feat(icons): shrink the Android adaptive mark 25%, give old square launchers the full-bleed master

The adaptive foreground's asterisk grazed the round mask's safe zone. Scale the
foreground mark 0.75 about the icon centre (25% smaller, the letter-to-star
arrangement unchanged) so it sits well inside the 61% safe zone. Independently,
the legacy square ic_launcher.png now renders the full-bleed master instead of
the safe-zone composite, so old Android (< API 26) shows a large mark rather
than a shrunk one; the legacy round icon keeps the safe-zone composite (a round
mask would clip the master's corner star). Regenerate the layer set, Android
res and the brandbook foreground previews; update ICON_BRANDBOOK.md / ICONS.md.

assets/icons/brand/build-android-res.mjs

@@ -19,6 +19,11 @@ const uri = p => 'data:image/png;base64,' + readFileSync(p).toString('base64');
 const BG = uri(join(ROOT, 'ui', 'assets', 'icon-background.png'));
 const FG = uri(join(ROOT, 'ui', 'assets', 'icon-foreground.png'));
 const MONO = uri(join(DIR, 'android-monochrome.png'));
+// The full-bleed master (square tile + master mark) — the legacy SQUARE launcher (API < 26)
+// uses it so old Android shows a large mark rather than the safe-zone foreground shrunk into
+// the middle. The round legacy icon keeps the safe-zone composite (a round mask would clip
+// the master's corner ✻).
+const MASTER = uri(join(ROOT, 'ui', 'assets', 'icon.png'));
 
 // density: [adaptive-layer px (108 dp), legacy launcher px (48 dp)]
 const D = { ldpi: [81, 36], mdpi: [108, 48], hdpi: [162, 72], xhdpi: [216, 96], xxhdpi: [324, 144], xxxhdpi: [432, 192] };
@@ -38,8 +43,9 @@ for (const [d, [fg, lg]] of Object.entries(D)) {
   writeFileSync(join(dir, 'ic_launcher_background.png'), await shot(im(BG, fg), fg, false));
   writeFileSync(join(dir, 'ic_launcher_foreground.png'), await shot(im(FG, fg), fg, true));
   writeFileSync(join(dir, 'ic_launcher_monochrome.png'), await shot(im(MONO, fg), fg, true));
-  const comp = `<div style="position:relative;width:${lg}px;height:${lg}px">${im(BG, lg)}<div style="position:absolute;inset:0">${im(FG, lg)}</div></div>`;
-  writeFileSync(join(dir, 'ic_launcher.png'), await shot(comp, lg, false));
+  // Square launcher: the full-bleed master (large mark). Round launcher: the safe-zone
+  // composite, circle-clipped (the master's corner ✻ would be clipped by the round mask).
+  writeFileSync(join(dir, 'ic_launcher.png'), await shot(im(MASTER, lg), lg, false));
   const round = `<div style="width:${lg}px;height:${lg}px;border-radius:50%;overflow:hidden;position:relative">${im(BG, lg)}<div style="position:absolute;inset:0">${im(FG, lg)}</div></div>`;
   writeFileSync(join(dir, 'ic_launcher_round.png'), await shot(round, lg, true));
   console.log('mipmap-' + d, 'ok');

assets/icons/brand/build-icon.mjs

@@ -33,8 +33,12 @@ const SHADE = 0.15;                   // black, this alpha bottom-left -> transp
 // The mark, placed for the standalone master (bottom-right biased, full-bleed):
 const MASTER = { lh: 0.6055, lc: [0.4814, 0.4922], sd: 0.1729, sc: [0.7881, 0.7881] };
 // The mark, placed for the Android foreground layer (centred-ish inside the 61% safe
-// zone, nudged right 8% / down 3% for optical balance under the round mask; smaller ✻):
-const FOREGROUND = { lh: 0.5391, lc: [0.5234, 0.4951], sd: 0.1318, sc: [0.7627, 0.7266] };
+// zone, nudged right 8% / down 3% for optical balance under the round mask; smaller ✻).
+// Every value is the earlier placement scaled 0.75 about the icon centre (0.5, 0.5): the
+// whole mark is 25% smaller, its «Э»↔✻ arrangement unchanged, so the ✻ that used to graze
+// the round mask now sits well inside the safe zone. Round-mask launchers (adaptive + the
+// legacy round icon) get more breathing room; the full-bleed master is untouched.
+const FOREGROUND = { lh: 0.4043, lc: [0.5176, 0.4963], sd: 0.0989, sc: [0.6970, 0.6700] };
 
 const PALETTE = {
   light: { wood: '#e6b053', ink: '#5a3a12', grain: '#d8a54e' },