feat(applications): job application tracker with AI copilot

Add an Applications module at /dashboard/applications: pipeline board
(dnd-kit), table view with bulk actions, Insights (fit tiles, funnel,
sources, shareable funnel-flow SVG), campaigns, tags, CSV import, and
Add/Edit/Detail slide-overs. Each application links a live Reactive
Resume.

AI "Application Copilot" (applications.ai.*): job-posting autofill,
resume↔job match score (fit ring), resume tailoring, and cover-letter /
follow-up drafting — via the user's configured provider.

Board cards + table rows get context menus (edit / move / archive /
delete). Charts are CSS/SVG (no new chart dep); adds a UI Checkbox.

Also includes local TanStack devtools setup and toolchain bumps.

Claude-Session: https://claude.ai/code/session_01TEeRHnEayw2MFCShFRyL5f

packages/ui/src/components/checkbox.tsx

@@ -0,0 +1,29 @@
+import { Checkbox as CheckboxPrimitive } from "@base-ui/react/checkbox";
+import { CheckIcon, MinusIcon } from "@phosphor-icons/react";
+import { cn } from "@reactive-resume/utils/style";
+
+function Checkbox({ className, ...props }: CheckboxPrimitive.Root.Props) {
+	return (
+		<CheckboxPrimitive.Root
+			data-slot="checkbox"
+			className={cn(
+				"peer flex size-4 shrink-0 items-center justify-center rounded-[4px] border border-input shadow-xs outline-none transition-shadow focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/50 aria-invalid:border-destructive data-disabled:cursor-not-allowed data-checked:border-primary data-indeterminate:border-primary data-checked:bg-primary data-indeterminate:bg-primary data-checked:text-primary-foreground data-indeterminate:text-primary-foreground data-disabled:opacity-50",
+				className,
+			)}
+			{...props}
+		>
+			<CheckboxPrimitive.Indicator
+				data-slot="checkbox-indicator"
+				className="flex items-center justify-center text-current"
+			>
+				{props.indeterminate ? (
+					<MinusIcon weight="bold" className="size-3" />
+				) : (
+					<CheckIcon weight="bold" className="size-3" />
+				)}
+			</CheckboxPrimitive.Indicator>
+		</CheckboxPrimitive.Root>
+	);
+}
+
+export { Checkbox };