Vitals log viewer

egui viewer for the vitals-log CSV files: status strip, grouped
time-series plots, incremental tailing of the monthly logs.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

README.md

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+# vitals
+
+Viewer for the CSV logs written by `vitals-log` (`~/.local/bin/vitals-log`, run
+every minute by the `vitals-log.timer` systemd user unit). Shows the latest
+reading and time-series plots of temperatures, battery, memory, memory pressure
+and load. Built with egui and egui_plot.
+
+    cargo install --path .
+    vitals [--dir PATH] [--interval SECONDS] [--range 1h|6h|24h|7d|all]
+
+The log directory defaults to `$XDG_STATE_HOME/vitals` (`~/.local/state/vitals`).
+Every `vitals-YYYY-MM.csv` there is loaded at startup; after that only bytes
+appended since the last check are read (every 10 s by default). Columns are
+matched by header name, so a changed log layout shows gaps rather than breaking.
+
+Drag to pan and ctrl-scroll or pinch to zoom the time axis; all plots move
+together. Picking a range preset returns to following the clock. Lines break
+where the logger was not running, and on-battery periods are shaded in the
+battery plot. Wide ranges are reduced to per-bucket min/max, so spikes stay
+visible.
+
+- `src/data.rs` — parsed series, windowing, gap splitting, downsampling
+- `src/tail.rs` — incremental file reader, month rollover, replaced-file reload
+- `src/main.rs` — the UI; the `PANELS` table defines the plots