fix(oxibadge): show connection errors instead of failing silently

load_records/load_employees failures were only logged to the console
and silently reset the UI to the month picker. Errors now flow through
a shared store (src/lib/error.ts) into an ErrorBanner, reused by both
Onboarding and ConfirmMonth, with the raw message passed straight
through from Rust (no stable-code classification layer — these are
mostly plain I/O errors, not worth categorizing).

i18n stays grouped per screen as before, with error-related strings
split into their own top-level "errors" group.

Assisted-by: Claude Sonnet 5 <noreply@anthropic.com>

oxibadge/src-tauri/src/lib.rs

@@ -22,27 +22,15 @@ async fn test_connection(host: String, port: u16) -> Result<(), String> {
     connect_with_retries(&host, port).await.map(|_| ())
 }
 
-/// Connects to the device, trying up to 3 times, returning a stable error
-/// code (not a user-facing message) on failure so the frontend can
-/// translate it.
+/// Connects to the device, trying up to 3 times, returning the last error
+/// message as-is on failure.
 async fn connect_with_retries(host: &str, port: u16) -> Result<R701, String> {
     let mut last_error = String::new();
     for _ in 0..3 {
-        let err = match R701::connect((host, port)).await {
+        match R701::connect((host, port)).await {
             Ok(r701) => return Ok(r701),
-            Err(err) => err,
-        };
-        last_error = match err.kind() {
-            std::io::ErrorKind::ConnectionRefused => "connection-refused".to_string(),
-            std::io::ErrorKind::TimedOut => "timed-out".to_string(),
-            _ if err
-                .to_string()
-                .contains("failed to lookup address information") =>
-            {
-                "dns-failure".to_string()
-            }
-            _ => "unknown".to_string(),
-        };
+            Err(err) => last_error = err.to_string(),
+        }
     }
     Err(last_error)
 }

oxibadge/src/lib/components/ConfirmMonth.svelte

@@ -2,9 +2,11 @@
   import { tick } from 'svelte';
   import { _, locale } from 'svelte-i18n';
   import { monthName } from '$lib/month';
+  import { error, clearError } from '$lib/error';
   import Column from './Column.svelte';
   import Intro from './Intro.svelte';
   import Button from './Button.svelte';
+  import ErrorBanner from './ErrorBanner.svelte';
 
   let { onstart }: { onstart: (selection: { year: number; month: number }) => void } = $props();
 
@@ -46,12 +48,14 @@
     if (isFuture(i)) return;
     month = i;
     open = null;
+    clearError();
   }
 
   function pickYear(y: number) {
     year = y;
     if (y === currentYear && month > currentMonth) month = currentMonth;
     open = null;
+    clearError();
   }
 
   function onYearScroll() {
@@ -157,6 +161,10 @@
   </div>
 
   <Button label={$_('confirm_month.button')} onclick={start} />
+
+  {#if $error}
+    <ErrorBanner title={$_('errors.title')} message={$error} />
+  {/if}
 </Column>
 
 <style>

oxibadge/src/lib/components/Onboarding.svelte

@@ -1,6 +1,7 @@
 <script lang="ts">
   import { invoke } from '@tauri-apps/api/core';
   import { _ } from 'svelte-i18n';
+  import { error, setError, clearError } from '$lib/error';
   import Column from './Column.svelte';
   import Intro from './Intro.svelte';
   import Field from './Field.svelte';
@@ -10,40 +11,29 @@
 
   let { onconnected }: { onconnected: (cfg: { host: string; port: number }) => void } = $props();
 
-  type Phase = 'idle' | 'testing' | 'err';
-
   let host = $state('');
   let port = $state(5005);
-  let phase = $state<Phase>('idle');
-  let errorCode = $state('');
+  let testing = $state(false);
 
   const trimmedHost = $derived(host.trim());
   const empty = $derived(trimmedHost === '');
-  const disabled = $derived(empty || phase === 'testing');
+  const disabled = $derived(empty || testing);
   const btnLabel = $derived(
-    phase === 'testing'
-      ? $_('onboarding.button.testing')
-      : phase === 'err'
-        ? $_('onboarding.button.retry')
-        : $_('onboarding.button.idle')
+    testing ? $_('onboarding.button.testing') : $error ? $_('onboarding.button.retry') : $_('onboarding.button.idle')
   );
 
-  function resetPhase() {
-    phase = 'idle';
-    errorCode = '';
-  }
-
   async function testAndSave() {
     if (disabled) return;
-    phase = 'testing';
-    errorCode = '';
+    testing = true;
+    clearError();
     try {
       await invoke('test_connection', { host: trimmedHost, port });
       await invoke('save_preferences', { host: trimmedHost, port });
       onconnected({ host: trimmedHost, port });
     } catch (err) {
-      errorCode = String(err);
-      phase = 'err';
+      setError(err);
+    } finally {
+      testing = false;
     }
   }
 </script>
@@ -64,7 +54,7 @@
         label={$_('onboarding.host_label')}
         bind:value={host}
         placeholder="192.168.1.100"
-        oninput={resetPhase}
+        oninput={clearError}
       >
         {#snippet icon()}
           <svg width="18" height="18" viewBox="0 0 24 24" aria-hidden="true">
@@ -79,14 +69,14 @@
         bind:value={port}
         type="number"
         placeholder="5005"
-        oninput={resetPhase}
+        oninput={clearError}
       />
     </div>
 
-    <Button type="submit" label={btnLabel} faded={empty} busy={phase === 'testing'} {disabled} />
+    <Button type="submit" label={btnLabel} faded={empty} busy={testing} {disabled} />
 
-    {#if phase === 'err'}
-      <ErrorBanner title={$_('onboarding.error_title')} message={$_(`onboarding.errors.${errorCode}`)} />
+    {#if $error}
+      <ErrorBanner title={$_('errors.title')} message={$error} />
     {/if}
 
     <Hint text={$_('onboarding.hint')} />

oxibadge/src/lib/error.ts

@@ -0,0 +1,11 @@
+import { writable } from 'svelte/store';
+
+export const error = writable('');
+
+export function setError(err: unknown) {
+  error.set(String(err));
+}
+
+export function clearError() {
+  error.set('');
+}

oxibadge/src/lib/locales/en.json

@@ -10,13 +10,6 @@
       "idle": "Test connection",
       "testing": "Connecting...",
       "retry": "Retry"
-    },
-    "error_title": "Could not reach the time clock",
-    "errors": {
-      "connection-refused": "Connection refused",
-      "timed-out": "Connection timed out",
-      "dns-failure": "Invalid or unreachable address",
-      "unknown": "Connection error"
     }
   },
   "confirm_month": {
@@ -38,6 +31,9 @@
     "title": "Fetching employees...",
     "description": "Reading the employee names registered on the time clock. Just a moment."
   },
+  "errors": {
+    "title": "Could not reach the time clock"
+  },
   "done": {
     "message": "Nothing to do here."
   }

oxibadge/src/lib/locales/it.json

@@ -10,13 +10,6 @@
       "idle": "Testa connessione",
       "testing": "Connessione in corso...",
       "retry": "Riprova"
-    },
-    "error_title": "Impossibile raggiungere il timbratore",
-    "errors": {
-      "connection-refused": "Connessione rifiutata",
-      "timed-out": "Connessione scaduta",
-      "dns-failure": "Indirizzo non valido o non raggiungibile",
-      "unknown": "Errore di connessione"
     }
   },
   "confirm_month": {
@@ -38,6 +31,9 @@
     "title": "Recupero i dipendenti...",
     "description": "Sto leggendo i nomi dei dipendenti registrati sul timbratore. Ci vuole solo un attimo."
   },
+  "errors": {
+    "title": "Impossibile raggiungere il timbratore"
+  },
   "done": {
     "message": "Non c'è niente da fare."
   }

oxibadge/src/routes/+page.svelte

@@ -3,6 +3,7 @@
   import { onMount } from 'svelte';
   import { _, locale } from 'svelte-i18n';
   import { monthName } from '$lib/month';
+  import { setError, clearError } from '$lib/error';
   import Screen from '$lib/components/Screen.svelte';
   import Onboarding from '$lib/components/Onboarding.svelte';
   import ConfirmMonth from '$lib/components/ConfirmMonth.svelte';
@@ -25,13 +26,14 @@
     selectedYear = selection.year;
     selectedMonth = selection.month;
     step = 'loading-records';
+    clearError();
     try {
       const records = await invoke('load_records', selection);
       step = 'loading-employees';
       await invoke('load_employees', { records });
       step = 'done';
     } catch (err) {
-      console.error(err);
+      setError(err);
       step = 'confirm-month';
     }
   }