Wire up i18n in both apps

Initialize i18n via initI18n() in both root.tsx files and replace all
hardcoded user-facing strings with useTranslation() calls. Adds missing
translation keys for planner (profiles, connection states, save flow)
and journal (auth pages, route management, passkey prompts).

Both English and German translations are complete.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/planner/app/components/ExportButton.tsx

@@ -1,10 +1,13 @@
 import { useCallback } from "react";
+import { useTranslation } from "react-i18next";
 import * as Y from "yjs";
 import type { YjsState } from "~/lib/use-yjs";
 import { generateGpx } from "@trails-cool/gpx";
 import type { TrackPoint } from "@trails-cool/gpx";
 
 export function ExportButton({ yjs }: { yjs: YjsState }) {
+  const { t } = useTranslation("planner");
+
   const handleExport = useCallback(() => {
     // Get waypoints from Yjs
     const waypoints = yjs.waypoints.toArray().map((yMap: Y.Map<unknown>) => ({
@@ -51,7 +54,7 @@ export function ExportButton({ yjs }: { yjs: YjsState }) {
       onClick={handleExport}
       className="rounded bg-gray-100 px-3 py-1 text-sm text-gray-700 hover:bg-gray-200"
     >
-      Export GPX
+      {t("exportGpx")}
     </button>
   );
 }

apps/planner/app/components/ProfileSelector.tsx

@@ -1,19 +1,15 @@
 import { useEffect, useState, useCallback } from "react";
+import { useTranslation } from "react-i18next";
 import type { YjsState } from "~/lib/use-yjs";
 
-const PROFILES = [
-  { id: "trekking", label: "Hiking" },
-  { id: "fastbike", label: "Cycling (fast)" },
-  { id: "safety", label: "Cycling (safe)" },
-  { id: "shortest", label: "Shortest" },
-  { id: "car-eco", label: "Car" },
-];
+const PROFILE_IDS = ["trekking", "fastbike", "safety", "shortest", "car"] as const;
 
 interface ProfileSelectorProps {
   yjs: YjsState;
 }
 
 export function ProfileSelector({ yjs }: ProfileSelectorProps) {
+  const { t } = useTranslation("planner");
   const [profile, setProfile] = useState("trekking");
 
   useEffect(() => {
@@ -38,7 +34,7 @@ export function ProfileSelector({ yjs }: ProfileSelectorProps) {
   return (
     <div className="flex items-center gap-2">
       <label htmlFor="profile" className="text-sm text-gray-600">
-        Profile:
+        {t("profile")}:
       </label>
       <select
         id="profile"
@@ -46,9 +42,9 @@ export function ProfileSelector({ yjs }: ProfileSelectorProps) {
         onChange={handleChange}
         className="rounded border border-gray-300 bg-white px-2 py-1 text-sm focus:border-blue-500 focus:outline-none focus:ring-1 focus:ring-blue-500"
       >
-        {PROFILES.map((p) => (
-          <option key={p.id} value={p.id}>
-            {p.label}
+        {PROFILE_IDS.map((id) => (
+          <option key={id} value={id}>
+            {t(`profiles.${id}`)}
           </option>
         ))}
       </select>

apps/planner/app/components/SaveToJournalButton.tsx

@@ -1,4 +1,5 @@
 import { useState, useCallback } from "react";
+import { useTranslation } from "react-i18next";
 import * as Y from "yjs";
 import type { YjsState } from "~/lib/use-yjs";
 import { generateGpx } from "@trails-cool/gpx";
@@ -12,6 +13,7 @@ interface SaveToJournalButtonProps {
 }
 
 export function SaveToJournalButton({ yjs, callbackUrl, callbackToken, returnUrl }: SaveToJournalButtonProps) {
+  const { t } = useTranslation("planner");
   const [saving, setSaving] = useState(false);
   const [saved, setSaved] = useState(false);
   const [error, setError] = useState<string | null>(null);
@@ -72,13 +74,13 @@ export function SaveToJournalButton({ yjs, callbackUrl, callbackToken, returnUrl
         disabled={saving}
         className="rounded bg-green-600 px-3 py-1 text-sm text-white hover:bg-green-700 disabled:opacity-50"
       >
-        {saving ? "Saving..." : "Save to Journal"}
+        {saving ? t("saving") : t("saveToJournal")}
       </button>
-      {saved && <span className="text-xs text-green-600">Saved!</span>}
+      {saved && <span className="text-xs text-green-600">{t("saved")}</span>}
       {error && <span className="text-xs text-red-600">{error}</span>}
       {saved && returnUrl && (
         <a href={returnUrl} className="rounded bg-gray-100 px-2 py-1 text-xs text-gray-700 hover:bg-gray-200">
-          Return to Journal
+          {t("returnToJournal")}
         </a>
       )}
     </div>

apps/planner/app/components/SessionView.tsx

@@ -1,4 +1,5 @@
 import { Suspense, lazy, useState, useCallback } from "react";
+import { useTranslation } from "react-i18next";
 import { useYjs } from "~/lib/use-yjs";
 import { useRouting } from "~/lib/use-routing";
 import { ProfileSelector } from "~/components/ProfileSelector";
@@ -25,6 +26,7 @@ interface SessionViewProps {
 }
 
 export function SessionView({ sessionId, callbackUrl, callbackToken, returnUrl, initialWaypoints }: SessionViewProps) {
+  const { t } = useTranslation("planner");
   const yjs = useYjs(sessionId, initialWaypoints);
   const { isHost, computing, routeStats, requestRoute } = useRouting(yjs);
   const [highlightPosition, setHighlightPosition] = useState<[number, number] | null>(null);
@@ -36,7 +38,7 @@ export function SessionView({ sessionId, callbackUrl, callbackToken, returnUrl,
   if (!yjs) {
     return (
       <div className="flex h-full items-center justify-center">
-        <p className="text-gray-500">Connecting...</p>
+        <p className="text-gray-500">{t("connecting")}</p>
       </div>
     );
   }
@@ -45,7 +47,7 @@ export function SessionView({ sessionId, callbackUrl, callbackToken, returnUrl,
     <>
       <header className="flex flex-wrap items-center justify-between gap-2 border-b border-gray-200 px-4 py-2">
         <div className="flex items-center gap-2 md:gap-4">
-          <h1 className="hidden text-lg font-semibold text-gray-900 sm:block">trails.cool Planner</h1>
+          <h1 className="hidden text-lg font-semibold text-gray-900 sm:block">{t("title")}</h1>
           <ProfileSelector yjs={yjs} />
         </div>
         <div className="flex items-center gap-3">
@@ -59,15 +61,15 @@ export function SessionView({ sessionId, callbackUrl, callbackToken, returnUrl,
           )}
           <ExportButton yjs={yjs} />
           {computing && (
-            <span className="text-xs text-blue-600">Computing route...</span>
+            <span className="text-xs text-blue-600">{t("computingRoute")}</span>
           )}
           {isHost && (
             <span className="rounded-full bg-green-100 px-2 py-0.5 text-xs text-green-700">
-              Host
+              {t("host")}
             </span>
           )}
           <span className="text-sm text-gray-500">
-            {yjs.connected ? "Connected" : "Connecting..."} · {sessionId.slice(0, 8)}
+            {yjs.connected ? t("connected") : t("connecting")} · {sessionId.slice(0, 8)}
           </span>
         </div>
       </header>
@@ -84,7 +86,7 @@ export function SessionView({ sessionId, callbackUrl, callbackToken, returnUrl,
             <Suspense
               fallback={
                 <div className="flex h-full items-center justify-center bg-gray-100 text-gray-500">
-                  Loading map...
+                  {t("loadingMap")}
                 </div>
               }
             >