Remove standalone fetcher, add setup tool with install/uninstall workflow

Drop claude-fetcher binary and cron job — the widget's built-in
BackgroundFetcher is the sole fetcher now. Add cmd/setup with cross-platform
install and uninstall (--uninstall): kills widget, removes binaries + autostart,
cleans Claude Code statusline setting, optionally removes config dir.

Also includes: browser-based login (chromedp), ICO wrapper for Windows tray
icon, and reduced icon size (64px).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -17,7 +17,7 @@
 
 ## Overview
 
-Three static binaries built from one Go codebase. No runtime dependencies — no Node.js, Python, or system packages needed.
+Two static binaries built from one Go codebase. No runtime dependencies — no Node.js, Python, or system packages needed. A `setup` tool handles installation and uninstallation on both platforms.
 
 ### CLI Statusline
 
@@ -27,47 +27,49 @@ Headless status bar for Claude Code. Shows context window utilization and token
 Context ▓▓▓▓░░░░░░ 40% | Token ▓▓░░░░░░░░ 19% 78M
 ```
 
-### Usage Fetcher
-
-Standalone binary for cron. Fetches token usage from the Claude API and writes a shared JSON cache.
-
 ### Desktop Widget
 
-System tray icon showing 5-hour usage as a circular progress bar on a Claude starburst logo. Color shifts from green through amber to red as usage increases. Right-click menu shows detailed stats and configuration.
+System tray icon showing 5-hour usage as a circular progress bar on a Claude starburst logo. Color shifts from green through amber to red as usage increases. Has a built-in background fetcher that writes a shared JSON cache. Right-click menu shows detailed stats and configuration.
 
 ## Topology
 
 ```
 claude.ai API
      │
-     ├──► claude-fetcher (cron)  ──► /tmp/claude_usage.json ──► claude-statusline (Claude Code)
-     │                                       │
-     └──► claude-widget (built-in fetcher) ──┘──► System tray icon
+     └──► claude-widget (background fetcher) ──► /tmp/claude_usage.json ──► claude-statusline (Claude Code)
+                                                         │
+                                                         └──► System tray icon
 ```
 
-Only one fetcher needs to run. The widget has a built-in fetcher; the standalone `claude-fetcher` is for headless/cron setups. Both write the same cache format.
-
 ## Installation
 
+### Windows / Linux (setup tool)
+
+Extract the archive and run the setup tool. It copies binaries to the install directory, enables autostart for the widget, and configures Claude Code's statusline setting.
+
+```bash
+# Windows — double-click setup.exe, or from a terminal:
+setup.exe
+
+# Linux
+./setup
+```
+
 ### Debian/Ubuntu (.deb)
 
 ```bash
 sudo dpkg -i claude-statusline_0.3.0_amd64.deb
 ```
 
-Installs all three binaries to `/usr/bin/`, sets up autostart for the widget, and adds a cron job for the fetcher.
+Installs binaries to `/usr/bin/` and sets up autostart for the widget.
 
-### Linux (tar.gz)
+### Linux (manual)
 
 ```bash
 tar xzf claude-statusline_0.3.0_linux_amd64.tar.gz
-sudo cp claude-statusline-0.3.0/claude-{statusline,fetcher,widget} /usr/local/bin/
+cp claude-statusline-0.3.0/claude-{statusline,widget} ~/.local/bin/
 ```
 
-### Windows
-
-Extract the `.zip` and place the `.exe` files anywhere on your PATH.
-
 ### Session Key Setup
 
 After installing, paste your claude.ai session key:
@@ -98,6 +100,26 @@ Add to your Claude Code settings (`~/.claude/settings.json`):
 }
 ```
 
+## Uninstall
+
+### Windows / Linux (setup tool)
+
+```bash
+# Windows
+setup.exe --uninstall
+
+# Linux
+./setup --uninstall
+```
+
+Stops the widget, removes binaries and autostart entry, and cleans the `statusLine` setting from Claude Code. Optionally removes the config directory (interactive prompt, default: keep).
+
+### Debian/Ubuntu
+
+```bash
+sudo dpkg -r claude-statusline
+```
+
 ## Configuration
 
 ### Environment Variables
@@ -136,12 +158,12 @@ Right-click the tray icon to access:
 
 ```bash
 # All binaries
-go build ./cmd/statusline && go build ./cmd/fetcher && go build ./cmd/widget
+go build ./cmd/statusline && go build ./cmd/widget && go build ./cmd/setup
 
 # Cross-compile for Windows
 GOOS=windows GOARCH=amd64 go build -ldflags "-H=windowsgui" -o claude-widget.exe ./cmd/widget
 GOOS=windows GOARCH=amd64 go build -o claude-statusline.exe ./cmd/statusline
-GOOS=windows GOARCH=amd64 go build -o claude-fetcher.exe ./cmd/fetcher
+GOOS=windows GOARCH=amd64 go build -o setup.exe ./cmd/setup
 
 # Build .deb
 VERSION=0.3.0 nfpm package --config packaging/nfpm.yaml --packager deb
@@ -152,17 +174,17 @@ VERSION=0.3.0 nfpm package --config packaging/nfpm.yaml --packager deb
 ```
 cmd/
   statusline/main.go     # CLI statusline (reads stdin + cache)
-  fetcher/main.go        # Standalone cron fetcher (writes cache)
-  widget/main.go         # Desktop tray widget entry point
+  widget/main.go         # Desktop tray widget with built-in fetcher
+  setup/main.go          # Cross-platform install/uninstall tool
 internal/
   config/config.go       # Shared config (session key, org ID, intervals)
-  fetcher/fetcher.go     # HTTP fetch logic (shared between widget + standalone)
+  fetcher/fetcher.go     # HTTP fetch logic (used by widget)
   fetcher/cache.go       # JSON cache read/write (/tmp/claude_usage.json)
   renderer/renderer.go   # Icon rendering: starburst + arc (fogleman/gg)
   tray/tray.go           # System tray setup + menu (fyne-io/systray)
 packaging/
   nfpm.yaml              # .deb packaging config
-  linux/                 # .desktop file, cron, install scripts
+  linux/                 # .desktop file, install scripts
 ```
 
 ## License