feat(ui): establish premium design foundation from mockups

Extract design tokens from the mockup set (F:\Pictures\website\jobtracker\new
dashboard, pipeline, job-workspace, features, workflow screens) into the
central theme so every screen picks the change up automatically:

- Heading weight: h1-h4 go bold/black (800/700) to match the mockups' heavy
  display type; h5/h6 stay a lighter semibold so dense screens don't turn
  into a wall of black text.
- Card shadow: replace the flat 1px "section" shadow + visible border with a
  soft floating shadow and no border, matching how mockup cards sit on the
  grey page background.
- Border radius: 10/12/8px -> 14/16/10px across shape/card/button defaults,
  matching the mockups' rounder corners.
- New GradientButton component wrapping the mockup's signature indigo->cyan
  CTA gradient ("Tailor my CV for this role", "See the interface tour"),
  reserved for the single most important AI-assist/hero action per screen.

The dark navy sidebar (#0f172a) already matched the mockups from an earlier
pass -- untouched here.

Verified: tsc clean, full frontend suite green (65/65). Live visual
screenshot verification wasn't possible -- the Browser pane's screenshot
tool times out in this environment; verified structurally via read_page
and the app rendering without console errors instead.

job-tracker-ui/src/components/GradientButton.tsx

@@ -0,0 +1,33 @@
+import React from "react";
+
+import Button, { ButtonProps } from "@mui/material/Button";
+
+import { GRADIENT_CTA } from "../theme";
+
+/**
+ * The mockup's gradient AI/primary-action pill ("Tailor my CV for this role", "See the
+ * interface tour"). Reserve this for the single most important AI-assist or hero action on a
+ * screen -- everything else stays a plain contained/outlined Button, or the gradient stops
+ * reading as a signal and becomes wallpaper.
+ */
+export default function GradientButton({ sx, disabled, ...props }: ButtonProps) {
+  return (
+    <Button
+      variant="contained"
+      disableElevation
+      disabled={disabled}
+      sx={[
+        (theme: any) => ({
+          background: disabled ? undefined : GRADIENT_CTA,
+          color: disabled ? undefined : "#fff",
+          boxShadow: disabled ? undefined : theme.vars.customShadows.gradientButton,
+          "&:hover": disabled
+            ? undefined
+            : { background: GRADIENT_CTA, filter: "brightness(1.06)", boxShadow: theme.vars.customShadows.gradientButton },
+        }),
+        ...(Array.isArray(sx) ? sx : sx ? [sx] : []),
+      ]}
+      {...props}
+    />
+  );
+}

job-tracker-ui/src/theme.ts

@@ -173,30 +173,49 @@ function buildCustomShadows(palette: any) {
   const primaryColor = palette.primary.main;
   return {
     button: `0px 0.711px 1.422px 0px ${alpha(shadowColor, 0.05)}`,
-    section: `0px 1px 2px 0px ${alpha(shadowColor, 0.07)}`,
+    // Mockup cards float on the grey page background with no visible border, just a soft,
+    // fairly generous shadow (dashboard stat tiles, pipeline columns' cards, job-workspace
+    // panels) -- the old 1px "section" shadow read as flat/bordered rather than elevated.
+    section: `0px 1px 2px 0px ${alpha(shadowColor, 0.04)}, 0px 8px 24px -12px ${alpha(shadowColor, 0.12)}`,
     tooltip: `0px 12px 16px -4px ${alpha(shadowColor, 0.08)}, 0px 4px 6px -2px ${alpha(shadowColor, 0.03)}`,
     focus: `0px 0px 0px 3px ${alpha(primaryColor, 0.2)}`,
+    // Gradient CTA (mockup's "Tailor my CV" / "See the interface tour" buttons) gets its own
+    // colored glow instead of the flat neutral button shadow.
+    gradientButton: `0px 4px 14px -4px ${alpha(primaryColor, 0.45)}`,
   };
 }
 
+// Mockup's signature AI/primary-action gradient (dashboard "Tailor my CV", landing "See the
+// interface tour"). Exported so every gradient CTA across the app stays pixel-identical
+// instead of each screen inventing its own two-color mix -- consumed via <GradientButton>
+// (src/components/GradientButton.tsx), not applied as a MUI Button variant (MUI's variant
+// override machinery needs TS module augmentation for a genuinely new variant name; a plain
+// wrapper component is far less code for the same result).
+export const GRADIENT_CTA = "linear-gradient(90deg, #6366F1 0%, #22D3EE 100%)";
+
 function buildTypography() {
   return {
     fontFamily: "'Archivo', system-ui, -apple-system, Segoe UI, Roboto, Helvetica Neue, Arial, sans-serif",
     letterSpacing: 0,
-    h1: { fontWeight: 500, fontSize: 36, lineHeight: "40px" },
-    h2: { fontWeight: 500, fontSize: 30, lineHeight: "34px" },
-    h3: { fontWeight: 500, fontSize: 26, lineHeight: "30px" },
-    h4: { fontWeight: 500, fontSize: 22, lineHeight: "26px" },
-    h5: { fontWeight: 500, fontSize: 18, lineHeight: "22px" },
-    h6: { fontWeight: 500, fontSize: 16, lineHeight: "20px" },
-    subtitle1: { fontWeight: 500, fontSize: 14, lineHeight: "18px" },
-    subtitle2: { fontWeight: 500, fontSize: 13, lineHeight: "17px" },
+    // Mockup headings (F:\Pictures\website\jobtracker\new) are bold/black-weight display
+    // type ("Dashboard", "One workspace for the whole search") -- 500 across the board read
+    // as noticeably lighter/flatter than that reference. h1-h4 (page titles, hero, section
+    // headers) go heavy; h5/h6 (card titles, in-context labels) stay a lighter semibold so
+    // dense screens don't turn into a wall of black text.
+    h1: { fontWeight: 800, fontSize: 36, lineHeight: "40px", letterSpacing: "-0.02em" },
+    h2: { fontWeight: 800, fontSize: 30, lineHeight: "34px", letterSpacing: "-0.02em" },
+    h3: { fontWeight: 800, fontSize: 26, lineHeight: "30px", letterSpacing: "-0.01em" },
+    h4: { fontWeight: 700, fontSize: 22, lineHeight: "26px", letterSpacing: "-0.01em" },
+    h5: { fontWeight: 700, fontSize: 18, lineHeight: "22px" },
+    h6: { fontWeight: 600, fontSize: 16, lineHeight: "20px" },
+    subtitle1: { fontWeight: 600, fontSize: 14, lineHeight: "18px" },
+    subtitle2: { fontWeight: 600, fontSize: 13, lineHeight: "17px" },
     body1: { fontWeight: 400, fontSize: 14, lineHeight: "18px" },
     body2: { fontWeight: 400, fontSize: 13, lineHeight: "17px" },
     caption: { fontWeight: 400, fontSize: 12, lineHeight: "16px", letterSpacing: 0 },
-    overline: { fontWeight: 600, fontSize: 11, lineHeight: "14px", letterSpacing: "0.08em", textTransform: "uppercase" as const },
+    overline: { fontWeight: 700, fontSize: 11, lineHeight: "14px", letterSpacing: "0.08em", textTransform: "uppercase" as const },
     caption1: { fontWeight: 500, fontSize: 12, lineHeight: "16px", letterSpacing: 0 },
-    button: { textTransform: "capitalize" as const },
+    button: { textTransform: "capitalize" as const, fontWeight: 600 },
   };
 }
 
@@ -222,7 +241,9 @@ export const getTheme = (_mode: "light" | "dark") => {
       light: { palette: lightPalette, customShadows: buildCustomShadows(lightPalette) },
       dark: { palette: darkPalette, customShadows: buildCustomShadows(darkPalette) },
     },
-    shape: { borderRadius: 10 },
+    // Mockup radius reads noticeably rounder than the previous 10/8px defaults across cards,
+    // stat tiles, kanban cards and buttons.
+    shape: { borderRadius: 14 },
     typography: buildTypography() as any,
   } as any) as any;
 
@@ -249,8 +270,9 @@ export const getTheme = (_mode: "light" | "dark") => {
       defaultProps: { elevation: 0 },
       styleOverrides: {
         root: ({ theme }: any) => ({
-          border: `1px solid ${theme.vars.palette.divider}`,
-          borderRadius: 12,
+          // No border -- mockup cards float on the grey page background purely via shadow.
+          border: "none",
+          borderRadius: 16,
           backgroundImage: "none",
           boxShadow: theme.vars.customShadows.section,
         }),
@@ -260,7 +282,7 @@ export const getTheme = (_mode: "light" | "dark") => {
       defaultProps: { disableFocusRipple: true },
       styleOverrides: {
         root: ({ theme }: any) => ({
-          borderRadius: 8,
+          borderRadius: 10,
           boxShadow: theme.vars.customShadows.button,
           "&:hover": { boxShadow: theme.vars.customShadows.button },
         }),