fix(MULTIVERSION-0001): fix version indexing pipeline state and UI reactivity

- Add updateVersion() helper to IndexingPipeline that writes to repository_versions
- Set version state to indexing/indexed/error at the appropriate pipeline stages
- Add computeVersionStats() to count snippets for a specific version
- Replace Map<string,string> with Record<string,string|undefined> for activeVersionJobs to fix Svelte 5 reactivity edge cases
- Remove premature loadVersions() call from handleIndexVersion (oncomplete fires it instead)
- Add refreshRepo() to version oncomplete callback so stat badges update after indexing
- Disable Index button when activeVersionJobs has an entry for that tag (not just version.state)
- Add three pipeline test cases covering versionId indexing, error, and no-touch paths

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/server/pipeline/indexing.pipeline.ts

@@ -90,6 +90,9 @@ export class IndexingPipeline {
 
 			// Mark repo as actively indexing.
 			this.updateRepo(repo.id, { state: 'indexing' });
+			if (normJob.versionId) {
+				this.updateVersion(normJob.versionId, { state: 'indexing' });
+			}
 
 			// ---- Stage 1: Crawl -------------------------------------------------
 			const crawlResult = await this.crawl(repo);
@@ -229,6 +232,15 @@ export class IndexingPipeline {
 				lastIndexedAt: Math.floor(Date.now() / 1000)
 			});
 
+			if (normJob.versionId) {
+				const versionStats = this.computeVersionStats(normJob.versionId);
+				this.updateVersion(normJob.versionId, {
+					state: 'indexed',
+					totalSnippets: versionStats.totalSnippets,
+					indexedAt: Math.floor(Date.now() / 1000)
+				});
+			}
+
 			this.updateJob(job.id, {
 				status: 'done',
 				progress: 100,
@@ -246,6 +258,9 @@ export class IndexingPipeline {
 
 			// Restore repo to error state but preserve any existing indexed data.
 			this.updateRepo(repositoryId, { state: 'error' });
+			if (normJob.versionId) {
+				this.updateVersion(normJob.versionId, { state: 'error' });
+			}
 
 			throw error;
 		}
@@ -384,6 +399,16 @@ export class IndexingPipeline {
 		};
 	}
 
+	private computeVersionStats(versionId: string): { totalSnippets: number } {
+		const row = this.db
+			.prepare<[string], { total_snippets: number }>(
+				`SELECT COUNT(*) as total_snippets FROM snippets WHERE version_id = ?`
+			)
+			.get(versionId);
+
+		return { totalSnippets: row?.total_snippets ?? 0 };
+	}
+
 	// -------------------------------------------------------------------------
 	// Private — DB helpers
 	// -------------------------------------------------------------------------
@@ -433,6 +458,14 @@ export class IndexingPipeline {
 		const values = [...Object.values(allFields), id];
 		this.db.prepare(`UPDATE repositories SET ${sets} WHERE id = ?`).run(...values);
 	}
+
+	private updateVersion(id: string, fields: Record<string, unknown>): void {
+		const sets = Object.keys(fields)
+			.map((k) => `${toSnake(k)} = ?`)
+			.join(', ');
+		const values = [...Object.values(fields), id];
+		this.db.prepare(`UPDATE repository_versions SET ${sets} WHERE id = ?`).run(...values);
+	}
 }
 
 // ---------------------------------------------------------------------------