fix(analysis): gate partial LUFS, seed RAM paths, clarify logs, dedupe IPC (#320)

- Emit streaming partial loudness only when the loudness normalization engine is active
- Seed waveform/loudness from in-memory full buffers (preloaded, stream cache, gapless reuse) so offline hot cache does not rely on HTTP backfill
- Add explicit ranged/local/preload logs before full-file Symphonia + EBU analysis
- Coalesce concurrent waveform DB reads and skip duplicate audio_set_normalization within 450ms (e.g. StrictMode double init)

src-tauri/src/analysis_cache.rs

@@ -356,12 +356,16 @@ pub fn seed_from_bytes(
             return Ok(SeedFromBytesOutcome::SkippedWaveformCacheHit);
         }
     }
+    let mib = bytes.len() as f64 / (1024.0 * 1024.0);
     crate::app_deprintln!(
-        "[analysis][waveform] build start track_id={} bytes={} md5_16kb={}",
+        "[analysis] full-track analysis start track_id={} input_mib={:.2} md5_16kb={}",
         track_id,
-        bytes.len(),
+        mib,
         key.md5_16kb
     );
+    crate::app_deprintln!(
+        "[analysis] full-track analysis work: Symphonia decodes the entire buffer twice (frame timeline, then PCM peak bins), then EBU R128 integrated loudness + true-peak when that succeeds — CPU-bound; large lossless files often take minutes"
+    );
 
     let build = (|| -> Result<(bool, usize), String> {
         cache.touch_track_status(&key, "queued")?;
@@ -406,20 +410,21 @@ pub fn seed_from_bytes(
     match &build {
         Ok((used_pcm_decode, bins_len)) => {
             crate::app_deprintln!(
-                "[analysis][waveform] build done track_id={} elapsed_ms={} path={} bins_len={}",
+                "[analysis] full-track analysis done track_id={} elapsed_ms={} decode_path={} bins_len={} ebu_loudness_cached={}",
                 track_id,
                 elapsed_ms,
                 if *used_pcm_decode {
                     "pcm_ebur128"
                 } else {
-                    "byte_envelope"
+                    "byte_envelope_no_ebu"
                 },
-                bins_len
+                bins_len,
+                *used_pcm_decode
             );
         }
         Err(e) => {
             crate::app_deprintln!(
-                "[analysis][waveform] build failed track_id={} elapsed_ms={} err={}",
+                "[analysis] full-track analysis failed track_id={} elapsed_ms={} err={}",
                 track_id,
                 elapsed_ms,
                 e