feat(05-03): Exercise research frontend integration

- Add ExerciseResearchPanel component with Get Research button, loading state, summary display, and source links
- Add ExerciseEncyclopediaPage with exercise list and integrated research panel
- Wire encyclopedia view into App.jsx navigation
- Add encyclopedia nav button to Dashboard
- Add CSS for research panel and encyclopedia search

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/App.jsx

@@ -6,6 +6,7 @@ import ProgressPage from './pages/ProgressPage'
 import WorkoutPage from './pages/WorkoutPage'
 import WorkoutSelectPage from './pages/WorkoutSelectPage'
 import ChatOnboarding from './pages/ChatOnboarding'
+import ExerciseEncyclopediaPage from './pages/ExerciseEncyclopediaPage'
 import './App.css'
 
 const API_URL = '/api'
@@ -144,6 +145,11 @@ function App() {
     return <ProgressPage onBack={() => setView('dashboard')} />
   }
 
+  // Exercise encyclopedia
+  if (view === 'encyclopedia') {
+    return <ExerciseEncyclopediaPage onBack={() => setView('dashboard')} />
+  }
+
   // Workout select page
   if (view === 'select-workout') {
     return (

frontend/src/components/ExerciseResearchPanel.jsx

@@ -0,0 +1,107 @@
+import { useState } from 'react'
+
+const API_URL = '/api'
+
+function ExerciseResearchPanel({ exerciseId, exerciseName }) {
+  const [loading, setLoading] = useState(false)
+  const [research, setResearch] = useState(null)
+  const [error, setError] = useState(null)
+
+  const fetchResearch = async () => {
+    setLoading(true)
+    setError(null)
+    try {
+      const res = await fetch(`${API_URL}/exercises/${exerciseId}/research`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({})
+      })
+      if (!res.ok) {
+        const data = await res.json()
+        throw new Error(data.error || 'Failed to fetch research')
+      }
+      const data = await res.json()
+      setResearch(data)
+    } catch (err) {
+      setError(err.message)
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  return (
+    <div className="research-panel">
+      <div className="research-panel-header">
+        <h3 className="research-panel-title">Research</h3>
+        {!research && (
+          <button
+            className="btn btn-primary research-btn"
+            onClick={fetchResearch}
+            disabled={loading}
+          >
+            {loading ? 'Fetching...' : 'Get Research'}
+          </button>
+        )}
+        {research && (
+          <button
+            className="btn btn-secondary research-btn"
+            onClick={fetchResearch}
+            disabled={loading}
+          >
+            {loading ? 'Fetching...' : 'Refresh'}
+          </button>
+        )}
+      </div>
+
+      {loading && (
+        <div className="research-loading">
+          <div className="research-spinner"></div>
+          <span>Searching for information on {exerciseName}...</span>
+        </div>
+      )}
+
+      {error && (
+        <div className="research-error">
+          <span>{error}</span>
+          <button className="btn-close" onClick={() => setError(null)}>×</button>
+        </div>
+      )}
+
+      {research && !loading && (
+        <div className="research-results">
+          {research.summary && (
+            <div className="research-summary">
+              <h4>Summary</h4>
+              <p>{research.summary}</p>
+            </div>
+          )}
+
+          {research.results && research.results.length > 0 && (
+            <div className="research-sources">
+              <h4>Sources</h4>
+              <ul className="research-sources-list">
+                {research.results.map((result, i) => (
+                  <li key={i} className="research-source-item">
+                    <a
+                      href={result.url}
+                      target="_blank"
+                      rel="noopener noreferrer"
+                      className="research-source-link"
+                    >
+                      {result.title}
+                    </a>
+                    {result.snippet && (
+                      <p className="research-source-snippet">{result.snippet}</p>
+                    )}
+                  </li>
+                ))}
+              </ul>
+            </div>
+          )}
+        </div>
+      )}
+    </div>
+  )
+}
+
+export default ExerciseResearchPanel

frontend/src/pages/Dashboard.jsx

@@ -98,6 +98,7 @@ function Dashboard({ onStartWorkout, onNavigate }) {
           <nav className="nav-menu">
             <button className="nav-btn active"><Icon name="home" size={18} /></button>
             <button className="nav-btn" onClick={() => onNavigate('progress')}><Icon name="chart" size={18} /></button>
+            <button className="nav-btn" onClick={() => onNavigate('encyclopedia')} title="Exercise Encyclopedia"><Icon name="search" size={18} /></button>
             <button className="nav-btn" onClick={() => onNavigate('profile')}><Icon name="user" size={18} /></button>
             <button className="nav-btn logout" onClick={logout}><Icon name="logout" size={18} /></button>
           </nav>

frontend/src/pages/ExerciseEncyclopediaPage.jsx

@@ -0,0 +1,128 @@
+import { useState, useEffect } from 'react'
+import ExerciseResearchPanel from '../components/ExerciseResearchPanel'
+import './WorkoutEditPage.css'
+
+const API_URL = '/api'
+
+function ExerciseEncyclopediaPage({ onBack }) {
+  const [exercises, setExercises] = useState([])
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState(null)
+  const [search, setSearch] = useState('')
+  const [selected, setSelected] = useState(null)
+
+  useEffect(() => {
+    const fetchExercises = async () => {
+      try {
+        const res = await fetch(`${API_URL}/exercises?limit=100`)
+        if (!res.ok) throw new Error('Failed to load exercises')
+        const data = await res.json()
+        setExercises(data)
+      } catch (err) {
+        setError(err.message)
+      } finally {
+        setLoading(false)
+      }
+    }
+    fetchExercises()
+  }, [])
+
+  const filtered = exercises.filter(ex =>
+    ex.name.toLowerCase().includes(search.toLowerCase())
+  )
+
+  return (
+    <div className="edit-page">
+      <div className="page-header">
+        <button className="back-btn" onClick={onBack}>
+          ← Back
+        </button>
+        <h1>Exercise Encyclopedia</h1>
+        <div style={{ width: 70 }} />
+      </div>
+
+      <div className="edit-main">
+        <div className="workout-meta-card">
+          <input
+            type="text"
+            placeholder="Search exercises..."
+            value={search}
+            onChange={e => setSearch(e.target.value)}
+            className="encyclopedia-search"
+          />
+        </div>
+
+        {loading && (
+          <div className="workout-meta-card">
+            <p>Loading exercises...</p>
+          </div>
+        )}
+
+        {error && (
+          <div className="error-banner">
+            <span>{error}</span>
+          </div>
+        )}
+
+        {!loading && !error && (
+          <div className="edit-exercises-list">
+            {filtered.length === 0 && (
+              <div className="workout-meta-card">
+                <p>No exercises found.</p>
+              </div>
+            )}
+            {filtered.map(exercise => (
+              <div
+                key={exercise.id}
+                className={`edit-exercise-card${selected?.id === exercise.id ? ' exercise-selected' : ''}`}
+              >
+                <div
+                  className="edit-card-header"
+                  onClick={() => setSelected(selected?.id === exercise.id ? null : exercise)}
+                  style={{ cursor: 'pointer' }}
+                >
+                  <div className="edit-card-info">
+                    <h3>{exercise.name}</h3>
+                    <div style={{ display: 'flex', gap: '0.5rem', flexWrap: 'wrap' }}>
+                      {exercise.difficulty && (
+                        <span className="muscle-group">{exercise.difficulty}</span>
+                      )}
+                      {(exercise.muscle_groups || []).map(mg => (
+                        <span key={mg} className="muscle-group">{mg}</span>
+                      ))}
+                    </div>
+                    {exercise.description && (
+                      <p style={{ margin: '0.5rem 0 0', fontSize: '0.875rem', color: '#666' }}>
+                        {exercise.description}
+                      </p>
+                    )}
+                  </div>
+                  <span style={{ color: '#999', fontSize: '1.25rem' }}>
+                    {selected?.id === exercise.id ? '▲' : '▼'}
+                  </span>
+                </div>
+
+                {selected?.id === exercise.id && (
+                  <div className="exercise-detail-expanded">
+                    {exercise.instructions && (
+                      <div className="exercise-instructions">
+                        <h4>Instructions</h4>
+                        <p>{exercise.instructions}</p>
+                      </div>
+                    )}
+                    <ExerciseResearchPanel
+                      exerciseId={exercise.id}
+                      exerciseName={exercise.name}
+                    />
+                  </div>
+                )}
+              </div>
+            ))}
+          </div>
+        )}
+      </div>
+    </div>
+  )
+}
+
+export default ExerciseEncyclopediaPage

frontend/src/pages/WorkoutEditPage.css

@@ -484,3 +484,169 @@
     justify-content: space-between;
   }
 }
+
+/* Encyclopedia search input */
+.encyclopedia-search {
+  width: 100%;
+  padding: 0.625rem 0.75rem;
+  border: 1px solid #ddd;
+  border-radius: 0.25rem;
+  font-size: 1rem;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+  min-height: 44px;
+  box-sizing: border-box;
+}
+
+.encyclopedia-search:focus {
+  outline: none;
+  border-color: #007bff;
+  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
+}
+
+/* Selected exercise highlight */
+.edit-exercise-card.exercise-selected {
+  border: 2px solid #007bff;
+}
+
+/* Expanded exercise detail */
+.exercise-detail-expanded {
+  border-top: 1px solid #eee;
+  padding-top: 1rem;
+  margin-top: 0.5rem;
+  display: flex;
+  flex-direction: column;
+  gap: 1rem;
+}
+
+.exercise-instructions h4 {
+  margin: 0 0 0.5rem;
+  font-size: 0.9rem;
+  color: #555;
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+}
+
+.exercise-instructions p {
+  margin: 0;
+  font-size: 0.9rem;
+  color: #444;
+  line-height: 1.6;
+}
+
+/* Research panel */
+.research-panel {
+  background: #f8f9fa;
+  border-radius: 0.375rem;
+  padding: 1rem;
+  display: flex;
+  flex-direction: column;
+  gap: 0.75rem;
+}
+
+.research-panel-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+
+.research-panel-title {
+  margin: 0;
+  font-size: 0.9rem;
+  color: #555;
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+}
+
+.research-btn {
+  padding: 0.4rem 0.9rem;
+  font-size: 0.875rem;
+  min-height: 36px;
+}
+
+.research-loading {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem;
+  color: #666;
+  font-size: 0.9rem;
+  padding: 0.5rem 0;
+}
+
+.research-spinner {
+  width: 18px;
+  height: 18px;
+  border: 2px solid #ddd;
+  border-top-color: #007bff;
+  border-radius: 50%;
+  animation: spin 0.8s linear infinite;
+  flex-shrink: 0;
+}
+
+.research-error {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  background: #f8d7da;
+  color: #721c24;
+  padding: 0.5rem 0.75rem;
+  border-radius: 0.25rem;
+  font-size: 0.875rem;
+}
+
+.research-results {
+  display: flex;
+  flex-direction: column;
+  gap: 0.75rem;
+}
+
+.research-summary h4,
+.research-sources h4 {
+  margin: 0 0 0.5rem;
+  font-size: 0.85rem;
+  color: #555;
+  font-weight: 600;
+}
+
+.research-summary p {
+  margin: 0;
+  font-size: 0.9rem;
+  color: #333;
+  line-height: 1.6;
+}
+
+.research-sources-list {
+  list-style: none;
+  margin: 0;
+  padding: 0;
+  display: flex;
+  flex-direction: column;
+  gap: 0.625rem;
+}
+
+.research-source-item {
+  background: white;
+  border: 1px solid #e0e0e0;
+  border-radius: 0.25rem;
+  padding: 0.625rem 0.75rem;
+}
+
+.research-source-link {
+  color: #007bff;
+  font-size: 0.9rem;
+  font-weight: 500;
+  text-decoration: none;
+  display: block;
+  margin-bottom: 0.25rem;
+  word-break: break-word;
+}
+
+.research-source-link:hover {
+  text-decoration: underline;
+}
+
+.research-source-snippet {
+  margin: 0;
+  font-size: 0.825rem;
+  color: #555;
+  line-height: 1.5;
+}