refactor(viewer): drop kon_history localStorage; route edits through update_transcript

src/lib/stores/page.svelte.js

@@ -83,9 +83,9 @@ export function saveProfiles() {
 // array is seeded empty on module init and hydrated from SQLite on boot
 // in the desktop runtime. Browser preview (no Tauri) shows an empty list.
 //
-// The previous `kon_history` localStorage read-cache was removed to kill
+// The previous localStorage history read-cache was removed to kill the
-// the cold-start flicker where the UI painted stale localStorage data and
+// cold-start flicker where the UI painted stale cached data and then
-// then overwrote it from SQLite a tick later.
+// overwrote it from SQLite a tick later.
 
 import { invoke } from "@tauri-apps/api/core";
 import { hasTauriRuntime } from "$lib/utils/runtime.js";

src/routes/viewer/+page.svelte

@@ -200,8 +200,11 @@
 
   function toggleStar(idx) {
     if (item?.segments) {
+      // TODO: Phase 2 remaining Task 1.5 — starred is not a SQLite column
+      // on the transcripts table yet, so this mutation is in-memory only
+      // and will not survive a reload. Task 1.5 will extend update_transcript
+      // (and the transcripts schema) to carry starred segment state.
       item.segments[idx].starred = !item.segments[idx].starred;
-      saveItemToHistory();
     }
   }
 
@@ -214,21 +217,32 @@
     }
   }
 
+  // Persist edits back to SQLite via update_transcript (the canonical store).
+  // Only `text` and `title` are accepted by update_transcript today. Segment
+  // structure, segment-level starred flags, and manualTags are not SQLite
+  // columns yet — Phase 2 remaining Task 1.5 will extend the command and the
+  // transcripts schema to cover those. Until then, segment-level edits that
+  // change `item.text` (the joined full transcript) survive reload; the
+  // segment array itself does not.
+  //
+  // The cross-window `kon_viewer_item` localStorage payload stays in sync so
+  // a second viewer window hydrating from it reflects the latest edit.
   function saveItemToHistory() {
-    // Persist edits back to localStorage history
+    if (!item) return;
+    // Update the cross-window payload only. The old localStorage history
+    // cache was removed as part of the SQLite-canonical refactor.
     try {
-      const raw = localStorage.getItem("kon_history");
-      if (raw) {
-        const hist = JSON.parse(raw);
-        const idx = hist.findIndex((h) => h.id === item.id);
-        if (idx >= 0) {
-          hist[idx] = { ...hist[idx], segments: item.segments, text: item.text };
-          localStorage.setItem("kon_history", JSON.stringify(hist));
-        }
-      }
-      // Also update the viewer item cache
       localStorage.setItem("kon_viewer_item", JSON.stringify(item));
     } catch {}
+    // Best-effort SQLite persistence. Silently ignored in browser preview
+    // (no Tauri runtime) — matches the main-window store's behaviour.
+    invoke("update_transcript", {
+      id: String(item.id),
+      text: item.text ?? null,
+      title: item.title ?? null,
+    }).catch((err) => {
+      console.warn("viewer saveItemToHistory: update_transcript failed", err);
+    });
   }
 
   function scheduleTextSave() {