Add Tauri config, Cargo.toml, capabilities

src-tauri/Cargo.toml

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+[package]
+name = "claude-usage-widget"
+version = "0.1.0"
+description = "Always-on-top Windows widget visualizing local Claude Code usage"
+authors = ["megaproxy"]
+edition = "2021"
+rust-version = "1.77"
+
+[lib]
+name = "claude_usage_widget_lib"
+crate-type = ["staticlib", "cdylib", "rlib"]
+
+[build-dependencies]
+tauri-build = { version = "2", features = [] }
+
+[dependencies]
+tauri = { version = "2", features = [] }
+tauri-plugin-autostart = "2"
+tauri-plugin-store = "2"
+tauri-plugin-dialog = "2"
+
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+chrono = { version = "0.4", features = ["serde"] }
+
+notify = "6"
+notify-debouncer-full = "0.3"
+walkdir = "2"
+
+anyhow = "1"
+thiserror = "1"
+tokio = { version = "1", features = ["full"] }
+dirs = "5"
+once_cell = "1"
+parking_lot = "0.12"
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+
+[target.'cfg(windows)'.dependencies]
+windows = { version = "0.58", features = ["Win32_System_Console"] }
+
+[features]
+# Default: production binary (no console window on Windows)
+default = ["custom-protocol"]
+custom-protocol = ["tauri/custom-protocol"]
+
+[profile.release]
+panic = "abort"
+codegen-units = 1
+lto = true
+opt-level = "s"
+strip = true

src-tauri/build.rs

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+fn main() {
+    tauri_build::build()
+}

src-tauri/capabilities/default.json

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+{
+  "$schema": "../gen/schemas/desktop-schema.json",
+  "identifier": "default",
+  "description": "Capabilities granted to the main window. FS reads happen Rust-side, so no fs:* permissions are needed.",
+  "windows": ["main"],
+  "permissions": [
+    "core:default",
+    "core:event:allow-listen",
+    "core:event:allow-unlisten",
+    "core:event:allow-emit",
+    "core:event:allow-emit-to",
+    "core:window:allow-start-dragging",
+    "core:window:allow-set-position",
+    "core:window:allow-close",
+    "core:window:allow-hide",
+    "core:window:allow-show",
+    "core:app:allow-version",
+    "autostart:default",
+    "store:default",
+    "dialog:default"
+  ]
+}

src-tauri/icons/README.md

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+# Icons
+
+Placeholder. Before `pnpm tauri build` will succeed you need real icons here.
+
+Quickest path: `pnpm tauri icon path/to/source-1024x1024.png` — Tauri generates every required size + format (`.ico`, `.icns`, `.png`).
+
+Files Tauri's bundler expects (referenced from `tauri.conf.json`):
+
+- `32x32.png`
+- `128x128.png`
+- `128x128@2x.png`
+- `icon.icns`
+- `icon.ico`

src-tauri/tauri.conf.json

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+{
+  "$schema": "https://schema.tauri.app/config/2",
+  "productName": "Claude Usage Widget",
+  "version": "0.1.0",
+  "identifier": "com.megaproxy.claude-usage-widget",
+  "build": {
+    "beforeDevCommand": "pnpm dev",
+    "beforeBuildCommand": "pnpm build",
+    "devUrl": "http://localhost:1420",
+    "frontendDist": "../dist"
+  },
+  "app": {
+    "windows": [
+      {
+        "label": "main",
+        "title": "Claude Usage",
+        "width": 280,
+        "height": 360,
+        "minWidth": 280,
+        "minHeight": 360,
+        "resizable": false,
+        "decorations": false,
+        "transparent": true,
+        "alwaysOnTop": true,
+        "skipTaskbar": true,
+        "shadow": false,
+        "center": false,
+        "x": 40,
+        "y": 40,
+        "visible": true
+      }
+    ],
+    "security": {
+      "csp": "default-src 'self'; img-src 'self' data:; style-src 'self' 'unsafe-inline'; script-src 'self'"
+    }
+  },
+  "plugins": {
+    "autostart": {
+      "args": ["--minimized"]
+    }
+  },
+  "bundle": {
+    "active": true,
+    "targets": ["nsis"],
+    "icon": [
+      "icons/32x32.png",
+      "icons/128x128.png",
+      "icons/128x128@2x.png",
+      "icons/icon.icns",
+      "icons/icon.ico"
+    ],
+    "category": "Utility",
+    "shortDescription": "At-a-glance Claude Code usage on the Windows desktop",
+    "longDescription": "Floating, always-on-top widget that visualizes your current 5-hour Claude Code session block, the past 7 days of usage, and a per-model breakdown. Reads JSONL transcripts directly from the Claude Code config directory — no Anthropic API, no auth."
+  }
+}