fix(dialog): non-modal coexistence, drag-safe outside presses, accessible-name warning

[ivanbanov]

Three dialog fixes from a behavior audit against the SPECs. Each decision lives once in @dunky.dev/dom-dialog; the React and Solid bindings only plumb refs and lifecycles.

1 · A non-modal dialog no longer blocks the page

Dialog.Viewport is a full-coverage layer, so even with no backdrop rendered it swallowed every press aimed at the page beneath — the page element never received it, and the dialog dismissed instead, against the core contract that a non-modal dialog coexists with the page. While modal={false} the Viewport now renders pointer-events: none and the window pointer-events: auto (the consumer's own style wins over both). Detection moves with it: a transparent Viewport never receives the press it used to detect, so watchOutsidePress observes at the document level — the only vantage point that sees both the portaled dialog and the page — with the same refusals as the element path: topmost dialog only, the window excepted, and the trigger excepted so its own press stays a plain toggle instead of a close-and-reopen.

2 · A text-selection drag no longer dismisses

A mousedown inside the window with a mouseup outside it makes the browser fire click on their common ancestor — the viewport or backdrop — indistinguishable from a genuine outside press by the click's target alone. Selecting text across the window's edge closed the dialog and lost the form state with it. Where a press began now decides: trackPressOrigin captures each press's origin at pointerdown, before the collapse, and acceptsBackdropPress / acceptsViewportPress take a startedInside argument and refuse a gesture that started inside the window.

3 · A nameless dialog warns

The core contract — a rendered Title, or aria-label/aria-labelledby on Content, never neither (APG: dialogs require an accessible name) — was documented but unenforced. openDialogLayer now checks the window's own attributes on open and warns with the fix, the same loud treatment the stranded-focus miss already gets. The check reads the DOM rather than the machine's Title-presence flag (a label may arrive through a prop spread), defers a macrotask so a rendered Title's registration commits first, and is cancelled by the close.

Cross-scope

• SPECs: the behavior contract (drag rule, trigger exception, non-modal coexistence) went to the core SPEC; mechanics to dom-dialog; part defaults to both substrate SPECs. closeOnInteractOutside descriptions updated to match the new mechanism.
• Stories: the containment story's nested non-modal panel gains correct light-dismiss; its copy now says so, mirrored in both substrates.
• Tests: 27 new — drag scenarios (viewport, backdrop, document), the non-modal suite (fall-through styles, document dismiss, trigger single-toggle), trackPressOrigin / watchOutsidePress units, and the name-warning cases. Two test-infra bugs fixed along the way: the name-check timer leaked past close (now cleared in the disposer), and both substrate test files accumulated console.warn spy history across tests (now restoreAllMocks per test, matching the dom file's convention).
• Native: untouched — it already satisfies the drag rule structurally (a Pressable's press must start and end on it) and solved the fall-through with pointerEvents="box-none".
• Changesets: one per story — dom-dialog minor ×2 + patch, react/solid-dialog patch.

Gate: 308 tests across 16 files, typecheck (base + solid), oxlint, oxfmt — all clean.

🤖 Generated with Claude Code

[ivanbanov]

Follow-up commit: the reusable parts moved to their long-term homes before review — trackPressOrigin is now its own util (@dunky.dev/dom-press-origin, new package: every light-dismissable layer needs the drag guard, and it imports nothing), and watchOutsidePress moved into @dunky.dev/dom-overlay, next to the layer stack it queries, with layer-generic vocabulary (element, not content). viewportPointerEvents/contentPointerEvents stay in dom-dialog — they are values for dialog parts. Substrates import the utils directly per the boundary; changesets and SPECs updated (new package SPEC included). Gates re-run: 308 tests across 18 files, typecheck, lint, format, and pnpm build (publint) all green.