
	trigger,
	watch,
	formState: { errors },
} = useForm<EventFormValues>({
	defaultValues: getDefaultEventFormValues(),
});
```

- [ ] **Step 5: Replace the `return` statement with a conditional render**

Replace the entire `return (...)` block (from `return (` through the closing `);`) with:

```tsx
const stepProps = { control, register, errors, watch, setValue, isAiDraft };

const progressBars = (
	<div className="grid grid-cols-3 gap-1.5 px-4 pt-2 pb-3">
		{([1, 2, 3] as const).map((n) => (
			<div
				key={n}
				className={cn(
					"h-[3px] rounded-full transition-colors duration-200",
					n <= step ? "bg-foreground" : "bg-muted",
				)}
			/>
		))}
	</div>
);

const stepTitles: Record<1 | 2 | 3, string> = {
	1: "Event Details",
	2: "Schedule",
	3: "Recurrence",
};

if (!isMobile) {
	return (
		<Dialog open={open} onOpenChange={handleOpenChange}>
			<DialogContent className="max-w-2xl rounded-[10px] bg-card p-0 shadow-xl">
				<DialogHeader className="px-6 py-5 shadow-[inset_0_-1px_0_0_var(--color-border)]">
					<DialogTitle className="text-[28px] tracking-[-0.06em]">
						{titleText}
					</DialogTitle>
					<DialogDescription>{descriptionText}</DialogDescription>
				</DialogHeader>
				<form className="grid gap-6 px-6 py-5" onSubmit={onSubmit}>
					{isAiDraft && (
						<div className="rounded-md border border-primary/20 bg-primary/5 px-3 py-2 text-xs leading-relaxed text-primary">
							This draft was generated from natural language. Double-check
							dates, times, location, recurrence, and links before saving.
						</div>
					)}
					<section className="grid gap-3">
						<p className="font-mono text-[11px] uppercase text-muted-foreground">
							Event details
						</p>
						<DetailsStep {...stepProps} />
					</section>
					<section className="grid gap-3">
						<p className="font-mono text-[11px] uppercase text-muted-foreground">
							Schedule
						</p>
						<ScheduleStep {...stepProps} />
					</section>
					<section className="grid gap-3">
						<p className="font-mono text-[11px] uppercase text-muted-foreground">
							Recurrence
						</p>
						<RecurrenceStep {...stepProps} />
					</section>
					<DialogFooter>
						<Button type="button" variant="ghost" onClick={() => handleOpenChange(false)}>
							Cancel
						</Button>
						<Button type="submit">{saveLabel}</Button>
					</DialogFooter>
				</form>
			</DialogContent>
		</Dialog>
	);
}

return (
	<Drawer open={open} onOpenChange={handleOpenChange}>
		<DrawerContent>
			<DrawerHeader>
				<div className="flex items-start justify-between gap-3">
					<div>
						<DrawerTitle>{stepTitles[step]}</DrawerTitle>
						<DrawerDescription className="mt-1">
							{step === 1 && "Title and start date are required."}
							{step === 2 && "Set your event's date and time."}
							{step === 3 && "Optionally repeat this event."}
						</DrawerDescription>
					</div>
					<span className="shrink-0 rounded-full bg-muted px-2.5 py-1 text-xs text-muted-foreground">
						{step} / 3
					</span>
				</div>
			</DrawerHeader>
			{progressBars}
			<form onSubmit={handleSave}>
				<div className="overflow-y-auto px-4 pb-4 max-h-[55dvh]">
					{step === 1 && <DetailsStep {...stepProps} />}
					{step === 2 && <ScheduleStep {...stepProps} />}
					{step === 3 && <RecurrenceStep {...stepProps} />}
				</div>
				<DrawerFooter>
					<Button
						type="button"
						variant="outline"
						onClick={step === 1 ? () => handleOpenChange(false) : retreatStep}
					>
						{step === 1 ? "Cancel" : "Back"}
					</Button>
					{step < 3 ? (
						<Button type="button" onClick={handleNext}>
							Next
						</Button>
					) : (
						<Button type="submit">{saveLabel}</Button>
					)}
				</DrawerFooter>
			</form>
		</DrawerContent>
	</Drawer>
);
```

Also add `cn` to the imports from `@/lib/utils` if not already present:

```tsx
import { cn } from "@/lib/utils";
```

And remove the now-redundant `handleApplyDuration` and `DURATIONS` from the top of `EventDialog` (they moved into `ScheduleStep`). Also remove the `onSubmit` function — it has been superseded by `handleSave`. Remove `allDay` and `start` from the top-level `watch` calls (they live in `ScheduleStep` now).

- [ ] **Step 6: Run tests — expect most new tests to pass**

```bash
bun test tests/event-dialog.test.tsx 2>&1
```

Expected: all tests except the two `isMobile` fork removal tests PASS (those require the next task).

- [ ] **Step 7: Commit**

```bash
git add src/components/event-dialog.tsx
git commit -m "feat: add mobile Drawer branch with guided steps to EventDialog"
```

---

## Task 5: Clean up `dialog.tsx` — remove `isMobile` forks

**Files:**
- Modify: `src/components/ui/dialog.tsx`

- [ ] **Step 1: Remove `isMobile` from `DialogContent`**

In `src/components/ui/dialog.tsx`, `DialogContent` currently does:

```tsx
const isMobile = useIsMobile();
// ...
className={cn(
  "...",
  isMobile ? undefined : "max-w-lg",
  className,
)}
```

Replace the entire `DialogContent` function with a version that always applies `max-w-lg` and removes the `useIsMobile` call:

```tsx
function DialogContent({
	className,
	children,
	showCloseButton = true,
	...props
}: React.ComponentProps<typeof DialogPrimitive.Content> & {
	showCloseButton?: boolean;
}) {
	return (
		<DialogPortal data-slot="dialog-portal">
			<DialogOverlay />
			<DialogPrimitive.Content
				data-slot="dialog-content"
				className={cn(
					"bg-card text-card-foreground data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 fixed top-[50%] left-[50%] z-50 grid w-full max-w-[calc(100%-2rem)] translate-x-[-50%] translate-y-[-50%] gap-5 rounded-[10px] p-6 shadow-xl duration-200 max-w-lg",
					className,
				)}
				{...props}
			>
				{children}
				{showCloseButton && (
					<DialogPrimitive.Close
						data-slot="dialog-close"
						className="focus:ring-ring/30 data-[state=open]:bg-accent data-[state=open]:text-muted-foreground absolute top-4 right-4 rounded-[6px] p-1 opacity-70 transition-[background-color,opacity] hover:opacity-100 focus:ring-[3px] focus:outline-none disabled:pointer-events-none [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4"
					>
						<XIcon />
						<span className="sr-only">Close</span>
					</DialogPrimitive.Close>
				)}
			</DialogPrimitive.Content>
		</DialogPortal>
	);
}
```

- [ ] **Step 2: Remove `isMobile` from `DialogFooter`**

Replace the `DialogFooter` function with a version that always uses the desktop layout (the mobile layout is now inside `DrawerFooter`):

```tsx
function DialogFooter({ className, ...props }: React.ComponentProps<"div">) {
	return (
		<div
			data-slot="dialog-footer"
			className={cn("flex flex-row justify-end gap-2", className)}
			{...props}
		/>
	);
}
```

- [ ] **Step 3: Remove unused `useIsMobile` import from `dialog.tsx`**

Delete the import line:

```tsx
import { useIsMobile } from "@/hooks/use-mobile";
```

- [ ] **Step 4: Run tests — all should pass**

```bash
bun test tests/event-dialog.test.tsx 2>&1
```

Expected: all 13 tests PASS.

- [ ] **Step 5: Run the full test suite and confirm no regressions**

```bash
bun test 2>&1 | tail -10
```

Expected: same number of passing tests as before (99), same pre-existing failures — no new failures introduced.

- [ ] **Step 6: Commit**

```bash
git add src/components/ui/dialog.tsx
git commit -m "refactor: remove isMobile forks from DialogContent and DialogFooter"
```

---

## Task 6: Final verification

**Files:** none

- [ ] **Step 1: Run the full test suite**

```bash
bun test 2>&1 | tail -15
```

Expected: 99 + 10 new = ~109 passing, same 17 pre-existing failures, 0 new failures.

- [ ] **Step 2: Run Biome lint**

```bash
bun run lint 2>&1 | tail -20
```

Expected: no new errors in `src/components/ui/drawer.tsx` or `src/components/event-dialog.tsx`.

- [ ] **Step 3: Confirm no Tailwind breakpoint prefixes in drawer.tsx**

```bash
bun test tests/mobile-hook-adoption.test.ts 2>&1
```

Expected: all 3 tests in `mobile hook adoption` PASS.

- [ ] **Step 4: Final commit if any lint auto-fixes were applied**

```bash
git add -A && git diff --cached --stat
# Only commit if there are changes
git commit -m "chore: apply Biome lint fixes after mobile drawer implementation"
```

---

## Self-Review Against Spec

| Spec requirement | Task covering it |
|-----------------|-----------------|
| Desktop: `Dialog` unchanged | Task 4, `!isMobile` branch |
| Mobile: Vaul `Drawer` | Tasks 1 + 4 |
| Three steps: Details / Schedule / Recurrence | Task 3 |
| Step footer: Cancel→Next / Back→Next / Back→Save | Task 4, `DrawerFooter` |
| "Next" validates only current step fields | Task 4, `handleNext` + `STEP_FIELDS` |
| "Save" validates all, jumps to first error step | Task 4, `handleSave` |
| Progress bars (grid-cols-3) | Task 4, `progressBars` |
| Step badge "x / 3" | Task 4, `DrawerHeader` |
| AI banner per-step (not once) | Tasks 3 + 4, `AiDraftBanner` in each step |
| Error jump to lowest error step | Task 4, `handleSave` loop |
| Step resets to 1 on close | Task 4, `handleOpenChange` |
| Remove `isMobile` from `DialogContent` | Task 5 |
| Remove `isMobile` from `DialogFooter` | Task 5 |
| `drawer.tsx` in hook-driven file list | Task 2 |
| Shared `useForm` instance | Task 4 — single `useForm` at `EventDialog` level |