docs: describe update checks, token-refresh runs and full menu

The README now says the app checks GitHub Releases at first launch and hourly by default, which CLI runs it starts to refresh an expired token, the claude CLI requirement for that refresh, and the Show widget, Restart and Reset position items, plus the stored widget visibility and update check interval.

README.md

@@ -37,7 +37,7 @@ self-updater are all written from scratch against the same public APIs
 - Left-click the bubble for an expanded panel with both **5h** and **7d**
   bars plus reset countdowns
 - Right-click for refresh, displayed providers, update frequency, startup,
-  updates, exit
+  **Reset position**, updates, **Show widget**, **Restart** and **Exit**
 - A system tray icon per enabled provider, with a usage badge
 - Desktop notifications when usage crosses a threshold, when a sign-in
   expires and after an update was applied
@@ -55,7 +55,11 @@ right-click **Providers** menu.
 
 - Windows 10 or Windows 11, or Linux x86_64 (see below)
 - Claude Code (CLI or App) installed and authenticated
-- Optional: Codex CLI installed and authenticated, if you want Codex usage
+- The `claude` CLI, for automatic token refresh. The app looks for it on
+  `PATH`, and on Linux also in `~/.local/bin` and `~/.claude/local`. Without
+  it an expired sign-in is not refreshed and you have to sign in again.
+- Optional: Codex CLI installed and authenticated, if you want Codex usage.
+  Its token is refreshed through the `codex` CLI, found the same way.
 
 ### Windows
 
@@ -158,9 +162,11 @@ primary monitor on first launch. Drag it where you want it, release to snap
 to the nearest edge if you let go close to one.
 
 - **Left-click** the bubble to open the expanded panel (5h + 7d + countdowns)
-- **Right-click** for refresh, providers, refresh frequency, "Start with
-  Windows" ("Start at login" on Linux), controls, auto-update check
-  (Disabled / Hourly / Daily / Weekly), manual "Check for updates", exit
+- **Right-click** for **Refresh**, **Update frequency**, **Providers**,
+  **Settings**, **Controls**, **Show widget**, **Restart** and **Exit**.
+  **Settings** holds "Start with Windows" ("Start at login" on Linux),
+  **Reset position**, a manual **Check for updates** and the
+  **Auto-update check** interval (Disabled / Hourly / Daily / Weekly)
 - **Drag** anywhere — it floats on top of all other windows
 - **Ctrl + MouseWheel** on the bubble, or **Controls** in the right-click
   menu, to resize it
@@ -241,13 +247,28 @@ What the app sends over the network:
 
 - Requests to Anthropic's Claude endpoints to read your usage
 - Requests to ChatGPT's Codex usage endpoint, if Codex is enabled
-- Requests to GitHub only if you use the app's update-check feature
+- Requests for `latest.json` from GitHub Releases, at first launch and then
+  hourly by default. Set **Settings** → **Auto-update check** to
+  **Disabled** in the right-click menu to stop them; **Check for updates**
+  still works when you click it.
+
+What the app runs:
+
+- When a usage request is rejected because the sign-in has expired, the app
+  runs `claude -p .` for Claude Code and `codex exec .` for Codex, for each
+  provider that was rejected. They run hidden in the background, so the CLI
+  refreshes its token. Each run sends one tiny prompt, which counts toward
+  your usage. The runs use the system temporary directory as their working
+  directory, and Codex runs with `--skip-git-repo-check` and a read-only
+  sandbox.
 
 What the app stores locally:
 
 - Bubble position(s) per model
 - Bubble size
+- Whether the bubbles are shown (**Show widget**)
 - Polling frequency
+- Auto-update check interval
 - Last update check time
 - Displayed provider preferences