feat: git-like project versioning (v1)

Linear per-project history per notes/project-versioning.md: named
checkpoints (thumbnail via renderer.captureFrame) plus auto-checkpoints
on save (60s throttle, ring of 20, named never rotate). Restore writes a
safety checkpoint first, then swaps the document outside undo/redo.
Media assets referenced by any version are pinned against deletion.
Migration v31-v32 stamps the schema; the version store lives in its own
IDB database with an in-memory fallback for tests. Versions popover in
the editor header for jump/rename/delete. 12 new tests.

1 files changed, 77 insertions, 0 deletions

diff --git a/apps/web/src/versions/components/version-name-dialog.tsx b/apps/web/src/versions/components/version-name-dialog.tsx
new file mode 100644
index 00000000..f0514f5a
--- /dev/null
+++ b/apps/web/src/versions/components/version-name-dialog.tsx
@@ -0,0 +1,77 @@
+import { Button } from "@/components/ui/button";
+import {
+	Dialog,
+	DialogBody,
+	DialogContent,
+	DialogFooter,
+	DialogHeader,
+	DialogTitle,
+} from "@/components/ui/dialog";
+import { Input } from "@/components/ui/input";
+import { useState } from "react";
+import { Label } from "@/components/ui/label";
+
+export function VersionNameDialog({
+	isOpen,
+	onOpenChange,
+	onConfirm,
+	mode,
+	initialName = "",
+}: {
+	isOpen: boolean;
+	onOpenChange: (open: boolean) => void;
+	onConfirm: (name: string) => void;
+	mode: "create" | "rename";
+	initialName?: string;
+}) {
+	const [name, setName] = useState(initialName);
+
+	const handleOpenChange = (open: boolean) => {
+		if (open) {
+			setName(initialName);
+		}
+		onOpenChange(open);
+	};
+
+	const title = mode === "create" ? "Create checkpoint" : "Rename checkpoint";
+	const confirmLabel = mode === "create" ? "Create" : "Rename";
+
+	return (
+		<Dialog open={isOpen} onOpenChange={handleOpenChange}>
+			<DialogContent>
+				<DialogHeader>
+					<DialogTitle>{title}</DialogTitle>
+				</DialogHeader>
+
+				<DialogBody className="gap-3">
+					<Label>Name</Label>
+					<Input
+						value={name}
+						onChange={(e) => setName(e.target.value)}
+						onKeyDown={(e) => {
+							if (e.key === "Enter") {
+								e.preventDefault();
+								onConfirm(name);
+							}
+						}}
+						placeholder="e.g. Final cut"
+					/>
+				</DialogBody>
+
+				<DialogFooter>
+					<Button
+						variant="outline"
+						onClick={(e) => {
+							e.preventDefault();
+							e.stopPropagation();
+							onOpenChange(false);
+						}}
+					>
+						Cancel
+					</Button>
+					<Button onClick={() => onConfirm(name)}>{confirmLabel}</Button>
+				</DialogFooter>
+			</DialogContent>
+		</Dialog>
+	);
+}