feat: migrate UI layer to coss.com/ui (Base UI)

[devin-ai-integration]

Summary

Swaps the UI primitive layer from Radix UI → coss.com/ui (shadcn-style components built on Base UI), keeping all app features (coords, geocoding, map, custom theming, i18n, widgets) intact. No app logic, state, or Rust/Tauri backend changes; version left untouched.

The bulk of the work is adapting consumers to Base UI's API, which differs from Radix:

• asChild → render prop. Radix wrapped a child; Base UI takes a JSX element on render. Triple-nested cases (tooltip → toolbar → button) nest render:

  - <TooltipTrigger asChild><Toolbar.Button asChild><Button .../></Toolbar.Button></TooltipTrigger>
  + <TooltipTrigger render={<ToolbarButton render={<Button .../>} />} />

• Command → Autocomplete. coss Command is an Autocomplete alias; items are passed as an array and CommandList takes a render function; selection moved from onSelect → onClick. Applied to theme-selector and language-selector.

  - <Command><CommandGroup>{items.map(i => <CommandItem onSelect=.../>)}</CommandGroup></Command>
  + <Command items={items}><CommandList>{(i) => <CommandItem onClick=.../>}</CommandList></Command>

• Popover sizing --radix-popover-trigger-width → --anchor-width; dropped Radix-only collisionPadding/avoidCollisions.
• TooltipProvider delayDuration → delay.
• Toolbar @radix-ui/react-toolbar → coss Toolbar/ToolbarButton (edit/marker/selection toolbars).
• color-picker hue slider rebuilt on Base UI slider (@base-ui/react/slider) instead of radix-ui.

Stack cleanup:

• Removed unused deps: radix-ui, @radix-ui/react-{scroll-area,select,separator,slot,toolbar}, cmdk.
• Bundled Inter + Geist Mono via @fontsource-variable/* (offline desktop app) and wired --font-sans / --font-mono design tokens.
• Added build.rollupOptions.output.manualChunks (icons/vendor/motion/dnd; leaflet kept in the lazy map-panel chunk) + chunkSizeWarningLimit, eliminating the bundle-size warning. lucide-react stays fully bundled on purpose — themes resolve their icon by name at runtime.

The sonner toast wrapper already maps to the design tokens (--popover, --border, --radius), so it's kept as-is.

Verification

• bun run lint, bun run vite:build (tsc + vite) pass with no warnings.
• Smoke-tested the web layer (bun run vite:dev): settings panel, Base UI Selects, migrated Command theme selector (switched Dark → Light), language selector, and switch all render and work; console clean.

Note: full app run requires the Tauri desktop bridge; the dev-server smoke test shows the expected "waiting for Tauri" sidebar state.

Link to Devin session: https://app.devin.ai/sessions/96349a14345f42beb48c8282af8425a8
Requested by: @wiktorekdev

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment, CI, and merge conflict monitoring

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
geohelper	Ready	Preview, Comment	May 30, 2026 1:03pm

[wiktorekdev]

leaving this for later cuz it has a lot of bugs to fix