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)

README_EN.md

@@ -326,6 +326,10 @@ A: The code doesn't depend on Windows-only APIs, but `tauri.conf.json` only targ
 - [Tauri](https://tauri.app) — the desktop app framework
 - Design specs in `docs/superpowers/specs/`, implementation plans in `docs/superpowers/plans/`
 
+## Credits
+
+The usage dashboard and session manager are ported from [kimicode-dashboard](https://github.com/JochenYang/kimicode-dashboard) (MIT License, © JochenYang). The original project implements local token usage analytics and session management for Kimi Code CLI. The Rust backend (`src-tauri/src/dashboard.rs`), dashboard UI (`src/components/dashboard/`), and sessions page (`src/components/sessions/`) in this project are derived from that work. Many thanks to the original author.
+
 ---
 
 License: MIT, see [LICENSE](./LICENSE). Copyright (c) 2026 CodingPlan.site