feat: async clip jobs, Siap-unduh state, cross-page ready toast

CHANGELOG.md

@@ -29,9 +29,17 @@ version tags are cut in this repo — POC stage, `main` is the release line).
   `None (Manual)` + require-plate controls; history/export plate, DO,
   expected, net columns.
 - `ERD.md` (Mermaid ERD, repo root; superseded `docs/do-erd.md`); tests `tests/test_do_batch.py`.
-- History `Klip` button → office-only `GET /api/batch-clip/<date>/<batch_number>`
-  trims+concatenates motionEye recordings to the batch window (`src/clip.py`),
-  download `b<n>-<date>-<HH-MM-SS>.mp4`.
+- History `Klip` button → office-only batch clip endpoints
+  (`POST /api/batch-clip/<date>/<batch_number>` + `/status`, `/file`,
+  `/pending`) trims+concatenates motionEye recordings to the batch window
+  (`src/clip.py`), download `b<n>-<date>-<HH-MM-SS>.mp4`.
+  - Async job processing: `Klip` → `Memproses…` (elapsed ticks, status polled
+    every 1.5 s) → `Siap — unduh` (manual trigger, file already rendered) →
+    `Unduh lagi` after the first download / `Gagal` (shows the job error).
+    State restored from `/pending` on load, so it survives navigation/reload.
+  - Non-blocking **`Klip siap`** / **`Klip gagal`** toast on all office pages
+    (`templates/base.html` polls `/pending` every 3 s, sessionStorage dedupe,
+    auto-dismiss 8 s, click → `/history`).
   - `MOTIONEYE_CLIP_PAD` (default ±3 s window padding) + OSD-clock alignment via
     single-frame OCR at each cut point (`MOTIONEYE_OSD_ALIGN`, default on).