4265ac876c
Review found three scroll containers sitting on surfaces the rebinding contract covers, none of which rebound: ui-primitives' shared Menu card on --dsw-specific-menu (the surface PopupSelectView already rebinds for), and the composer input and question composer cards, both on --dsw-specific-input-major. Each rendered the l1 thumb, which differs from l2 only in the dark palette and only on that surface, so a light-palette screenshot and a code read both look correct. Adds the mechanical check that would have caught them instead of leaving it to inspection: a sheet that scrolls somewhere and paints a known elevated surface somewhere must rebind. The elevated set is derived from the sheets that already rebind, since a rebinding rule paints the surface whose elevation it declares, so a new elevated surface joins the set by rebinding rather than by anyone updating a list. Surface-level rather than element-level because the card and the descendant that scrolls are separate rules and CSS text does not say which contains which. Verified by reverting each of the three fixes in turn: the check names the sheet and the surface every time. Also commits snapshots/sidebar-scrollbar/geometry.expected.md, the resolved scrollbar style and geometry in both palettes. The aria goldens the other web scenarios commit cannot carry a CSS-only change, since it alters no DOM and no accessible name and leaves their trees byte-identical. Absolute coordinates stay out: they track font metrics and the laid-out sidebar width, so committing them would document the platform and force a per-platform re-record.
@deepseek-ai/dsh-client-ui-theme
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Theme plugin: ThemeService over the --dsw-* token base stylesheets (static scale + alias semantic layers). The service owns the theme preference (light/dark/system, persisted under dsh.theme), resolves system through prefers-color-scheme, and publishes immutable ThemeSnapshots on the theme/change event; it never touches the DOM — ui-layout's presenter applies the resolved snapshot (html { color-scheme }, body[data-ds-dark-theme], and inline alias tokens). Contract: api-contracts v3 §8.
src/styles/ holds five sheets, all imported by the web shell's base.css: base.css, design-platform.css, scrollbar.css, gradient-shadow-text.css, and shiki.css. scrollbar.css is the sole consumer of the --dsw-alias-scrollbar-* tokens and must follow design-platform.css, which declares them.
Scrollbar rebinding contract: scrollbar.css binds --dsh-scrollbar-thumb and --dsh-scrollbar-thumb-hover on body to the l1 (base-surface) tokens, and both rendering paths read that pair. An elevated surface (menu, popover, dialog) sets --dsh-scrollbar-thumb: var(--dsw-alias-scrollbar-bg-l2) and --dsh-scrollbar-thumb-hover: var(--dsw-alias-scrollbar-hover-l2) on its own container; one rebind retints whichever path the engine took.
The two paths are mutually exclusive by construction. scrollbar-width/scrollbar-color sit inside @supports not selector(::-webkit-scrollbar) because a non-auto value of either makes Chromium and Safari discard every ::-webkit-scrollbar* rule for that element, ::-webkit-scrollbar-thumb:hover included — declaring both unconditionally leaves --dsh-scrollbar-thumb-hover with no rendering anywhere. Firefox therefore takes the standard properties and WebKit-based engines take the pseudo-elements, so the hover token only ever renders through the pseudo-element path. Reasoning and the measured computed values: the scrollbar Agent Note.
Model Experience
None, as the theme service manages a browser preference; nothing here reaches a model request.
KV Cache effect
None; this package neither assembles nor sends a provider request.
Known Limitations and Deferred Work
- Third-party themes are a surface, not a product — registering one means overriding same-named alias variables; no validation exists that an override set is complete.
- The token sheets are the sole color authority — values absent from cssdesign (for example the design's #4176E6 tab blue) are deliberately not appended; the nearest semantic token wins (arbitrated 2026-07-22).