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Closes #1780. ## What Adds an opt-in **"Multibyte only"** toggle to the live map controls. When ON, packets whose path hash size is `< 2` bytes (single-byte, or unresolvable) are excluded from the entire live view — feed, map polylines/rain, and the packet counter — in both LIVE and REPLAY modes. - **Default OFF** — no behavior change for existing users. - Persisted in `localStorage` under `live-multibyte-only`. - Distinct from the existing global "hide 1-byte path hops" toggle: that filters individual hops within a path at every render site; this filters whole packets, on the live view only. They share no state. ## How - **`public/hop-filter.js`** — new pure, dependency-free classifier `MC_packetHashSize(rawHex, routeType)` returning `1|2|3`, or `0` when unresolvable. Reads the path-length byte from `raw_hex` (`(pathByte >> 6) + 1`), offset `5` for transport routes (route_type 0/3) else `1` — mirroring the existing `getPathLenOffset`/`computeBreakdownRanges` logic in `app.js`. Lives next to the existing `hopByteLen`/`MC_*` family; `app.js` is untouched (no duplication of the byte math). - **`public/live.js`** — `groupIsMultibyte(packets)` consumes that helper; applied at two render-time sites: the top of `renderPacketTree` (above the counter increment, so the counter reflects multibyte-only) and inside the `rebuildFeedList` group loop (so toggling re-filters the buffered feed). Toggle markup + change handler mirror the existing `liveFavoritesToggle` pattern. ## Why read from `raw_hex` and not the path hops The hash size is a property of the whole packet and is present even for zero-hop packets (where there are no hops to inspect), so reading the path-length byte is correct in all cases. Unresolvable size is treated as single-byte (excluded when ON) — we only show packets we can positively confirm are multibyte. ## Performance (hot path) The filter runs in the packet-render hot path, so: classification is **O(1) per packet group** — it reads the first resolvable observation's `raw_hex` (a short hex string, single `parseInt` of one byte) and short-circuits. No per-packet API calls, no allocation in the loop, no added O(n²). When the toggle is OFF (default) the check is a single boolean guard and does nothing else. The buffered-feed re-filter reuses the existing `rebuildFeedList` pass — no extra traversal. ## Tests - **Unit** (`test-live-multibyte-filter.js`, 9 cases): single/2-byte/3-byte classification, transport-route offset, missing/short/garbage `raw_hex` → 0, whitespace tolerance. - **E2E** (`test-live-multibyte-only-e2e.js`, Playwright): toggle present and defaults OFF; ON hides a single-byte packet while a multibyte one renders; OFF restores it; setting persists across reload. Registered in the CI live-E2E block in `deploy.yml`. ## Docs User-guide entry added in `docs/user-guide/live.md`. --------- Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>