feat(import): imports store tracking per-meeting import phase progress

src/lib/stores/imports.svelte.ts

@@ -0,0 +1,63 @@
+// Live per-meeting progress of background media imports (feeds ImportTracker).
+// Fed entirely by `import://progress` events emitted by `import_media`; kept in
+// memory only (the meeting's `status` badge is the persistent story after a
+// restart). See commands.rs `run_import_pipeline`.
+
+import { events, type ImportPhase, type ImportProgress, type MeetingId } from "../api";
+
+export type PhaseState = "pending" | "active" | "done" | "error";
+
+// The four phases in the order the backend runs (and the tracker renders) them.
+export const IMPORT_PHASES: ImportPhase[] = ["prepare", "transcribe", "diarize", "finalize"];
+
+export interface PhaseInfo {
+  phase: ImportPhase;
+  state: PhaseState;
+  elapsedMs: number | null;
+}
+
+export interface ImportRun {
+  meetingId: MeetingId;
+  phases: PhaseInfo[];
+  error: string | null;
+  done: boolean;
+}
+
+function freshRun(meetingId: MeetingId): ImportRun {
+  return {
+    meetingId,
+    phases: IMPORT_PHASES.map((phase) => ({ phase, state: "pending", elapsedMs: null })),
+    error: null,
+    done: false,
+  };
+}
+
+class ImportsStore {
+  runs = $state<Record<MeetingId, ImportRun>>({});
+
+  get(meetingId: MeetingId): ImportRun | undefined {
+    return this.runs[meetingId];
+  }
+
+  async init() {
+    await events.onImportProgress((p) => this.apply(p));
+  }
+
+  private apply(p: ImportProgress) {
+    // Re-read through the record after inserting so we mutate the $state proxy,
+    // not the raw object (Svelte 5 deep reactivity only tracks the proxy).
+    if (!this.runs[p.meetingId]) this.runs[p.meetingId] = freshRun(p.meetingId);
+    const run = this.runs[p.meetingId];
+    const info = run.phases.find((x) => x.phase === p.phase);
+    if (!info) return;
+    info.state = p.state;
+    if (p.state === "done") info.elapsedMs = p.elapsedMs;
+    if (p.state === "error") {
+      run.error = p.error;
+      run.done = true;
+    }
+    if (p.phase === "finalize" && p.state === "done") run.done = true;
+  }
+}
+
+export const imports = new ImportsStore();