feat(ui): MISSIONS tab renders the live mission board

Self-fetching MissionPanel (world-map pattern — refetches on each tab open,
accept responses applied directly). One card per contract: type title + state
badge, CONTRACT // #id line, objective, reward line, EXPLORE progress line.
ACCEPT enabled only when AVAILABLE and nothing else is ACTIVE. Placeholder
encounter content removed.

components/mission-control.tsx

@@ -2,7 +2,6 @@
 
 import { useEffect, useState } from 'react'
 import { Badge } from '@/components/ui/badge'
-import { Alert, AlertDescription, AlertTitle } from '@/components/ui/alert'
 import { Panel, PanelContent, PanelHeader, PanelTitle } from '@/components/ui/panel'
 import { Progress } from '@/components/ui/progress'
 import { StatCard } from '@/components/ui/stat-card'
@@ -11,6 +10,7 @@ import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs'
 import { Terminal, type TerminalLine } from '@/components/ui/terminal'
 import { CrewPanel } from '@/components/crew-panel'
 import { LocalSystemPanel } from '@/components/local-system'
+import { MissionPanel } from '@/components/missions'
 import { ShipSystemsPanel } from '@/components/ship-systems'
 import { SkillTreePanel } from '@/components/skill-tree'
 import { WorldMapPanel } from '@/components/world-map'
@@ -21,9 +21,9 @@ import type { TechDto } from '@/lib/game/tech'
 
 // Interface base: layout + visual treatment rebuilt from the scificn-ui Mission Control
 // showcase (src/app/_pages/showcase/mission-control-content.tsx in baxy5/scificn-ui). The
-// WORLD MAP, LOCAL SYSTEM, CREW, SHIP SYSTEMS and SKILL TREE tabs render live data (/api/world,
-// /api/system, /api/crew, /api/ship, /api/tech); the other tabs keep placeholder content until
-// their own issues land. Single player, no auth, by design.
+// WORLD MAP, LOCAL SYSTEM, CREW, SHIP SYSTEMS, SKILL TREE and MISSIONS tabs render live data
+// (/api/world, /api/system, /api/crew, /api/ship, /api/tech, /api/missions); the EVENT LOG tab
+// keeps placeholder content until its own issue lands. Single player, no auth, by design.
 
 function useNarrow(threshold = 900): boolean {
   const [narrow, setNarrow] = useState(
@@ -386,62 +386,9 @@ export function MissionControl() {
                     <SkillTreePanel techs={techs} ship={ship} narrow={narrow} onResearched={setTechs} />
                   </TabsContent>
 
-                  {/* MISSIONS TAB */}
+                  {/* MISSIONS TAB — live data from /api/missions */}
                   <TabsContent value="missions" style={{ margin: 0, padding: '1rem' }}>
-                    <div
-                      style={{ display: 'flex', flexDirection: 'column', gap: '0.75rem' }}
-                    >
-                      <Alert variant="STATUS">
-                        <AlertTitle>ENCOUNTER #E-102 — DERELICT FREIGHTER</AlertTitle>
-                        <AlertDescription>
-                          Placeholder briefing. Real encounter resolution lands with the turn engine.
-                        </AlertDescription>
-                      </Alert>
-
-                      <div
-                        style={{
-                          display: 'grid',
-                          gridTemplateColumns: narrow ? '1fr' : '1fr 1fr',
-                          gap: '0.625rem',
-                        }}
-                      >
-                        {[
-                          { label: 'DESTINATION', value: 'SECTOR 7G // DRIFT LANE' },
-                          { label: 'ETA', value: 'T-07:14 (PLACEHOLDER)' },
-                          { label: 'THREAT LEVEL', value: 'LOW — UNMANNED' },
-                          { label: 'CARGO MANIFEST', value: 'UNKNOWN' },
-                        ].map((item) => (
-                          <div
-                            key={item.label}
-                            style={{
-                              padding: '0.75rem',
-                              background: 'var(--surface)',
-                              border: '1px solid var(--border)',
-                            }}
-                          >
-                            <div
-                              style={{
-                                fontSize: '0.55rem',
-                                color: 'var(--text-muted)',
-                                letterSpacing: '0.12em',
-                                marginBottom: '0.35rem',
-                              }}
-                            >
-                              {item.label}
-                            </div>
-                            <div
-                              style={{
-                                fontSize: '0.8rem',
-                                color: 'var(--text-secondary)',
-                                letterSpacing: '0.04em',
-                              }}
-                            >
-                              {item.value}
-                            </div>
-                          </div>
-                        ))}
-                      </div>
-                    </div>
+                    <MissionPanel />
                   </TabsContent>
 
                   {/* EVENT LOG TAB */}

components/missions.tsx

@@ -0,0 +1,120 @@
+'use client'
+
+import { useCallback, useEffect, useState } from 'react'
+import { Badge } from '@/components/ui/badge'
+import { Button } from '@/components/ui/button'
+import { Card, CardContent, CardFooter, CardHeader, CardTitle } from '@/components/ui/card'
+import type { MissionDto } from '@/lib/game/missions'
+
+// MISSIONS tab — live data. Fetches /api/missions on mount (Radix Tabs unmounts inactive tabs, so it
+// refetches whenever the tab is opened); accept responses are applied directly (no polling). ACCEPT is
+// enabled only when the contract is AVAILABLE and no other mission is ACTIVE — mirroring what
+// POST /api/missions/{id}/accept enforces.
+
+export function MissionPanel() {
+  const [missions, setMissions] = useState<MissionDto[] | null>(null)
+  const [error, setError] = useState<string | null>(null)
+  const [busyId, setBusyId] = useState<number | null>(null) // one action at a time — turn-based game
+
+  useEffect(() => {
+    let cancelled = false
+    fetch('/api/missions')
+      .then(async (res) => {
+        if (!res.ok) throw new Error(`HTTP ${res.status}`)
+        return (await res.json()) as MissionDto[]
+      })
+      .then((m) => {
+        if (!cancelled) setMissions(m)
+      })
+      .catch((err: unknown) => {
+        if (!cancelled) setError(err instanceof Error ? err.message : String(err))
+      })
+    return () => {
+      cancelled = true
+    }
+  }, [])
+
+  const accept = useCallback(async (mission: MissionDto) => {
+    setBusyId(mission.id)
+    setError(null)
+    try {
+      const res = await fetch(`/api/missions/${mission.id}/accept`, { method: 'POST' })
+      const data = (await res.json()) as MissionDto[] & { error?: string }
+      if (!res.ok) throw new Error(data.error ?? `HTTP ${res.status}`)
+      setMissions(data) // response is the fresh board — apply directly
+    } catch (err: unknown) {
+      setError(err instanceof Error ? err.message : String(err))
+    } finally {
+      setBusyId(null)
+    }
+  }, [])
+
+  if (!missions && !error) {
+    return (
+      <div style={{ border: '1px solid var(--border)', background: 'var(--surface)', padding: '0.75rem' }}>
+        <span style={{ fontSize: '0.62rem', color: 'var(--text-muted)', letterSpacing: '0.12em' }}>LOADING MISSIONS…</span>
+      </div>
+    )
+  }
+
+  const active = (missions ?? []).find((m) => m.state === 'ACTIVE')
+
+  return (
+    <div style={{ display: 'flex', flexDirection: 'column', gap: '0.75rem' }}>
+      {error && (
+        <div style={{ border: '1px solid var(--border)', background: 'var(--surface)', padding: '0.75rem' }}>
+          <span style={{ fontSize: '0.62rem', color: 'var(--color-red)', letterSpacing: '0.08em' }}>{error.toUpperCase()}</span>
+        </div>
+      )}
+      <div style={{ display: 'grid', gridTemplateColumns: 'repeat(3, 1fr)', gap: '0.75rem' }}>
+        {(missions ?? []).map((mission) => (
+          <MissionCard key={mission.id} mission={mission} busy={busyId === mission.id} blockedByActive={!!active && active.id !== mission.id} onAccept={accept} />
+        ))}
+      </div>
+    </div>
+  )
+}
+
+function MissionCard({
+  mission,
+  busy,
+  blockedByActive,
+  onAccept,
+}: {
+  mission: MissionDto
+  busy: boolean
+  blockedByActive: boolean
+  onAccept: (mission: MissionDto) => void
+}) {
+  const acceptDisabled = busy || mission.state !== 'AVAILABLE' || blockedByActive
+
+  return (
+    <Card>
+      <CardHeader>
+        <div style={{ display: 'flex', alignItems: 'center' }}>
+          <CardTitle>{mission.type}</CardTitle>
+          <Badge variant={mission.state === 'ACTIVE' ? 'ACTIVE' : mission.state === 'AVAILABLE' ? 'SCANNING' : 'OFFLINE'} className="ml-auto">
+            {mission.state}
+          </Badge>
+        </div>
+      </CardHeader>
+      <CardContent>
+        <p style={{ fontSize: '0.62rem', color: 'var(--text-muted)', letterSpacing: '0.08em' }}>CONTRACT // #{mission.id}</p>
+        <p style={{ fontSize: '0.65rem', color: 'var(--text-secondary)', letterSpacing: '0.08em' }}>{mission.description.toUpperCase()}</p>
+        <p style={{ fontSize: '0.62rem', color: 'var(--color-green)', letterSpacing: '0.08em' }}>
+          REWARD {mission.rewardQty}× {mission.rewardKind === 'resource' ? 'RESOURCES' : 'PARTS'}
+        </p>
+        {mission.type === 'EXPLORE' && (
+          <p style={{ fontSize: '0.62rem', color: 'var(--text-muted)', letterSpacing: '0.08em' }}>
+            PROGRESS // {mission.progress}/{mission.progressTarget}
+          </p>
+        )}
+      </CardContent>
+      <CardFooter>
+        <Button variant="OUTLINE" size="SM" disabled={acceptDisabled} onClick={() => onAccept(mission)}>
+          ACCEPT
+        </Button>
+      </CardFooter>
+    </Card>
+  )
+}