refactor(web): consume DS primitives, remove local component copies

[austinpickett]

What does this PR do?

Replaces locally-forked UI components and hooks in the web dashboard with their
newly promoted counterparts from @nous-research/ui, reducing duplication and
centralizing shared UI primitives in the design system.

Depends on NousResearch/design-language#23 (merged, published as
@nous-research/ui@0.18.0), which promoted these primitives and consolidated
the dialogs onto Radix UI.

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 🔒 Security fix
• 📝 Documentation update
• ✅ Tests (adding or improving test coverage)
• ♻️ Refactor (no behavior change)
• 🎯 New skill (bundled or hub)

Changes Made

Bumped design-system dependency

• web/package.json: @nous-research/ui → 0.18.0 (the version that ships the
  promoted primitives + hooks)

Deleted local components (now in DS)

• web/src/components/ui/input.tsx
• web/src/components/ui/label.tsx
• web/src/components/ui/separator.tsx
• web/src/components/ui/card.tsx
• web/src/components/ui/confirm-dialog.tsx
• web/src/components/Toast.tsx
• web/src/components/BottomPickSheet.tsx
• web/src/components/NouiTypography.tsx

Deleted local hooks (now in DS)

• web/src/hooks/useToast.ts
• web/src/hooks/useBelowBreakpoint.ts
• web/src/hooks/useConfirmDelete.ts

Note: useModalBehavior was not promoted to the DS, so the local hook
(web/src/hooks/useModalBehavior.ts) is retained and its call sites continue
to import it locally.

Import updates

All imports updated to use DS deep import paths:

• @nous-research/ui/ui/components/{input,label,separator,card,confirm-dialog,toast,bottom-sheet}
• @nous-research/ui/ui/components/typography/index and .../typography/h2
• @nous-research/ui/hooks/{use-toast,use-below-breakpoint,use-confirm-delete}

How to Test

1. cd web && npm install
2. npm run build — type-checks (tsc -b) and builds clean
3. npm run dev — verify all pages render correctly
4. Test confirm dialogs (env page delete, config page reset)
5. Test toast notifications (save config, delete session)
6. Test theme/language switchers on narrow viewport (bottom sheet)
7. Test model picker dialog (models page)

Checklist

Code

• I've read the Contributing Guide
• My commit messages follow Conventional Commits
• I searched for existing PRs to make sure this isn't a duplicate
• My PR contains only changes related to this fix/feature (no unrelated commits)
• I've tested on my platform: WSL2 Ubuntu

Documentation & Housekeeping

• I've updated relevant documentation — or N/A
• I've updated cli-config.yaml.example if I added/changed config keys — or N/A
• I've updated CONTRIBUTING.md or AGENTS.md if I changed architecture or workflows — or N/A
• I've considered cross-platform impact — or N/A
• I've updated tool descriptions/schemas if I changed tool behavior — or N/A

Infographic

[github-actions]

🔎 Lint report: refactor/use-ds-primitives vs origin/main

ruff

Total: 0 on HEAD, 0 on base (➖ 0)

🆕 New issues: none

✅ Fixed issues: none

Unchanged: 0 pre-existing issues carried over.

ty (type checker)

Total: 9577 on HEAD, 9577 on base (➖ 0)

🆕 New issues: none

✅ Fixed issues: none

Unchanged: 5045 pre-existing issues carried over.

Diagnostics are surfaced as warnings — this check never fails the build.

[joechaotic]

I could not push directly to this branch from this checkout, so I opened a rebased replacement/fixup PR for the Nix failure here: #30749.\n\nRoot cause: the web refactor imports @nous-research/ui DS primitive subpaths that are not available from the locked package version in Nix. Fix updates @nous-research/ui/package-lock and keeps useModalBehavior local because that hook is not exported by the package. Verified with npm run build.

[austinpickett]

bugbot run

[cursor]

Skipping Bugbot: Unable to authenticate your request. Please make sure Bugbot is properly installed and configured for this repository.

[austinpickett]

Thanks @joechaotic — I've now applied that same fix directly on this branch, so #30749 should be redundant:

• Merged latest main and resolved conflicts (kept the DS-primitive imports).
• Bumped @nous-research/ui → 0.18.0 (the version that ships the promoted primitive subpaths + hooks).
• Kept useModalBehavior local since it isn't exported by the package; reverted those 3 import sites to @/hooks/useModalBehavior.
• Pointed Typography imports at .../typography/index (the folder index isn't resolvable via the bare .../typography subpath).
• Updated the stale nix/web.nix fetchNpmDeps hash for the new lockfile.

All CI is green now (both nix jobs, all 6 test shards, e2e, CodeQL, ruff). The only remaining blocker is the required team review that triggers because this PR touches package.json/package-lock.json.

Suggest we close #30749 in favor of this one