feat: add admin dashboard app (#91)

* feat: add admin dashboard app

- React + Vite + TanStack Router + TanStack Query
- Auth with better-auth (login, session, admin guard)
- Source config management (WeatherKit credentials, user config)
- Feed query panel
- Location push card
- General settings with health check
- CORS middleware for cross-origin auth
- Disable CSRF check in dev mode
- Sonner toasts for mutation feedback

Co-authored-by: Ona <no-reply@ona.com>

* fix: use useQuery instead of getQueryData

Co-authored-by: Ona <no-reply@ona.com>

* refactor: remove backend changes from dashboard PR

Backend CORS/CSRF changes moved to #92.
Source registry removed (sources hardcoded in frontend).

Co-authored-by: Ona <no-reply@ona.com>

---------

Co-authored-by: Ona <no-reply@ona.com>

apps/admin-dashboard/src/components/theme-provider.tsx

@@ -0,0 +1,230 @@
+/* eslint-disable react-refresh/only-export-components */
+import * as React from "react"
+
+type Theme = "dark" | "light" | "system"
+type ResolvedTheme = "dark" | "light"
+
+type ThemeProviderProps = {
+  children: React.ReactNode
+  defaultTheme?: Theme
+  storageKey?: string
+  disableTransitionOnChange?: boolean
+}
+
+type ThemeProviderState = {
+  theme: Theme
+  setTheme: (theme: Theme) => void
+}
+
+const COLOR_SCHEME_QUERY = "(prefers-color-scheme: dark)"
+const THEME_VALUES: Theme[] = ["dark", "light", "system"]
+
+const ThemeProviderContext = React.createContext<
+  ThemeProviderState | undefined
+>(undefined)
+
+function isTheme(value: string | null): value is Theme {
+  if (value === null) {
+    return false
+  }
+
+  return THEME_VALUES.includes(value as Theme)
+}
+
+function getSystemTheme(): ResolvedTheme {
+  if (window.matchMedia(COLOR_SCHEME_QUERY).matches) {
+    return "dark"
+  }
+
+  return "light"
+}
+
+function disableTransitionsTemporarily() {
+  const style = document.createElement("style")
+  style.appendChild(
+    document.createTextNode(
+      "*,*::before,*::after{-webkit-transition:none!important;transition:none!important}"
+    )
+  )
+  document.head.appendChild(style)
+
+  return () => {
+    window.getComputedStyle(document.body)
+    requestAnimationFrame(() => {
+      requestAnimationFrame(() => {
+        style.remove()
+      })
+    })
+  }
+}
+
+function isEditableTarget(target: EventTarget | null) {
+  if (!(target instanceof HTMLElement)) {
+    return false
+  }
+
+  if (target.isContentEditable) {
+    return true
+  }
+
+  const editableParent = target.closest(
+    "input, textarea, select, [contenteditable='true']"
+  )
+  if (editableParent) {
+    return true
+  }
+
+  return false
+}
+
+export function ThemeProvider({
+  children,
+  defaultTheme = "system",
+  storageKey = "theme",
+  disableTransitionOnChange = true,
+  ...props
+}: ThemeProviderProps) {
+  const [theme, setThemeState] = React.useState<Theme>(() => {
+    const storedTheme = localStorage.getItem(storageKey)
+    if (isTheme(storedTheme)) {
+      return storedTheme
+    }
+
+    return defaultTheme
+  })
+
+  const setTheme = React.useCallback(
+    (nextTheme: Theme) => {
+      localStorage.setItem(storageKey, nextTheme)
+      setThemeState(nextTheme)
+    },
+    [storageKey]
+  )
+
+  const applyTheme = React.useCallback(
+    (nextTheme: Theme) => {
+      const root = document.documentElement
+      const resolvedTheme =
+        nextTheme === "system" ? getSystemTheme() : nextTheme
+      const restoreTransitions = disableTransitionOnChange
+        ? disableTransitionsTemporarily()
+        : null
+
+      root.classList.remove("light", "dark")
+      root.classList.add(resolvedTheme)
+
+      if (restoreTransitions) {
+        restoreTransitions()
+      }
+    },
+    [disableTransitionOnChange]
+  )
+
+  React.useEffect(() => {
+    applyTheme(theme)
+
+    if (theme !== "system") {
+      return undefined
+    }
+
+    const mediaQuery = window.matchMedia(COLOR_SCHEME_QUERY)
+    const handleChange = () => {
+      applyTheme("system")
+    }
+
+    mediaQuery.addEventListener("change", handleChange)
+
+    return () => {
+      mediaQuery.removeEventListener("change", handleChange)
+    }
+  }, [theme, applyTheme])
+
+  React.useEffect(() => {
+    const handleKeyDown = (event: KeyboardEvent) => {
+      if (event.repeat) {
+        return
+      }
+
+      if (event.metaKey || event.ctrlKey || event.altKey) {
+        return
+      }
+
+      if (isEditableTarget(event.target)) {
+        return
+      }
+
+      if (event.key.toLowerCase() !== "d") {
+        return
+      }
+
+      setThemeState((currentTheme) => {
+        const nextTheme =
+          currentTheme === "dark"
+            ? "light"
+            : currentTheme === "light"
+              ? "dark"
+              : getSystemTheme() === "dark"
+                ? "light"
+                : "dark"
+
+        localStorage.setItem(storageKey, nextTheme)
+        return nextTheme
+      })
+    }
+
+    window.addEventListener("keydown", handleKeyDown)
+
+    return () => {
+      window.removeEventListener("keydown", handleKeyDown)
+    }
+  }, [storageKey])
+
+  React.useEffect(() => {
+    const handleStorageChange = (event: StorageEvent) => {
+      if (event.storageArea !== localStorage) {
+        return
+      }
+
+      if (event.key !== storageKey) {
+        return
+      }
+
+      if (isTheme(event.newValue)) {
+        setThemeState(event.newValue)
+        return
+      }
+
+      setThemeState(defaultTheme)
+    }
+
+    window.addEventListener("storage", handleStorageChange)
+
+    return () => {
+      window.removeEventListener("storage", handleStorageChange)
+    }
+  }, [defaultTheme, storageKey])
+
+  const value = React.useMemo(
+    () => ({
+      theme,
+      setTheme,
+    }),
+    [theme, setTheme]
+  )
+
+  return (
+    <ThemeProviderContext.Provider {...props} value={value}>
+      {children}
+    </ThemeProviderContext.Provider>
+  )
+}
+
+export const useTheme = () => {
+  const context = React.useContext(ThemeProviderContext)
+
+  if (context === undefined) {
+    throw new Error("useTheme must be used within a ThemeProvider")
+  }
+
+  return context
+}