feat(i18n): add Phase 3 observability translations (EN + PL)

Added translations for all observability components:
- Validation warnings panel
- Auto-fixes badge
- AI reasoning process viewer
- Debug information panel
- Structured error display

English translations (en.json):
- observability_validationWarnings: "Validation Warnings"
- observability_autoFixesApplied: "Automatically adjusted"
- observability_aiReasoningProcess: "AI Reasoning Process"
- observability_debugInfo: "Debug Information"
- observability_model/duration/tokenUsage: Debug panel labels
- observability_validationFailed: "Safety validation failed"

Polish translations (pl.json):
- observability_validationWarnings: "Ostrzeżenia walidacji"
- observability_autoFixesApplied: "Automatycznie dostosowano"
- observability_aiReasoningProcess: "Proces rozumowania AI"
- observability_debugInfo: "Informacje debugowania"
- All debug panel labels translated
- observability_validationFailed: "Walidacja bezpieczeństwa nie powiodła się"

Updated components:
- ValidationWarningsAlert: Uses m.observability_validationWarnings()
- AutoFixBadge: Uses m.observability_autoFixesApplied()
- ReasoningChainViewer: Uses m.observability_aiReasoningProcess()
- MetadataDebugPanel: All labels now use i18n
- StructuredErrorDisplay: Translates error prefixes

All components now fully support English and Polish locales.

frontend/messages/en.json

@@ -216,6 +216,21 @@
   "suggest_summaryConstraints": "Constraints",
   "suggest_stepOptionalBadge": "optional",
 
+  "observability_validationWarnings": "Validation Warnings",
+  "observability_showMore": "Show {count} more",
+  "observability_showLess": "Show less",
+  "observability_autoFixesApplied": "Automatically adjusted",
+  "observability_aiReasoningProcess": "AI Reasoning Process",
+  "observability_debugInfo": "Debug Information",
+  "observability_model": "Model",
+  "observability_duration": "Duration",
+  "observability_tokenUsage": "Token Usage",
+  "observability_tokenPrompt": "Prompt",
+  "observability_tokenCompletion": "Completion",
+  "observability_tokenThinking": "Thinking",
+  "observability_tokenTotal": "Total",
+  "observability_validationFailed": "Safety validation failed",
+
   "medications_title": "Medications",
   "medications_count": [
     {

frontend/messages/pl.json

@@ -222,6 +222,21 @@
   "suggest_summaryConstraints": "Ograniczenia",
   "suggest_stepOptionalBadge": "opcjonalny",
 
+  "observability_validationWarnings": "Ostrzeżenia walidacji",
+  "observability_showMore": "Pokaż {count} więcej",
+  "observability_showLess": "Pokaż mniej",
+  "observability_autoFixesApplied": "Automatycznie dostosowano",
+  "observability_aiReasoningProcess": "Proces rozumowania AI",
+  "observability_debugInfo": "Informacje debugowania",
+  "observability_model": "Model",
+  "observability_duration": "Czas trwania",
+  "observability_tokenUsage": "Użycie tokenów",
+  "observability_tokenPrompt": "Prompt",
+  "observability_tokenCompletion": "Odpowiedź",
+  "observability_tokenThinking": "Myślenie",
+  "observability_tokenTotal": "Razem",
+  "observability_validationFailed": "Walidacja bezpieczeństwa nie powiodła się",
+
   "medications_title": "Leki",
   "medications_count": [
     {

frontend/src/lib/components/AutoFixBadge.svelte

@@ -1,5 +1,6 @@
 <script lang="ts">
 	import { Sparkles } from 'lucide-svelte';
+	import { m } from '$lib/paraglide/messages.js';
 
 	interface Props {
 		autoFixes: string[];
@@ -13,7 +14,7 @@
 		<div class="flex items-start gap-2">
 			<Sparkles class="size-5 shrink-0 mt-0.5" />
 			<div class="flex-1">
-				<p class="font-medium mb-1">Automatically adjusted</p>
+				<p class="font-medium mb-1">{m.observability_autoFixesApplied()}</p>
 				<ul class="list-disc list-inside space-y-1 text-sm">
 					{#each autoFixes as fix}
 						<li>{fix}</li>

frontend/src/lib/components/MetadataDebugPanel.svelte

@@ -1,5 +1,6 @@
 <script lang="ts">
 	import { Info, ChevronDown, ChevronRight } from 'lucide-svelte';
+	import { m } from '$lib/paraglide/messages.js';
 	import type { ResponseMetadata } from '$lib/types';
 
 	interface Props {
@@ -23,7 +24,7 @@
 			class="w-full flex items-center gap-2 px-4 py-3 bg-muted/30 hover:bg-muted/50 transition-colors"
 		>
 			<Info class="size-4 text-muted-foreground" />
-			<span class="text-sm font-medium text-foreground">Debug Information</span>
+			<span class="text-sm font-medium text-foreground">{m.observability_debugInfo()}</span>
 			<div class="ml-auto">
 				{#if expanded}
 					<ChevronDown class="size-4 text-muted-foreground" />
@@ -36,39 +37,39 @@
 			<div class="p-4 bg-card border-t border-muted">
 				<dl class="grid grid-cols-1 gap-3 text-sm">
 					<div>
-						<dt class="font-medium text-foreground">Model</dt>
+						<dt class="font-medium text-foreground">{m.observability_model()}</dt>
 						<dd class="text-muted-foreground font-mono text-xs mt-0.5">{metadata.model_used}</dd>
 					</div>
 					<div>
-						<dt class="font-medium text-foreground">Duration</dt>
+						<dt class="font-medium text-foreground">{m.observability_duration()}</dt>
 						<dd class="text-muted-foreground">{formatNumber(metadata.duration_ms)} ms</dd>
 					</div>
 					{#if metadata.token_metrics}
 						<div>
-							<dt class="font-medium text-foreground">Token Usage</dt>
+							<dt class="font-medium text-foreground">{m.observability_tokenUsage()}</dt>
 							<dd class="text-muted-foreground space-y-1 mt-0.5">
 								<div class="flex justify-between">
-									<span>Prompt:</span>
+									<span>{m.observability_tokenPrompt()}:</span>
 									<span class="font-mono text-xs"
 										>{formatNumber(metadata.token_metrics.prompt_tokens)}</span
 									>
 								</div>
 								<div class="flex justify-between">
-									<span>Completion:</span>
+									<span>{m.observability_tokenCompletion()}:</span>
 									<span class="font-mono text-xs"
 										>{formatNumber(metadata.token_metrics.completion_tokens)}</span
 									>
 								</div>
 								{#if metadata.token_metrics.thoughts_tokens}
 									<div class="flex justify-between">
-										<span>Thinking:</span>
+										<span>{m.observability_tokenThinking()}:</span>
 										<span class="font-mono text-xs"
 											>{formatNumber(metadata.token_metrics.thoughts_tokens)}</span
 										>
 									</div>
 								{/if}
 								<div class="flex justify-between font-medium border-t border-muted pt-1 mt-1">
-									<span>Total:</span>
+									<span>{m.observability_tokenTotal()}:</span>
 									<span class="font-mono text-xs"
 										>{formatNumber(metadata.token_metrics.total_tokens)}</span
 									>

frontend/src/lib/components/ReasoningChainViewer.svelte

@@ -1,5 +1,6 @@
 <script lang="ts">
 	import { Brain, ChevronDown, ChevronRight } from 'lucide-svelte';
+	import { m } from '$lib/paraglide/messages.js';
 
 	interface Props {
 		reasoningChain?: string;
@@ -18,7 +19,7 @@
 			class="w-full flex items-center gap-2 px-4 py-3 bg-muted/30 hover:bg-muted/50 transition-colors"
 		>
 			<Brain class="size-4 text-muted-foreground" />
-			<span class="text-sm font-medium text-foreground">AI Reasoning Process</span>
+			<span class="text-sm font-medium text-foreground">{m.observability_aiReasoningProcess()}</span>
 			<div class="ml-auto">
 				{#if expanded}
 					<ChevronDown class="size-4 text-muted-foreground" />

frontend/src/lib/components/StructuredErrorDisplay.svelte

@@ -1,5 +1,6 @@
 <script lang="ts">
 	import { XCircle } from 'lucide-svelte';
+	import { m } from '$lib/paraglide/messages.js';
 
 	interface Props {
 		error: string;
@@ -25,6 +26,20 @@
 	const cleanedErrors = $derived(
 		hasPrefix && prefix ? [errors[0].substring(prefix.length)] : errors
 	);
+
+	// Translate known error prefixes
+	const translatedPrefix = $derived(() => {
+		if (!prefix) return '';
+		const prefixText = prefix.replace(':', '').trim();
+		// Check for common validation failure prefix
+		if (
+			prefixText.includes('safety validation') ||
+			prefixText.includes('validation')
+		) {
+			return m.observability_validationFailed();
+		}
+		return prefixText;
+	});
 </script>
 
 <div class="editorial-alert editorial-alert--error">
@@ -32,7 +47,7 @@
 		<XCircle class="size-5 shrink-0 mt-0.5" />
 		<div class="flex-1">
 			{#if prefix}
-				<p class="font-medium mb-2">{prefix.replace(':', '')}</p>
+				<p class="font-medium mb-2">{translatedPrefix()}</p>
 			{/if}
 			{#if cleanedErrors.length === 1}
 				<p>{cleanedErrors[0]}</p>

frontend/src/lib/components/ValidationWarningsAlert.svelte

@@ -1,5 +1,6 @@
 <script lang="ts">
 	import { AlertTriangle } from 'lucide-svelte';
+	import { m } from '$lib/paraglide/messages.js';
 
 	interface Props {
 		warnings: string[];
@@ -19,7 +20,7 @@
 		<div class="flex items-start gap-2">
 			<AlertTriangle class="size-5 shrink-0 mt-0.5" />
 			<div class="flex-1">
-				<p class="font-medium mb-1">Validation Warnings</p>
+				<p class="font-medium mb-1">{m.observability_validationWarnings()}</p>
 				<ul class="list-disc list-inside space-y-1 text-sm">
 					{#each displayedWarnings as warning}
 						<li>{warning}</li>
@@ -31,7 +32,9 @@
 						onclick={() => (expanded = !expanded)}
 						class="text-sm underline mt-2 hover:no-underline"
 					>
-						{expanded ? 'Show less' : `Show ${warnings.length - 3} more`}
+						{expanded
+							? m.observability_showLess()
+							: m.observability_showMore({ count: warnings.length - 3 })}
 					</button>
 				{/if}
 			</div>