feat: add bird configuration preview functionality with tabbed interface for fragments and prefixes. Implement fragment extraction and default path selection for improved user experience in previewing BIRD configurations.

web/src/routes/operations/+page.svelte

@@ -60,6 +60,24 @@
 	let previewData = $state<unknown>(null);
 	let prefixesData = $state<string[]>([]);
 	let previewLoading = $state(false);
+	let previewSubTab = $state<'bird' | 'prefixes'>('bird');
+	let birdPreviewPath = $state('');
+
+	function asPreviewFragments(d: unknown): Record<string, string> {
+		if (!d || typeof d !== 'object' || Array.isArray(d)) return {};
+		const out: Record<string, string> = {};
+		for (const [k, v] of Object.entries(d as Record<string, unknown>)) {
+			if (typeof v === 'string') out[k] = v;
+		}
+		return out;
+	}
+
+	function defaultBirdPreviewPath(frags: Record<string, string>): string {
+		if (frags['_bird_full_expanded.conf']) return '_bird_full_expanded.conf';
+		if (frags['bird.conf']) return 'bird.conf';
+		const keys = Object.keys(frags).sort();
+		return keys[0] ?? '';
+	}
 
 	// Diff
 	let diffDialog = $state(false);
@@ -112,8 +130,10 @@
 		previewRevision = rev;
 		previewLoading = true;
 		previewDialog = true;
+		previewSubTab = 'bird';
 		previewData = null;
 		prefixesData = [];
+		birdPreviewPath = '';
 		try {
 			const [prev, pfx] = await Promise.all([
 				apiJSON<unknown>(`/v1/revisions/${rev.id}/preview`),
@@ -121,6 +141,8 @@
 			]);
 			previewData = prev;
 			prefixesData = (pfx.items ?? []).map((p: { prefix: string }) => p.prefix);
+			const frags = asPreviewFragments(prev);
+			birdPreviewPath = defaultBirdPreviewPath(frags);
 		} catch (e) {
 			toast.error(e instanceof Error ? e.message : String(e));
 		} finally {
@@ -483,22 +505,58 @@
 
 <!-- Preview dialog -->
 <Dialog bind:open={previewDialog}>
-	<DialogContent class="sm:max-w-2xl">
+	<DialogContent class="sm:max-w-4xl">
 		<DialogHeader>
 			<DialogTitle>Ревизия {previewRevision?.id.slice(0, 8)}…</DialogTitle>
-			<DialogDescription>Предпросмотр префиксов ревизии</DialogDescription>
+			<DialogDescription>
+				Срендеренный конфиг BIRD 2 (фрагменты из control plane) и материализованные префиксы.
+			</DialogDescription>
 		</DialogHeader>
 		{#if previewLoading}
 			<p class="text-muted-foreground py-4 text-center text-sm">Загрузка…</p>
 		{:else}
-			<p class="text-sm mb-2"><span class="font-medium">Префиксов:</span> {prefixesData.length}</p>
-			<ScrollArea class="max-h-80 rounded border p-3">
-				{#each prefixesData as pfx}
-					<p class="font-mono text-xs">{pfx}</p>
-				{:else}
-					<p class="text-muted-foreground text-xs">Нет префиксов</p>
-				{/each}
-			</ScrollArea>
+			<Tabs bind:value={previewSubTab} class="w-full">
+				<TabsList class="grid w-full max-w-md grid-cols-2">
+					<TabsTrigger value="bird">Конфиг BIRD</TabsTrigger>
+					<TabsTrigger value="prefixes">Префиксы</TabsTrigger>
+				</TabsList>
+				<TabsContent value="bird" class="mt-3 space-y-2">
+					{@const frags = asPreviewFragments(previewData)}
+					{#if Object.keys(frags).length === 0}
+						<p class="text-muted-foreground text-sm">Нет фрагментов превью (старая ревизия или пустой render).</p>
+					{:else}
+						<div class="flex flex-wrap items-center gap-2">
+							<label for="bird-frag" class="text-muted-foreground text-sm">Файл</label>
+							<select
+								id="bird-frag"
+								class="border-input bg-background ring-offset-background focus-visible:ring-ring max-w-xl flex-1 rounded-md border px-2 py-1.5 text-sm focus-visible:ring-2 focus-visible:outline-none"
+								bind:value={birdPreviewPath}
+							>
+								{#each Object.keys(frags).sort() as path}
+									<option value={path}>{path}</option>
+								{/each}
+							</select>
+						</div>
+						<p class="text-muted-foreground text-xs">
+							Совет: откройте <code class="bg-muted rounded px-1">_bird_full_expanded.conf</code> — один текст с
+							<code class="bg-muted rounded px-1">bird.conf</code> и содержимым всех include.
+						</p>
+						<ScrollArea class="max-h-[min(70vh,28rem)] rounded border">
+							<pre class="p-3 font-mono text-xs whitespace-pre-wrap break-words">{frags[birdPreviewPath] ?? ''}</pre>
+						</ScrollArea>
+					{/if}
+				</TabsContent>
+				<TabsContent value="prefixes" class="mt-3">
+					<p class="text-sm mb-2"><span class="font-medium">Префиксов:</span> {prefixesData.length}</p>
+					<ScrollArea class="max-h-80 rounded border p-3">
+						{#each prefixesData as pfx}
+							<p class="font-mono text-xs">{pfx}</p>
+						{:else}
+							<p class="text-muted-foreground text-xs">Нет префиксов</p>
+						{/each}
+					</ScrollArea>
+				</TabsContent>
+			</Tabs>
 		{/if}
 	</DialogContent>
 </Dialog>