feat(onboarding): remove dead ends for new users (#55)

Registration shows the address used and can start over.
Confirm page says an admin approves; no login link.
Welcome puts next steps first; Steam link returns to the dashboard.
Dashboard and library explain an empty or private library.
First sync shows queued, polls slower up to 10 min, then a calm text.
Login: simple checks, resend offer after 401, password toggles.
Only a real expired link counts as invalid; typed passwords stay.
Default language follows the browser; texts are platform-neutral.

public/i18n/en.json

@@ -11,14 +11,17 @@
     "SUBMIT": "Enter the game",
     "NO_ACCOUNT": "No account yet?",
     "FORGOT_PASSWORD": "Forgot password?",
-    "ERROR_EMAIL": "Enter a valid email address with '@' and '.'.",
+    "ERROR_EMAIL": "Enter an email address with '@'.",
     "ERROR_PASSWORD": "The password must not be empty.",
     "ERROR_INVALID_CREDENTIALS": "Email or password is wrong.",
     "ERROR_TOO_MANY_ATTEMPTS": "Too many failed attempts. Please try again in {{minutes}} minutes.",
     "ERROR_GENERIC": "Login failed. Please try again later.",
     "SESSION_EXPIRED": "Your session has expired. Please log in again.",
     "ERROR_ACCOUNT_BLOCKED": "This account is blocked. Please contact the admin.",
-    "ERROR_ACCOUNT_PENDING": "Your registration is waiting for the admin. You will get an email once it is decided."
+    "ERROR_ACCOUNT_PENDING": "Your registration is waiting for the admin. You will get an email once it is decided.",
+    "NOT_CONFIRMED_HINT": "Not confirmed yet? Have the link sent again.",
+    "SHOW_PASSWORD": "Show password",
+    "HIDE_PASSWORD": "Hide password"
   },
   "REGISTRATION": {
     "TITLE": "Register",
@@ -26,7 +29,8 @@
     "PASSWORD": "Password",
     "PASSWORD_CONFIRMATION": "Confirm password",
     "SUBMIT": "Create account",
-    "SUCCESS": "We sent you an email. Click the link in it to confirm your address and choose your password; only then will the admin see your request.",
+    "SENT_TO": "We sent the link to {{email}}.",
+    "START_OVER": "Wrong address? Start over",
     "RESEND_EMAIL": "Email",
     "RESEND": "Send the link again",
     "RESEND_SENT": "If this address has an unconfirmed registration, a new link is on its way.",
@@ -49,6 +53,7 @@
     "DONE": "Your password has been changed. Log in with the new one.",
     "TO_LOGIN": "Log in",
     "INVALID": "This link is unknown, already used or older than 1 hour. Request a new one:",
+    "ERROR_REJECTED": "The server did not accept this password. Check the rules and try again.",
     "ERROR_TOO_MANY": "Too many attempts. Please try again in {{minutes}} minutes.",
     "ERROR_GENERIC": "That did not work. Please try again."
   },
@@ -56,9 +61,9 @@
     "TITLE": "Confirm your email address",
     "INTRO": "Choose a password to confirm your email address.",
     "SUBMIT": "Confirm",
-    "DONE": "Your address is confirmed. An admin will check your request; you will get an email once it is decided.",
+    "DONE": "Your address is confirmed. You get a mail once an admin has approved your account.",
     "INVALID": "This link is unknown, already used or older than 24 hours. Request a new one:",
-    "TO_LOGIN": "Log in"
+    "ERROR_REJECTED": "The server did not accept this password. Check the rules and try again."
   },
   "SETTINGS": {
     "PROFILE_STYLE": "Profile look",
@@ -211,6 +216,7 @@
     "EMAIL_INVALID": "Enter a valid email address.",
     "PASSWORD_TOO_SHORT": "Password must be at least 8 characters.",
     "PASSWORD_TOO_LONG": "Password is too long: at most 72 characters, fewer with umlauts or emoji.",
+    "PASSWORD_RULES": "At least 8 characters, at most 72 (fewer with umlauts or emoji).",
     "PASSWORD_CONFIRMATION_REQUIRED": "Please confirm your password.",
     "CURRENT_PASSWORD_REQUIRED": "Enter your current password.",
     "PASSWORD_MISMATCH": "Passwords do not match.",
@@ -225,12 +231,19 @@
   "DASHBOARD": {
     "LOADING": "Loading dashboard ...",
     "HELLO": "Hello",
-    "STEAM_GAMES": "Steam games",
+    "GAMES": "Games",
     "NO_STEAM_ID": "No Steam account linked yet – link it in the settings",
     "MOST_PLAYED": "Most played",
     "SHOW_ALL": "Show all",
     "TO_LIBRARY": "Go to library",
     "WELCOME_BACK": "Welcome back",
+    "WELCOME": "Welcome",
+    "EMPTY": {
+      "TITLE": "Your library is empty",
+      "NO_SOURCE": "Link a platform and we sync your games, or import a list.",
+      "LINK": "Link Steam / PlayStation",
+      "IMPORT": "Import games"
+    },
     "CURRENTLY_PLAYING": "Currently playing",
     "NOTHING_PLAYING": "Nothing right now. Set a game to \"Playing\".",
     "UP_NEXT": "Up next",
@@ -267,7 +280,8 @@
     "SOURCE": { "STEAM": "Steam", "PSN": "PlayStation", "MANUAL": "Manual" },
     "TITLE": "Game Library",
     "LOADING": "Loading games …",
-    "EMPTY": "No games yet. Sync your Steam library or add a game.",
+    "EMPTY": "No games yet. Link a platform, import a list or add a game.",
+    "EMPTY_PRIVATE": "The sync found no games. On Steam, \"Game details\" must be public: [Steam privacy settings](https://steamcommunity.com/my/edit/settings). Then sync again.",
     "ERROR_LOAD": "Could not load your games.",
     "COMING": "Out on {{date}}",
     "COMING_SOON": "Coming soon",
@@ -284,10 +298,13 @@
     "RESYNC": "Sync now",
     "SYNC_STARTED": "Sync started …",
     "SYNC_COOLDOWN": "Try again in {{seconds}}s",
-    "SYNCING": "Syncing with Steam …",
-    "SYNCING_FIRST_TIME": "First sync with Steam in progress. Your games will appear here shortly.",
+    "SYNCING": "Syncing your library …",
+    "SYNCING_FIRST_TIME": "First sync in progress. Your games will appear here shortly.",
+    "SYNC_QUEUED": "First sync queued …",
+    "SYNC_DURATION_HINT": "Usually under a minute, large libraries longer.",
     "SYNC_FAILED": "Sync failed. Please try again later.",
-    "SYNC_STALE": "The sync is taking longer than usual. Reload the page later.",
+    "SYNC_STALE": "The sync is still running. Large libraries need more time. Check back later.",
+    "SYNC_NOT_STARTED": "The first sync did not start. Try \"Sync now\".",
     "LAST_SYNCED": "Last synced {{when}}",
     "FILTER_ALL": "All",
     "SEARCH_PLACEHOLDER": "Search games …",
@@ -1035,8 +1052,9 @@
     "STEP_STEAM": "Link your Steam account",
     "STEP_IMPORT": "Import your games",
     "DONE": "Done",
-    "GO": "Let's go",
-    "SKIP": "Skip"
+    "GO": "Go to dashboard",
+    "ACTION_STEAM": "Link Steam",
+    "ACTION_IMPORT": "Import games"
   },
   "ADMIN_NEWS": {
     "NEW": "New entry",