Movie Editor: preserve scroll, stop per-second autosave (save on blur instead)

- Inspector preserves scrollTop across rebuilds, so editing no longer jumps the panel
  to the top.
- Autosave only persists to disk; it doesn't need to fire every keystroke. Free-text/
  number fields now debounce 6s and are FLUSHED on blur (flushSave); discrete actions
  save ~1.2s after the last change. generate()/generateMontage() flush first so the
  server has the latest edits before reading the project.

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

movie_editor/frontend/inspector.js

@@ -462,6 +462,7 @@
   function render(st) {
     if (_editing) return;  // editing in progress — leave the DOM (and the user's caret) alone
 
+    const scrollTop = body.scrollTop;  // preserve scroll across the rebuild
     clear(body);
     if (!st.project) { title.textContent = "Inspector"; body.append(el("div", "pj-meta", "No project open.")); return; }
     const scene = st.selectedSceneId ? S.scene(st.selectedSceneId) : null;
@@ -470,6 +471,7 @@
     if (scene) renderScene(st, scene); else renderProject(st);
     renderExposed(st);
     renderSplit(st);
+    body.scrollTop = scrollTop;  // restore so editing doesn't jump to the top
   }
 
   // Track edit state so autosave re-renders never interrupt the focused field.
@@ -481,8 +483,13 @@
     const t = e.target;
     if (!(t && t.dataset && t.dataset.k)) return;
     _editing = false;
-    // If focus didn't move to another of our fields, re-sync the inspector to state.
-    setTimeout(() => { if (!_editing) render(S.get()); }, 60);
+    // Persist the edit now (no more per-second autosave), then re-sync if focus didn't
+    // move to another field. flushSave commits + notifies (which renders); fall back to a
+    // manual render when there was nothing pending.
+    setTimeout(() => {
+      if (_editing) return;
+      if (!S.flushSave()) render(S.get());
+    }, 60);
   });
 
   S.subscribe(render);

movie_editor/frontend/store.js

@@ -106,15 +106,29 @@
   }
 
   // ── editing ────────────────────────────────────────────────────────────────
+  // Autosave just persists the project to disk so edits aren't lost — it does NOT need
+  // to fire every keystroke. Discrete actions (dropdowns, checkboxes) save ~1s after the
+  // last change; free typing waits longer and is flushed on blur (see flushSave).
   function scheduleSave() {
     state.saving = true; notify();
     clearTimeout(saveTimer);
-    saveTimer = setTimeout(commit, 900);
+    saveTimer = setTimeout(() => { saveTimer = null; commit(); }, 1200);
   }
 
   // For free-text / number fields: update state and queue a save WITHOUT re-rendering,
-  // so typing isn't interrupted. The eventual commit() re-renders once, after a pause.
-  function scheduleSaveSilent() { clearTimeout(saveTimer); saveTimer = setTimeout(commit, 1100); }
+  // so typing isn't interrupted. Long debounce; blur flushes it (flushSave).
+  function scheduleSaveSilent() {
+    clearTimeout(saveTimer);
+    saveTimer = setTimeout(() => { saveTimer = null; commit(); }, 6000);
+  }
+
+  // Commit any pending save immediately (field blur / before generate). Returns the
+  // commit promise when it flushed, else null.
+  function flushSave() {
+    if (!saveTimer) return null;
+    clearTimeout(saveTimer); saveTimer = null;
+    return commit();
+  }
 
   async function commit() {
     if (!state.project) return;
@@ -395,6 +409,7 @@
 
   async function generate(onlyScene) {
     if (!state.project) return;
+    await flushSave();  // ensure the server has the latest edits before generating
     if (!onlyScene) return generateMontage();
     await _generateRun([onlyScene], onlyScene, "Generating scene");
   }
@@ -403,6 +418,7 @@
   // (one GPU at a time). Each run's first scene supplies its i2v anchor.
   async function generateMontage() {
     if (!state.project) return;
+    await flushSave();  // persist pending edits before reading scenes/runs
     const runs = _runs();
     if (!runs.length) { set({ gen: { state: "error", promptId: null, media: [], msg: "No active scenes to generate." } }); return; }
     for (let i = 0; i < runs.length; i++) {
@@ -568,7 +584,7 @@
   window.Store = {
     get, set, subscribe, init,
     refreshProjectList, loadProject, newProject, deleteProject, downloadProject, importProject,
-    patchProject, patchProjectQuiet, patchScene, patchSceneQuiet, selectScene, addScene, removeScene, moveScene, scene,
+    patchProject, patchProjectQuiet, patchScene, patchSceneQuiet, flushSave, selectScene, addScene, removeScene, moveScene, scene,
     resizeScene, splitScene, snapFrames,
     refreshPreview, syncFromPreview, applyGlobalPrompt, generate, generateMontage, renderFinal, exportSelected, loadModels, loadImageTargets, setModelInput, setModelLink,
     setConditioningSlot, setSamplerSlot, setSamplerInput, setSamplerInputNow, setStudioInput, setStudioInputNow,