tighten remaining voice outline review items

- join street pieces at up to 3 m again (inclusive), as before the shared stitcher
- share one default outline tile source across outline rung instances
- cover Japanese and Thai street names that differ only by a mark
- restore main's text for formatting-only CURRENT-STATE hunks

src/sources/featureGeometry.js

@@ -15,15 +15,18 @@ export function ringAreaM2(ring) {
 }
 
 /**
- * Join line pieces whose ends meet (within `toleranceM`) into as few chains as
- * possible. Each chain grows greedily from the first unused piece.
+ * Join line pieces whose ends meet (closer than `toleranceM`, or at most it
+ * when `inclusive`) into as few chains as possible. Each chain grows greedily
+ * from the first unused piece.
  */
 export function stitchLines(
   segments,
-  { toleranceM = 2, maxChains = Infinity } = {},
+  { toleranceM = 2, inclusive = false, maxChains = Infinity } = {},
 ) {
-  const same = (a, b) =>
-    approximateDistanceM(a[1], a[0], b[1], b[0]) < toleranceM;
+  const same = (a, b) => {
+    const d = approximateDistanceM(a[1], a[0], b[1], b[0]);
+    return inclusive ? d <= toleranceM : d < toleranceM;
+  };
   const remaining = segments.map((s) => s.slice());
   const chains = [];
   while (remaining.length && chains.length < maxChains) {

src/sources/openFreeMapOutlines.js

@@ -383,7 +383,7 @@ export function streetFromTiles(
   if (!pieces.length) return null;
   const chains = stitchLines(
     pieces.filter((piece) => piece.length >= 2),
-    { toleranceM: JOIN_TOLERANCE_M },
+    { toleranceM: JOIN_TOLERANCE_M, inclusive: true },
   )
     .map((line) => ({ line, length: lengthM(line) }))
     .filter((entry) => entry.length >= STREET_MIN_CHAIN_M)

src/sources/openFreeMapOutlines.test.mjs

@@ -61,6 +61,14 @@ test('street names compare with abbreviations and a leading direction only', ()
   assert.ok(!streetNameMatches('कुल मार्ग', 'काली मार्ग'));
   assert.ok(streetNameMatches('काली मार्ग', 'काली मार्ग'));
   assert.ok(streetNameMatches('Champs-Élysées', 'Champs Elysees'));
+  // Japanese: dakuten and handakuten are kept, so these stay distinct.
+  assert.ok(!streetNameMatches('ハシ通り', 'バシ通り'));
+  assert.ok(!streetNameMatches('ハシ通り', 'パシ通り'));
+  assert.ok(streetNameMatches('表参道', '表参道'));
+  // Thai: vowel and tone marks are kept.
+  assert.ok(!streetNameMatches('ถนนสุขุมวิท', 'ถนนสุขมวท'));
+  assert.ok(!streetNameMatches('ถนนข้าวสาร', 'ถนนขาวสาร'));
+  assert.ok(streetNameMatches('ถนนสุขุมวิท', 'ถนนสุขุมวิท'));
 });
 
 test('same-name segments merge into polylines around the point (Congress Avenue)', () => {
@@ -112,6 +120,23 @@ test('merge joins reversed and out-of-order pieces and keeps gaps apart', () =>
     [0.011, 0],
   ]; // separate
   const chains = stitchLines([b, c, a], { toleranceM: 3 });
+
+  test('stitchLines joins at exactly the tolerance only when inclusive', () => {
+    const a = [
+      [0, 0],
+      [0.001, 0],
+    ];
+    const b = [
+      [0.00102, 0],
+      [0.002, 0],
+    ];
+    const gap = approximateDistanceM(0, 0.001, 0, 0.00102);
+    assert.equal(
+      stitchLines([a, b], { toleranceM: gap, inclusive: true }).length,
+      1,
+    );
+    assert.equal(stitchLines([a, b], { toleranceM: gap }).length, 2);
+  });
   assert.equal(chains.length, 2);
   assert.equal(chains.find((ch) => ch.length === 3).length, 3);
 });