feat: fuzzy-match disposition names to the 5 canonical ITC dispositions

Hand-typed disposition text (submitted-list free text, BCP's own field)
often has small typos like "Priority Assests". Match it against the fixed
Purge the Foe / Take and Hold / Priority Assets / Disruption / Reconnaissance
list via Levenshtein distance so typo'd variants merge into the correct bar
instead of forking off as duplicates.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/main.js

@@ -114,6 +114,48 @@ const TOKEN_KEY = "bcp_auth_token";
 const getToken = () => { try { return localStorage.getItem(TOKEN_KEY) || ""; } catch { return ""; } };
 const setToken = t => { try { t ? localStorage.setItem(TOKEN_KEY, t) : localStorage.removeItem(TOKEN_KEY); } catch {} };
 
+// This event tracks the five ITC-standard mission dispositions. Hand-typed
+// sources (a "Dispositions Used:" line in a submitted list, BCP's own free
+// text) routinely have small typos (e.g. "Priority Assests"), so every
+// disposition value is fuzzy-matched against this fixed list before being
+// counted or displayed, keeping typo'd variants from forking off as their
+// own duplicate bar.
+const CANONICAL_DISPOSITIONS = ["Purge the Foe", "Take and Hold", "Priority Assets", "Disruption", "Reconnaissance"];
+
+function levenshtein(a, b) {
+  const m = a.length, n = b.length;
+  if (!m) return n;
+  if (!n) return m;
+  let prev = Array.from({ length: n + 1 }, (_, i) => i);
+  for (let i = 1; i <= m; i++) {
+    const cur = [i];
+    for (let j = 1; j <= n; j++) {
+      cur[j] = a[i - 1] === b[j - 1] ? prev[j - 1] : 1 + Math.min(prev[j - 1], prev[j], cur[j - 1]);
+    }
+    prev = cur;
+  }
+  return prev[n];
+}
+
+// Nearest canonical disposition, or null if nothing is close enough to be
+// confident it's a typo rather than unrelated text. Threshold scales with
+// name length (~25%) so e.g. "Priority Assests" (1 char off "Priority
+// Assets") matches, but a short unrelated line doesn't accidentally match
+// "Disruption".
+function closestDisposition(name) {
+  const norm = String(name || "").trim().toLowerCase().replace(/[^a-z ]/g, "").replace(/\s+/g, " ");
+  if (!norm) return null;
+  let best = null, bestDist = Infinity;
+  for (const canonical of CANONICAL_DISPOSITIONS) {
+    const dist = levenshtein(norm, canonical.toLowerCase());
+    if (dist < bestDist) { bestDist = dist; best = canonical; }
+  }
+  const threshold = Math.max(1, Math.round(best.length * 0.25));
+  return bestDist <= threshold ? best : null;
+}
+
+const correctDisposition = name => closestDisposition(name) || name;
+
 // The vocabulary of disposition names is whatever this event's own roster
 // already shows (e.g. "Take and Hold", "Priority Assets", …) — deriving it
 // from the event rather than hardcoding keeps this working for other game
@@ -172,11 +214,13 @@ function extractFactionAndDisposition(armyList, knownDisp) {
   const dm = text.match(/^Dispositions?\s+Used:\s*(.+)$/im);
   if (dm) {
     const captured = dm[1].trim();
-    disposition = knownDisp.get(captured.toLowerCase()) || captured;
+    disposition = knownDisp.get(captured.toLowerCase()) || closestDisposition(captured) || captured;
   }
   if (!disposition) {
     for (const rawLine of text.split("\n")) {
-      const canonical = knownDisp.get(rawLine.trim().toLowerCase());
+      const line = rawLine.trim();
+      if (!line) continue;
+      const canonical = knownDisp.get(line.toLowerCase()) || closestDisposition(line);
       if (canonical) { disposition = canonical; break; }
     }
   }
@@ -546,7 +590,11 @@ function clearBanner() {
 function render() {
   if (!state) return;
   const { event, teamplayers, isTeamEvent, itcRanks, itcLoading, backfill, backfillStatus } = state;
-  const roster = applyBackfill(state.roster, backfill);
+  const roster = applyBackfill(state.roster, backfill).map(r =>
+    r.subFaction?.name
+      ? { ...r, subFaction: { ...r.subFaction, name: correctDisposition(r.subFaction.name) } }
+      : r
+  );
   const teams = isTeamEvent ? computeTeamRollups(roster, teamplayers) : [];
 
   const tokenStatusEl = $("bcp-token-status");