feat(#22): Driver profile page

Implemented by claude via .agents/dev dispatch.

frontend/src/pages/ChampionshipPage.tsx

@@ -1,5 +1,6 @@
 import { useMemo, useState } from 'react'
 import { useQuery } from '@tanstack/react-query'
+import { Link } from '@tanstack/react-router'
 import { fetchChampionshipHub, fetchSeasons } from '../api'
 import { teamColor } from '../utils'
 import type { ChampHubDriver, ChampionshipHub } from '../types'
@@ -242,6 +243,7 @@ function ChampionshipBody({ hub, view, setView }: BodyProps) {
           leaderPoints={leader.points}
           titleMath={titleMath}
           roundsLeft={hub.rounds_left}
+          season={hub.season}
         />
       )}
       {view === 'constructors' && <ConstructorsView hub={hub} />}
@@ -271,11 +273,13 @@ function DriversView({
   leaderPoints,
   titleMath,
   roundsLeft,
+  season,
 }: {
   enriched: EnrichedDriver[]
   leaderPoints: number
   titleMath: string
   roundsLeft: number
+  season: number
 }) {
   const podium = enriched.slice(0, 3)
   return (
@@ -360,12 +364,19 @@ function DriversView({
                   P{e.pos}
                 </td>
                 <td>
-                  <div className="champ-drv">
+                  <Link
+                    to="/drivers/$driverNumber"
+                    params={{ driverNumber: String(e.d.driver_number) }}
+                    search={{ year: season }}
+                    className="champ-drv"
+                    style={{ color: 'inherit', textDecoration: 'none' }}
+                    data-testid={`champ-driver-link-${e.d.driver_number}`}
+                  >
                     <span className="champ-drv-bar" style={{ background: e.color }} />
                     <span className="champ-drv-code mono">{e.d.name_acronym}</span>
                     <span className="champ-drv-name">{e.d.full_name}</span>
                     <span className="champ-drv-num mono">#{e.d.driver_number}</span>
-                  </div>
+                  </Link>
                 </td>
                 <td className="champ-td-team">{e.d.team_name}</td>
                 <td className="r mono champ-td-pts">{fmtPts(e.d.points)}</td>

frontend/src/pages/DriverProfilePage.tsx

@@ -0,0 +1,369 @@
+import { useQuery } from '@tanstack/react-query'
+import { Link } from '@tanstack/react-router'
+import { fetchDriverSummary, fetchSeasons } from '../api'
+import { teamColor } from '../utils'
+import { countryFlag } from '../lib/gpIdentity'
+import {
+  formatDelta,
+  formatPosition,
+  gridFinishDeltas,
+  type RoundDelta,
+} from '../lib/driverProfile'
+import type { DriverSummary } from '../types'
+import '../styles/driver-profile.css'
+
+interface Props {
+  driverNumber: number
+  year?: number
+}
+
+function fmtPts(n: number): string {
+  return Number.isInteger(n) ? String(n) : n.toFixed(1)
+}
+
+export function DriverProfilePage({ driverNumber, year }: Props) {
+  // Without an explicit ?year=, default to the latest ingested season; if the
+  // seasons list is empty/unavailable the backend falls back to the current year.
+  const seasonsQuery = useQuery({
+    queryKey: ['seasons'],
+    queryFn: fetchSeasons,
+    enabled: year == null,
+  })
+  const resolvedYear = year ?? seasonsQuery.data?.[0]
+  const seasonsSettled = year != null || !seasonsQuery.isLoading
+
+  const summaryQuery = useQuery({
+    queryKey: ['driver-summary', driverNumber, resolvedYear ?? 'latest'],
+    queryFn: () => fetchDriverSummary(driverNumber, resolvedYear),
+    enabled: seasonsSettled && driverNumber > 0,
+    staleTime: 5 * 60_000,
+  })
+
+  if (driverNumber <= 0) {
+    return <div className="page error-box">Invalid driver number</div>
+  }
+  if (!seasonsSettled || summaryQuery.isLoading) {
+    return <div className="page loading-state">loading driver profile…</div>
+  }
+  if (summaryQuery.isError) {
+    return (
+      <div className="page error-box">
+        {summaryQuery.error instanceof Error
+          ? summaryQuery.error.message
+          : 'Failed to load driver profile'}
+      </div>
+    )
+  }
+  const summary = summaryQuery.data
+  if (!summary) {
+    return <div className="page error-box">No driver data</div>
+  }
+  return <DriverProfileBody summary={summary} />
+}
+
+function DriverProfileBody({ summary }: { summary: DriverSummary }) {
+  const color = teamColor(summary.team_colour)
+  const deltas = gridFinishDeltas(summary.rounds)
+
+  return (
+    <div className="dp-page" data-testid="driver-profile">
+      <header className="dp-header" data-testid="dp-header" style={{ borderLeftColor: color }}>
+        <div className="dp-identity">
+          <div className="dp-title-row">
+            <span className="dp-code mono">{summary.name_acronym || `#${summary.driver_number}`}</span>
+            <span className="dp-num mono" style={{ color }}>
+              #{summary.driver_number}
+            </span>
+          </div>
+          <h1 className="dp-name">{summary.full_name || `Driver ${summary.driver_number}`}</h1>
+          <div className="dp-team">
+            <span className="dp-team-swatch" style={{ background: color }} />
+            {summary.team_name || 'Unknown team'}
+            <span className="dp-season mono">{summary.season}</span>
+          </div>
+        </div>
+        <div className="dp-stat-rail">
+          <div className="dp-stat">
+            <div className="dp-stat-value mono">{summary.position > 0 ? `P${summary.position}` : '—'}</div>
+            <div className="dp-stat-label">Championship</div>
+          </div>
+          <div className="dp-stat">
+            <div className="dp-stat-value mono">{fmtPts(summary.points)}</div>
+            <div className="dp-stat-label">Points</div>
+          </div>
+          <div className="dp-stat">
+            <div className="dp-stat-value mono">{summary.wins}</div>
+            <div className="dp-stat-label">Wins</div>
+          </div>
+          <div className="dp-stat">
+            <div className="dp-stat-value mono">{summary.podiums}</div>
+            <div className="dp-stat-label">Podiums</div>
+          </div>
+          <div className="dp-stat">
+            <div className="dp-stat-value mono">{summary.poles}</div>
+            <div className="dp-stat-label">Poles</div>
+          </div>
+        </div>
+        <Link to="/championship" className="dp-back mono">
+          ← Championship
+        </Link>
+      </header>
+
+      <section className="dp-section" data-testid="dp-form">
+        <h2 className="dp-section-title mono">Season form</h2>
+        {summary.cumulative.length > 0 ? (
+          <div className="dp-form-grid">
+            <CumulativeLine
+              cumulative={summary.cumulative}
+              labels={summary.round_labels}
+              color={color}
+            />
+            <FormStrip form={summary.form} color={color} />
+          </div>
+        ) : (
+          <div className="dp-empty">No completed rounds yet.</div>
+        )}
+      </section>
+
+      <section className="dp-section" data-testid="dp-quali-race">
+        <h2 className="dp-section-title mono">Quali vs race</h2>
+        {deltas.some((d) => d.delta != null) ? (
+          <GridVsRaceChart deltas={deltas} color={color} />
+        ) : (
+          <div className="dp-empty">No grid-vs-finish data yet.</div>
+        )}
+      </section>
+
+      <section className="dp-section" data-testid="dp-rounds">
+        <h2 className="dp-section-title mono">Track by track</h2>
+        {summary.rounds.length > 0 ? (
+          <RoundsTable summary={summary} deltas={deltas} />
+        ) : (
+          <div className="dp-empty">No completed rounds yet.</div>
+        )}
+      </section>
+    </div>
+  )
+}
+
+const LINE_W = 640
+const LINE_H = 180
+const LINE_PL = 44
+const LINE_PR = 16
+const LINE_PT = 12
+const LINE_PB = 24
+
+function CumulativeLine({
+  cumulative,
+  labels,
+  color,
+}: {
+  cumulative: number[]
+  labels: string[]
+  color: string
+}) {
+  const n = cumulative.length
+  const maxY = Math.max(25, ...cumulative)
+  const plotW = LINE_W - LINE_PL - LINE_PR
+  const plotH = LINE_H - LINE_PT - LINE_PB
+  const x = (i: number) => (n <= 1 ? LINE_PL + plotW / 2 : LINE_PL + (i * plotW) / (n - 1))
+  const y = (v: number) => LINE_PT + plotH - (v / maxY) * plotH
+  const points = cumulative.map((v, i) => `${x(i).toFixed(1)},${y(v).toFixed(1)}`).join(' ')
+
+  const tickStep = Math.max(1, Math.ceil(n / 8))
+  const ticks: { x: number; label: string }[] = []
+  for (let i = 0; i < n; i += tickStep) {
+    ticks.push({ x: x(i), label: labels[i] ?? `R${i + 1}` })
+  }
+
+  return (
+    <figure className="dp-chart">
+      <figcaption className="dp-chart-caption mono">Cumulative points</figcaption>
+      <svg viewBox={`0 0 ${LINE_W} ${LINE_H}`} className="dp-chart-svg" role="img" aria-label="Cumulative points per round">
+        {[0, 0.5, 1].map((f) => {
+          const v = Math.round(maxY * f)
+          return (
+            <g key={f}>
+              <line x1={LINE_PL} y1={y(v)} x2={LINE_W - LINE_PR} y2={y(v)} className="dp-gridline" />
+              <text x={LINE_PL - 6} y={y(v) + 3} textAnchor="end" className="dp-axis">
+                {v}
+              </text>
+            </g>
+          )
+        })}
+        {ticks.map((t) => (
+          <text key={t.label} x={t.x} y={LINE_H - 8} textAnchor="middle" className="dp-axis">
+            {t.label}
+          </text>
+        ))}
+        <polyline
+          points={points}
+          fill="none"
+          stroke={color}
+          strokeWidth="2.2"
+          strokeLinejoin="round"
+          strokeLinecap="round"
+        />
+        <circle cx={x(n - 1)} cy={y(cumulative[n - 1])} r="3.2" fill={color} />
+      </svg>
+    </figure>
+  )
+}
+
+function FormStrip({ form, color }: { form: number[]; color: string }) {
+  const max = Math.max(25, ...form)
+  return (
+    <div className="dp-form-strip">
+      <div className="dp-chart-caption mono">Last {form.length} races</div>
+      <div className="dp-form-bars">
+        {form.map((pts, i) => (
+          <div className="dp-form-bar" key={i} title={`${fmtPts(pts)} pts`}>
+            <div
+              className="dp-form-bar-fill"
+              style={{ height: `${Math.max(4, (pts / max) * 100)}%`, background: color }}
+            />
+            <span className="dp-form-bar-val mono">{fmtPts(pts)}</span>
+          </div>
+        ))}
+      </div>
+    </div>
+  )
+}
+
+const DELTA_H = 190
+const DELTA_PT = 14
+const DELTA_PB = 30
+
+function GridVsRaceChart({ deltas, color }: { deltas: RoundDelta[]; color: string }) {
+  const maxAbs = Math.max(1, ...deltas.map((d) => Math.abs(d.delta ?? 0)))
+  const colW = 34
+  const w = Math.max(240, deltas.length * colW)
+  const plotH = DELTA_H - DELTA_PT - DELTA_PB
+  const zeroY = DELTA_PT + plotH / 2
+  const scale = plotH / 2 / maxAbs
+
+  return (
+    <figure className="dp-chart">
+      <figcaption className="dp-chart-caption mono">
+        Positions gained (▲) / lost (▼) from grid to flag, per round
+      </figcaption>
+      <div className="dp-chart-scroll">
+        <svg
+          viewBox={`0 0 ${w} ${DELTA_H}`}
+          width={w}
+          height={DELTA_H}
+          className="dp-delta-svg"
+          role="img"
+          aria-label="Positions gained or lost per round"
+        >
+          <line x1={0} y1={zeroY} x2={w} y2={zeroY} className="dp-zeroline" />
+          {deltas.map((d, i) => {
+            const cx = i * colW + colW / 2
+            if (d.delta == null) {
+              return (
+                <g key={d.round}>
+                  <text x={cx} y={zeroY - 6} textAnchor="middle" className="dp-axis">
+                    ·
+                  </text>
+                  <text x={cx} y={DELTA_H - 8} textAnchor="middle" className="dp-axis">
+                    R{d.round}
+                  </text>
+                </g>
+              )
+            }
+            const h = Math.abs(d.delta) * scale
+            const yTop = d.delta >= 0 ? zeroY - h : zeroY
+            return (
+              <g key={d.round}>
+                <title>{`${d.label}: ${formatPosition(d.grid)} → ${formatPosition(d.finish)} (${formatDelta(d.delta)})`}</title>
+                <rect
+                  x={cx - 8}
+                  y={yTop}
+                  width={16}
+                  height={Math.max(1.5, h)}
+                  rx={2}
+                  fill={color}
+                  opacity={d.delta >= 0 ? 0.95 : 0.45}
+                />
+                <text
+                  x={cx}
+                  y={d.delta >= 0 ? yTop - 4 : yTop + h + 11}
+                  textAnchor="middle"
+                  className="dp-delta-val mono"
+                >
+                  {formatDelta(d.delta)}
+                </text>
+                <text x={cx} y={DELTA_H - 8} textAnchor="middle" className="dp-axis">
+                  R{d.round}
+                </text>
+              </g>
+            )
+          })}
+        </svg>
+      </div>
+    </figure>
+  )
+}
+
+function statusNote(d: RoundDelta): string {
+  if (d.status === 'dnf') return 'DNF'
+  if (d.status === 'dns') return 'DNS'
+  if (d.status === 'dsq') return 'DSQ'
+  if (d.status === 'absent') return '—'
+  return ''
+}
+
+function RoundsTable({ summary, deltas }: { summary: DriverSummary; deltas: RoundDelta[] }) {
+  return (
+    <div className="dp-scroll">
+      <table className="dp-table">
+        <thead>
+          <tr>
+            <th className="l">Rnd</th>
+            <th className="l">Grand Prix</th>
+            <th className="r">Grid</th>
+            <th className="r">Race</th>
+            <th className="r">Δ</th>
+            <th className="r">Pts</th>
+            <th className="l"></th>
+          </tr>
+        </thead>
+        <tbody>
+          {summary.rounds.map((r, i) => {
+            const d = deltas[i]
+            return (
+              <tr key={r.meeting_key}>
+                <td className="mono dp-td-dim">R{i + 1}</td>
+                <td>
+                  <span className="dp-flag" aria-hidden="true">
+                    {countryFlag({ country_code: r.country_code, country_flag: '' })}
+                  </span>
+                  {r.meeting_name}
+                </td>
+                <td className="r mono">{formatPosition(d.grid)}</td>
+                <td className="r mono">{formatPosition(d.finish)}</td>
+                <td
+                  className="r mono"
+                  style={{
+                    color:
+                      d.delta == null
+                        ? 'var(--text-3)'
+                        : d.delta > 0
+                          ? 'var(--green)'
+                          : d.delta < 0
+                            ? 'var(--red)'
+                            : 'var(--text-2)',
+                  }}
+                >
+                  {formatDelta(d.delta)}
+                </td>
+                <td className="r mono">{fmtPts(r.points)}</td>
+                <td className="dp-td-dim mono">{statusNote(d)}</td>
+              </tr>
+            )
+          })}
+        </tbody>
+      </table>
+    </div>
+  )
+}