Update README: fix stale claims found in code review

- Drop the false "vendored QR library" line; state it's a single
  self-contained, zero-dependency file and document offline use.
- Fix keyboard shortcuts to match the in-app help: remove the
  non-existent R toggle, add Alt+↑/↓ (reorder), 1–9 toggles a lane.
- "GM drum voice" → synthesized; set-list items load on click (no ▶
  auto-start); QR is an external service; clarify release.sh.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -7,21 +7,28 @@ pattern. Layering lanes produces polymeter and true ratio polyrhythm.
 
 **Live:** https://metronome.varasys.io
 
-It's a single page (`index.html`) plus a vendored QR library — no build step,
-no framework. State (presets, set lists, practice log, theme) lives in
-`localStorage`.
+It's a single, self‑contained `index.html` — **zero dependencies**: no framework,
+no build step, no bundled or CDN libraries, and nothing fetched at runtime. State
+(set lists, the practice log, theme and UI preferences) lives in `localStorage`.
+
+Because nothing loads from the network, you can save the page (`Ctrl`/`⌘`+`S`) and
+open it straight from disk to run fully offline. One catch from a local `file://`:
+the browser may not persist `localStorage` between sessions, so use **Export all**
+(set‑list **⋯** menu) to back up your work.
 
 ## Features
 
-- **Meter lanes** — grouping (odd meters), subdivision, GM drum voice, per‑beat
+- **Meter lanes** — grouping (odd meters), subdivision, a synthesized drum/percussion voice, per‑beat
   on/off pattern (rests), mute, live measure counter.
 - **Polyrhythm** — a per‑lane *poly* toggle fits a lane's beats evenly into lane 1's
   bar (e.g. 5‑over‑4, 3‑over‑2).
 - **Practice** — gap/mute trainer (play N / mute M bars) and a tempo ramp with a
   start BPM and signed step.
-- **Set lists** — named, ordered lists of saved setups; ▶ loads + starts an item,
-  **N** advances; each play is logged for cross‑day comparison.
-- **Sharing** — copy a link (with QR) to your current settings or a whole set list.
+- **Set lists** — named, ordered lists of saved setups; click an item to load it
+  (it switches live if you're already playing), **N** loads the next; each play is
+  logged for cross‑day comparison.
+- **Sharing** — copy a link to your current settings or a whole set list (with an
+  optional QR generated by an external service).
 - **Theming** — System / Light / Dark.
 
 ## The share language
@@ -99,21 +106,24 @@ In the set‑list panel's **⋯** menu:
 - **QR ↗** opens a third‑party QR service (api.qrserver.com) with the link in its
   URL so you can scan it on a phone. A banner warns you it's external — confirm the
   QR decodes to the shown link before trusting it. (No QR is generated locally.)
-- **Export all / Import file** back up presets + set lists + logs as a JSON file.
+- **Export all / Import file** back up your set lists and practice log as a JSON
+  file (a legacy `presets` field is included for backward compatibility).
 
 ## Keyboard shortcuts
 
 | Key | Action |
 |-----|--------|
-| `Space` | play / stop (except while typing in a text field) |
+| `Space` | play / stop (works everywhere except while typing in a text field) |
 | `T` | tap tempo |
 | `↑` / `↓` | tempo ±1 (`Shift` = ±10) |
 | `A` | add meter lane |
-| `1`–`9` | mute lane N |
-| `R` | toggle the set‑list panel |
-| `N` | next set‑list item |
+| `N` | load next set‑list item |
+| `Alt`+`↑` / `Alt`+`↓` | reorder the selected set‑list item |
+| `1`–`9` | enable / silence lane 1–9 |
 | `?` | shortcuts help |
-| `Esc` | close dialog / panel |
+| `Esc` | close the help / share dialog |
+
+(Arrow keys are left alone while a slider or dropdown is focused, so they still adjust it.)
 
 ## Versioning
 
@@ -122,8 +132,9 @@ In the set‑list panel's **⋯** menu:
 - **Formal** — a clean commit tagged `v<VERSION>` → `X.Y.Z`.
 - **Dev** — anything else → `X.Y.Z-dev.<utc-timestamp>.<short-sha>[.dirty]`.
 
-Cut a release with `./release.sh [X.Y.Z]` (bumps `VERSION` + tags `v<VERSION>`),
-then push the tag and deploy.
+Cut a release with `./release.sh [X.Y.Z]` — the optional arg bumps & commits
+`VERSION`; it then tags the current commit `v<VERSION>` (requires a clean tree).
+Push the tag, then deploy.
 
 ## Deploy