feat: v0.3.0 re-release - add dashboard & sessions, hide pi option

- Usage dashboard: KPIs, model split, daily bars, year heatmap, recent requests
- Sessions management: list/preview/archive/delete with streaming preview
- Double-click daily bar opens per-model breakdown modal
- Paginated recent requests (30/page)
- Hide pi option from nav (kept code, just removed from UI)
- Timezone fixes: today/day_key/heatmap now use local calendar day
- Streaming preview with 20MB byte cap + 500-char frontend clip
- README attribution to kimicode-dashboard (MIT, JochenYang)

src/types/dashboard.ts

@@ -0,0 +1,108 @@
+// Dashboard types — match the Rust structs in src-tauri/src/dashboard.rs (camelCase serde)
+
+export interface TotalsRow {
+  requests: number;
+  inputOther: number;
+  output: number;
+  inputCacheRead: number;
+  inputCacheCreation: number;
+  costUsd: number;
+  totalTokens: number;
+  cacheHitRate: number;
+}
+
+export interface DailyRow extends TotalsRow {
+  date: string;
+  byModel: Record<string, number>;
+}
+
+export interface ModelRow extends TotalsRow {
+  model: string;
+  modelDisplay: string;
+  modelResolved: string;
+  priceId: string;
+  costEstimated: boolean;
+}
+
+export interface RecentRow {
+  time: number;
+  model: string;
+  modelDisplay: string;
+  modelResolved: string;
+  inputOther: number;
+  output: number;
+  inputCacheRead: number;
+  inputCacheCreation: number;
+  totalTokens: number;
+  costUsd: number;
+  costEstimated: boolean;
+  priceId: string;
+  fromEnv: boolean;
+}
+
+export interface RangeStats {
+  range: string;
+  totals: TotalsRow;
+  daily: DailyRow[];
+  models: ModelRow[];
+  recent: RecentRow[];
+  recentTotal: number;
+  recentLimit: number;
+}
+
+export interface HeatmapCell {
+  date: string;
+  dow: number;
+  weekIndex: number;
+  requests: number;
+  totalTokens: number;
+  costUsd: number;
+  cacheHitRate: number;
+  level: number;
+}
+
+export interface MonthLabel {
+  weekIndex: number;
+  label: string;
+}
+
+export interface HeatmapData {
+  weeks: number;
+  start: string;
+  end: string;
+  maxTokens: number;
+  cells: HeatmapCell[];
+  monthLabels: MonthLabel[];
+}
+
+export interface ScanMeta {
+  filesScanned: number;
+  linesSeen: number;
+  recordCount: number;
+  home: string;
+  sessionsRoot: string;
+  errors: string[];
+}
+
+export interface AllModelRow {
+  model: string;
+  modelDisplay: string;
+  requests: number;
+  totalTokens: number;
+  costUsd: number;
+  costEstimated: boolean;
+  cacheHitRate: number;
+}
+
+export interface SummaryResult {
+  home: string;
+  valid: boolean;
+  scannedAt: number;
+  meta: ScanMeta;
+  range: string;
+  stats: RangeStats;
+  heatmap: HeatmapData;
+  allModels: AllModelRow[];
+  allModelCount: number;
+  rangeTotals: Record<string, TotalsRow>;
+}

src/types/sessions.ts

@@ -0,0 +1,61 @@
+// Session management types — match Rust structs in dashboard.rs (camelCase serde)
+
+export interface WorkspaceRow {
+  id: string;
+  name: string;
+  root: string | null;
+  createdAt: string | null;
+  lastOpenedAt: string | null;
+  activeCount: number;
+  archivedCount: number;
+  empty: boolean;
+}
+
+export interface SessionRow {
+  id: string;
+  workspaceId: string;
+  status: "active" | "archived" | string;
+  title: string | null;
+  workDir: string | null;
+  createdAt: string | null;
+  updatedAt: string | null;
+  bytes: number;
+  files: number;
+}
+
+export interface SessionsResult {
+  home: string;
+  archiveRoot: string;
+  workspaces: WorkspaceRow[];
+  sessions: SessionRow[];
+}
+
+export interface ActionResponse {
+  ok: boolean;
+  workspaceId: string;
+  sessionId: string;
+  status?: string | null;
+  path?: string | null;
+  deleted?: boolean | null;
+}
+
+export interface PreviewMessage {
+  role: string;
+  time: number | null;
+  text: string;
+}
+
+export interface PreviewResult {
+  workspaceId: string;
+  sessionId: string;
+  status: string;
+  title: string | null;
+  workDir: string | null;
+  createdAt: string | null;
+  updatedAt: string | null;
+  messageCount: number;
+  truncated: boolean;
+  messages: PreviewMessage[];
+}
+
+export type SessionStatusFilter = "active" | "archived" | "all";