fix(live): expose full refresh busy and phase progress

Ensure full refresh marks the live projection as building before source refresh awaits, and expose phase-specific counters so language detection progress is determinate.

Covers #40 and #41.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

test/t40FullRefreshImmediateStateRegression.test.js

@@ -0,0 +1,71 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const Database = require('better-sqlite3');
+const liveProjection = require('../server/services/liveProjectionService');
+const { LIVE_PROJECTION_SCHEMA_SQL } = require('../server/db/liveProjectionSchema');
+
+function createDb() {
+    const db = new Database(':memory:');
+    db.exec(`
+        CREATE TABLE playlist_items (
+            id TEXT PRIMARY KEY,
+            source_id INTEGER NOT NULL,
+            item_id TEXT NOT NULL,
+            type TEXT NOT NULL,
+            name TEXT NOT NULL,
+            category_id TEXT,
+            parent_id TEXT,
+            stream_icon TEXT,
+            stream_url TEXT,
+            container_extension TEXT,
+            rating REAL,
+            year TEXT,
+            added_at TEXT,
+            is_hidden INTEGER DEFAULT 0,
+            is_favorite INTEGER DEFAULT 0,
+            data JSON,
+            logical_channel_id TEXT,
+            grouping_fingerprint TEXT,
+            grouping_input_hash TEXT,
+            quality_label TEXT,
+            quality_rank INTEGER,
+            variant_rank INTEGER,
+            language_code TEXT,
+            language_confidence REAL,
+            language_scores JSON,
+            language_evidence JSON,
+            language_detector TEXT,
+            language_input_hash TEXT
+        );
+    `);
+    db.exec(LIVE_PROJECTION_SCHEMA_SQL);
+    return db;
+}
+
+test('full refresh marks projection busy before awaiting source refresh work', () => {
+    const db = createDb();
+    db.prepare(`
+        INSERT INTO catalog_projection_state
+            (projection, status, started_at, completed_at, input_hash, projected_count,
+             phase, processed_count, total_count, laya_processed_count, laya_total_count, error)
+        VALUES ('live', 'success', 100, 200, 'old-hash', 12, 'complete', 12, 12, 0, 0, NULL)
+    `).run();
+
+    let liveRefreshStarted = false;
+    liveProjection.fullRebuildOrchestrator(db, {
+        syncService: {
+            refreshEnabledLiveSources: () => {
+                liveRefreshStarted = true;
+                return new Promise(() => {});
+            },
+            refreshEnabledEpgSources: async () => {}
+        },
+        sources: { getByType: async () => [] }
+    });
+
+    const state = liveProjection.projectionState(db);
+    assert.equal(liveRefreshStarted, true);
+    assert.equal(state.status, 'building');
+    assert.equal(state.phase, 'refreshing_live_sources');
+    assert.equal(state.completed_at, null);
+});