Apple HIG pass: liquid-glass chrome + iOS SegmentedControl + ThresholdMeter

Water log mobile field experience (PIN → Headgates → Log → Success):

* Brand rename: "Tuxedo Ditch Co." → "Tuxedo Corn" everywhere it
  was a stale reference (page metadata + admin Today tab caption).
  Constants already say Tuxedo Corn; this just aligns the stragglers.

* Tab bar (Headgates | Time): pill pair → real UISegmentedControl.
  MiniSegmented lives next to TabBar in MobileWaterApp.tsx and uses
  the same ResizeObserver-measure + spring-timing pattern as the
  existing SegmentedControl — feels like one widget at two sizes
  (this one at 32pt, the unit selector at 44pt).

* Liquid-glass chrome (recipe applied 5×, mirrored on the bottom
  submit bar): linear-gradient background + blur(24px) +
  saturate(180%) + inset top highlight + inset bottom hairline.
  TabBar, HeadgateList top nav, LogForm top nav, LogForm sticky
  submit bar, FieldPinScreen + SuccessScreen brand strips.

* ThresholdMeter (new component, mobile/ThresholdMeter.tsx): the
  screen's signature. A live "blip" indicator under the 44pt
  measurement input that ties the form to its real domain (a
  worker reading a real gauge) instead of being a decorative
  gauge trophy. Track + optional colored zones (red·green·red)
  + thumb that slides on Apple's spring curve + color-coded
  zone label. Mirrors Apple's Volume Limit / Screen Time sliders.

* i18n: 9 new zone labels per language (zoneBelowNormal,
  zoneAboveAlert, zoneInRange, zoneBelowAlert, zoneAboveMin,
  zoneReading, zoneTypeToLog, meterNormalRange + ES twins).
  Legacy normalRange/alertAbove/alertBelow signatures widened
  to accept pre-formatted strings so integer units render clean.

* Updated water-log-i18n unit test for the wider signatures.
  All 27 tests pass; tsc + eslint clean.

tests/unit/water-log-i18n.test.ts

@@ -252,21 +252,21 @@ describe("Mobile label helpers (interpolation)", () => {
   });
 
   it("log.normalRange interpolates the bounds + unit", () => {
-    expect(LABELS.en.log.normalRange(2, 8, "CFS")).toBe(
+    expect(LABELS.en.log.normalRange("2", "8", "CFS")).toBe(
       "Normal range: 2 – 8 CFS",
     );
-    expect(LABELS.es.log.normalRange(2, 8, "CFS")).toBe(
+    expect(LABELS.es.log.normalRange("2", "8", "CFS")).toBe(
       "Rango normal: 2 – 8 CFS",
     );
   });
 
   it("log.alertAbove / alertBelow interpolate single bound + unit", () => {
-    expect(LABELS.en.log.alertAbove(10, "CFS")).toBe("Alert above 10 CFS");
-    expect(LABELS.es.log.alertAbove(10, "CFS")).toBe(
+    expect(LABELS.en.log.alertAbove("10", "CFS")).toBe("Alert above 10 CFS");
+    expect(LABELS.es.log.alertAbove("10", "CFS")).toBe(
       "Alerta arriba de 10 CFS",
     );
-    expect(LABELS.en.log.alertBelow(1, "CFS")).toBe("Alert below 1 CFS");
-    expect(LABELS.es.log.alertBelow(1, "CFS")).toBe("Alerta abajo de 1 CFS");
+    expect(LABELS.en.log.alertBelow("1", "CFS")).toBe("Alert below 1 CFS");
+    expect(LABELS.es.log.alertBelow("1", "CFS")).toBe("Alerta abajo de 1 CFS");
   });
 
   it("success.loggedBy interpolates the irrigator name", () => {