diff --git a/e2e/settings-mobile-consistency.spec.ts b/e2e/settings-mobile-consistency.spec.ts
new file mode 100644
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+++ b/e2e/settings-mobile-consistency.spec.ts
@@ -0,0 +1,176 @@
+import { expect, test } from "@playwright/test";
+
+import { STORAGE_STATE_PATH } from "./setup/global-setup";
+
+/**
+ * v1.4.19 A6 — Settings consistency snapshot at Pixel-5 (393 CSS px).
+ *
+ * Marc reported four interlocking inconsistencies on the mobile
+ * settings shell:
+ *
+ *   1. Input heights differed across sections — `<Input>` rendered at
+ *      36 px, the AI active-provider native `<select>` at 40 px, the
+ *      AI add-provider select at 32 px, the Dashboard "Compare to"
+ *      `<SelectTrigger>` at 44 px. Same shell, four heights.
+ *   2. Action buttons inside title rows ("Change password", "Restart
+ *      onboarding tour") could overflow the parent card on narrow
+ *      viewports because the `flex justify-between` row never wrapped.
+ *   3. The Sprache (language) select was buried half-way down the
+ *      Profile card, paired with a profile-data field (date of birth).
+ *   4. Card-internal `space-y-*` rhythm varied between 3 / 4 / 5 / 6.
+ *
+ * The fixes:
+ *
+ *   - `h-9` (36 px) is the canonical input height across Settings.
+ *   - Title + action rows use `flex-col` on `<sm` and `flex-row` on
+ *     `>=sm` so the action button stacks below on mobile.
+ *   - Sprache lifted into its own row at the bottom of the Profile
+ *     card, `max-w-xs` on `>=sm` so it doesn't render heavier than
+ *     other fields.
+ *   - Card-internal spacing standardised on `space-y-4`.
+ *
+ * This spec captures the post-fix invariants. It is mobile-only — the
+ * desktop project skips it.
+ */
+test.describe("Settings mobile consistency (Pixel 5)", () => {
+  test.use({ storageState: STORAGE_STATE_PATH });
+
+  test.beforeEach(({}, testInfo) => {
+    test.skip(testInfo.project.name !== "chromium-mobile", "mobile-only spec");
+  });
+
+  test("/settings/account: every form input renders at 36 px", async ({
+    page,
+  }) => {
+    await page.goto("/settings/account", { waitUntil: "networkidle" });
+    await page.waitForLoadState("networkidle");
+    await expect(page.getByLabel(/username/i)).toBeVisible();
+
+    const formInputs = await page
+      .locator(
+        'section input:not([type="checkbox"]):not([type="radio"]):not([type="hidden"]), section select',
+      )
+      .evaluateAll((els) =>
+        els.map((el) => ({
+          id: el.id || el.getAttribute("name") || "",
+          tag: el.tagName,
+          type: el.getAttribute("type") || "",
+          height: Math.round(el.getBoundingClientRect().height),
+        })),
+      );
+
+    expect(formInputs.length).toBeGreaterThan(0);
+    for (const inp of formInputs) {
+      expect.soft(inp.height, `${inp.tag}#${inp.id} (${inp.type})`).toBe(36);
+    }
+  });
+
+  test("/settings/account: action buttons do not overflow their cards", async ({
+    page,
+  }) => {
+    await page.goto("/settings/account", { waitUntil: "networkidle" });
+    await page.waitForLoadState("networkidle");
+
+    // Both the password card and the tour card need the action button
+    // to live within (or above the bottom of) the parent card. On
+    // mobile the button stacks below the title — it's allowed to
+    // extend the card's height, but not push past the right edge.
+    const overflowCheck = await page.evaluate(() => {
+      const buttons = Array.from(document.querySelectorAll("button"));
+      const targets = buttons.filter((b) => {
+        const t = (b.textContent || "").trim().toLowerCase();
+        return (
+          t.includes("change password") ||
+          t.includes("passwort ändern") ||
+          t.includes("restart onboarding") ||
+          t.includes("onboarding-tour")
+        );
+      });
+      return targets.map((b) => {
+        const card = b.closest(".bg-card");
+        const cardRect = card?.getBoundingClientRect();
+        const btnRect = b.getBoundingClientRect();
+        return {
+          text: (b.textContent || "").trim(),
+          btnRight: Math.round(btnRect.right),
+          cardRight: cardRect ? Math.round(cardRect.right) : null,
+        };
+      });
+    });
+
+    expect(
+      overflowCheck.length,
+      "expected to find password + tour buttons",
+    ).toBeGreaterThanOrEqual(2);
+
+    for (const t of overflowCheck) {
+      expect(t.cardRight, `card for "${t.text}"`).not.toBeNull();
+      // 1 px tolerance for sub-pixel rounding.
+      expect
+        .soft(
+          t.btnRight,
+          `"${t.text}" right=${t.btnRight} must stay within card right=${t.cardRight}`,
+        )
+        .toBeLessThanOrEqual((t.cardRight ?? 0) + 1);
+    }
+  });
+
+  test("/settings/account: Sprache select is in its own row, not paired with date-of-birth", async ({
+    page,
+  }) => {
+    await page.goto("/settings/account", { waitUntil: "networkidle" });
+    await page.waitForLoadState("networkidle");
+
+    // The Sprache native select must NOT live inside the same `grid`
+    // ancestor as the date-of-birth input. Pre-fix they shared
+    // `<div class="grid sm:grid-cols-2"> dob | language </div>`.
+    const sharedGrid = await page.evaluate(() => {
+      const lang = document.getElementById("language-select");
+      const dob = document.getElementById("dob");
+      if (!lang || !dob) return { found: false, sharedGrid: false };
+      const langGrid = lang.closest('[class*="grid"]');
+      const dobGrid = dob.closest('[class*="grid"]');
+      return {
+        found: true,
+        sharedGrid: langGrid !== null && langGrid === dobGrid,
+      };
+    });
+
+    expect(sharedGrid.found, "language + dob fields must exist").toBe(true);
+    expect(sharedGrid.sharedGrid, "language + dob must NOT share a grid").toBe(
+      false,
+    );
+  });
+
+  test("/settings/dashboard: Compare-to trigger renders at 36 px", async ({
+    page,
+  }) => {
+    await page.goto("/settings/dashboard", { waitUntil: "networkidle" });
+    await page.waitForLoadState("networkidle");
+
+    const trigger = page.locator("#comparison-baseline");
+    await expect(trigger).toBeVisible();
+    const h = await trigger.evaluate(
+      (el) => el.getBoundingClientRect().height,
+    );
+    expect(Math.round(h)).toBe(36);
+  });
+
+  test("/settings/ai: every native select renders at 36 px", async ({
+    page,
+  }) => {
+    await page.goto("/settings/ai", { waitUntil: "networkidle" });
+    await page.waitForLoadState("networkidle");
+
+    const heights = await page
+      .locator("section select")
+      .evaluateAll((els) =>
+        els.map((el) => Math.round(el.getBoundingClientRect().height)),
+      );
+
+    expect(heights.length).toBeGreaterThan(0);
+    for (const h of heights) {
+      expect.soft(h).toBe(36);
+    }
+  });
+});