feat: Add project file tree viewer to Git page

Add Files tab with browsable project structure and file content viewer.
New components: ProjectTree for navigation, FileViewer for content display.
Backend endpoints: /api/git/tree and /api/git/file.

frontend/src/components/git/FileViewer.vue

@@ -0,0 +1,308 @@
+<script setup lang="ts">
+import { computed } from 'vue'
+import type { FileContent } from '@/types/git'
+
+const props = defineProps<{
+  file: FileContent | null
+  loading?: boolean
+}>()
+
+const emit = defineEmits<{
+  close: []
+}>()
+
+// Get language for syntax highlighting hint
+const language = computed(() => {
+  if (!props.file?.extension) return 'text'
+  const langMap: Record<string, string> = {
+    ts: 'typescript',
+    tsx: 'typescript',
+    js: 'javascript',
+    jsx: 'javascript',
+    vue: 'vue',
+    json: 'json',
+    md: 'markdown',
+    css: 'css',
+    scss: 'scss',
+    html: 'html',
+    svg: 'xml',
+    yml: 'yaml',
+    yaml: 'yaml',
+    toml: 'toml',
+    sh: 'bash',
+    bash: 'bash',
+    py: 'python',
+    rs: 'rust',
+    go: 'go',
+    sql: 'sql'
+  }
+  return langMap[props.file.extension] || 'text'
+})
+
+const lines = computed(() => {
+  if (!props.file?.content) return []
+  return props.file.content.split('\n')
+})
+
+const fileName = computed(() => {
+  if (!props.file?.path) return ''
+  return props.file.path.split('/').pop() || props.file.path
+})
+
+function formatSize(bytes: number): string {
+  if (bytes < 1024) return `${bytes} B`
+  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`
+  return `${(bytes / (1024 * 1024)).toFixed(1)} MB`
+}
+</script>
+
+<template>
+  <div class="file-viewer">
+    <div v-if="loading" class="loading-state">
+      <div class="spinner"></div>
+      Cargando archivo...
+    </div>
+
+    <template v-else-if="file">
+      <div class="file-header">
+        <div class="file-info">
+          <span class="file-name">{{ fileName }}</span>
+          <span class="file-path">{{ file.path }}</span>
+          <span class="file-size">{{ formatSize(file.size) }}</span>
+        </div>
+        <button class="close-btn" @click="emit('close')" title="Cerrar">
+          <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+            <line x1="18" y1="6" x2="6" y2="18" />
+            <line x1="6" y1="6" x2="18" y2="18" />
+          </svg>
+        </button>
+      </div>
+
+      <div v-if="file.isBinary" class="binary-notice">
+        <svg width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+          <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z" />
+          <polyline points="14 2 14 8 20 8" />
+        </svg>
+        <p>Archivo binario - no se puede mostrar el contenido</p>
+        <span>{{ formatSize(file.size) }}</span>
+      </div>
+
+      <div v-else class="code-container">
+        <div class="line-numbers">
+          <span v-for="(_, i) in lines" :key="i" class="line-number">{{ i + 1 }}</span>
+        </div>
+        <pre class="code-content"><code>{{ file.content }}</code></pre>
+      </div>
+    </template>
+
+    <div v-else class="empty-state">
+      <svg width="48" height="48" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5">
+        <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z" />
+        <polyline points="14 2 14 8 20 8" />
+      </svg>
+      <p>Selecciona un archivo para ver su contenido</p>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.file-viewer {
+  display: flex;
+  flex-direction: column;
+  height: 100%;
+  background: var(--bg-primary);
+  border: 1px solid var(--border-color);
+  border-radius: 8px;
+  overflow: hidden;
+}
+
+.loading-state,
+.empty-state {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 0.75rem;
+  flex: 1;
+  padding: 2rem;
+  color: var(--text-muted);
+  text-align: center;
+}
+
+.empty-state svg {
+  opacity: 0.5;
+}
+
+.empty-state p {
+  font-size: 14px;
+  color: var(--text-secondary);
+  margin: 0;
+}
+
+.spinner {
+  width: 24px;
+  height: 24px;
+  border: 2px solid var(--border-color);
+  border-top-color: var(--accent);
+  border-radius: 50%;
+  animation: spin 0.8s linear infinite;
+}
+
+@keyframes spin {
+  to { transform: rotate(360deg); }
+}
+
+.file-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 0.75rem 1rem;
+  background: var(--bg-secondary);
+  border-bottom: 1px solid var(--border-color);
+}
+
+.file-info {
+  display: flex;
+  align-items: center;
+  gap: 1rem;
+  min-width: 0;
+}
+
+.file-name {
+  font-weight: 600;
+  font-size: 13px;
+  color: var(--text-primary);
+}
+
+.file-path {
+  font-size: 12px;
+  color: var(--text-muted);
+  font-family: 'SF Mono', 'Fira Code', monospace;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.file-size {
+  font-size: 11px;
+  color: var(--text-muted);
+  padding: 0.15rem 0.4rem;
+  background: var(--bg-hover);
+  border-radius: 4px;
+  flex-shrink: 0;
+}
+
+.close-btn {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 28px;
+  height: 28px;
+  background: transparent;
+  border: none;
+  border-radius: 4px;
+  color: var(--text-muted);
+  cursor: pointer;
+  transition: all 0.15s;
+}
+
+.close-btn:hover {
+  background: var(--bg-hover);
+  color: var(--text-primary);
+}
+
+.binary-notice {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 0.75rem;
+  flex: 1;
+  padding: 2rem;
+  color: var(--text-muted);
+  text-align: center;
+}
+
+.binary-notice p {
+  font-size: 14px;
+  color: var(--text-secondary);
+  margin: 0;
+}
+
+.binary-notice span {
+  font-size: 12px;
+}
+
+.code-container {
+  display: flex;
+  flex: 1;
+  overflow: auto;
+  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
+  font-size: 13px;
+  line-height: 1.6;
+}
+
+.line-numbers {
+  display: flex;
+  flex-direction: column;
+  padding: 0.75rem 0;
+  background: var(--bg-secondary);
+  border-right: 1px solid var(--border-color);
+  text-align: right;
+  user-select: none;
+  flex-shrink: 0;
+}
+
+.line-number {
+  padding: 0 0.75rem;
+  color: var(--text-muted);
+  font-size: 12px;
+  min-width: 3ch;
+}
+
+.code-content {
+  flex: 1;
+  margin: 0;
+  padding: 0.75rem 1rem;
+  overflow-x: auto;
+  white-space: pre;
+  color: var(--text-primary);
+}
+
+.code-content code {
+  font-family: inherit;
+}
+
+/* Mobile */
+@media (max-width: 768px) {
+  .file-header {
+    padding: 0.5rem 0.75rem;
+  }
+
+  .file-info {
+    gap: 0.5rem;
+  }
+
+  .file-name {
+    font-size: 12px;
+  }
+
+  .file-path {
+    display: none;
+  }
+
+  .code-container {
+    font-size: 11px;
+    line-height: 1.5;
+  }
+
+  .line-number {
+    font-size: 10px;
+    padding: 0 0.5rem;
+  }
+
+  .code-content {
+    padding: 0.5rem;
+  }
+}
+</style>

frontend/src/components/git/ProjectTree.vue

@@ -0,0 +1,290 @@
+<script setup lang="ts">
+import { ref, computed } from 'vue'
+import type { TreeNode } from '@/types/git'
+
+const props = defineProps<{
+  nodes: TreeNode[]
+  selectedPath?: string | null
+  loading?: boolean
+}>()
+
+const emit = defineEmits<{
+  select: [path: string]
+}>()
+
+const expandedDirs = ref<Set<string>>(new Set())
+
+function toggleDir(path: string) {
+  if (expandedDirs.value.has(path)) {
+    expandedDirs.value.delete(path)
+  } else {
+    expandedDirs.value.add(path)
+  }
+  expandedDirs.value = new Set(expandedDirs.value)
+}
+
+function isExpanded(path: string): boolean {
+  return expandedDirs.value.has(path)
+}
+
+function handleSelect(node: TreeNode) {
+  if (node.type === 'directory') {
+    toggleDir(node.path)
+  } else {
+    emit('select', node.path)
+  }
+}
+
+function getFileIcon(name: string): string {
+  const ext = name.split('.').pop()?.toLowerCase() || ''
+  const icons: Record<string, string> = {
+    ts: 'ts',
+    tsx: 'tsx',
+    js: 'js',
+    jsx: 'jsx',
+    vue: 'vue',
+    json: 'json',
+    md: 'md',
+    css: 'css',
+    scss: 'scss',
+    html: 'html',
+    svg: 'svg',
+    png: 'img',
+    jpg: 'img',
+    jpeg: 'img',
+    gif: 'img',
+    ico: 'img',
+    gitignore: 'git',
+    env: 'env',
+    yml: 'yml',
+    yaml: 'yml',
+    toml: 'toml',
+    lock: 'lock'
+  }
+  return icons[ext] || 'file'
+}
+</script>
+
+<template>
+  <div class="project-tree">
+    <div v-if="loading" class="loading">
+      <div class="spinner"></div>
+      Cargando archivos...
+    </div>
+    <div v-else-if="nodes.length === 0" class="empty">
+      Sin archivos
+    </div>
+    <template v-else>
+      <div
+        v-for="node in nodes"
+        :key="node.path"
+        class="tree-node"
+      >
+        <div
+          :class="['node-row', { selected: selectedPath === node.path }]"
+          @click="handleSelect(node)"
+        >
+          <!-- Directory -->
+          <template v-if="node.type === 'directory'">
+            <span class="expand-icon">
+              <svg
+                :class="{ expanded: isExpanded(node.path) }"
+                width="12"
+                height="12"
+                viewBox="0 0 24 24"
+                fill="currentColor"
+              >
+                <path d="M8 5l8 7-8 7z" />
+              </svg>
+            </span>
+            <span class="folder-icon">
+              <svg width="14" height="14" viewBox="0 0 24 24" fill="currentColor">
+                <path v-if="isExpanded(node.path)" d="M19 20H5a2 2 0 0 1-2-2V6a2 2 0 0 1 2-2h6l2 2h6a2 2 0 0 1 2 2v10a2 2 0 0 1-2 2z" />
+                <path v-else d="M3 6a2 2 0 0 1 2-2h6l2 2h6a2 2 0 0 1 2 2v10a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V6z" />
+              </svg>
+            </span>
+          </template>
+          <!-- File -->
+          <template v-else>
+            <span class="expand-icon spacer"></span>
+            <span :class="['file-icon', getFileIcon(node.name)]">
+              <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z" />
+                <polyline points="14 2 14 8 20 8" />
+              </svg>
+            </span>
+          </template>
+          <span class="node-name">{{ node.name }}</span>
+        </div>
+        <!-- Recursive children -->
+        <div v-if="node.type === 'directory' && isExpanded(node.path) && node.children" class="children">
+          <ProjectTree
+            :nodes="node.children"
+            :selected-path="selectedPath"
+            @select="emit('select', $event)"
+          />
+        </div>
+      </div>
+    </template>
+  </div>
+</template>
+
+<style scoped>
+.project-tree {
+  font-size: 13px;
+  user-select: none;
+}
+
+.loading,
+.empty {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: 0.5rem;
+  padding: 1.5rem;
+  color: var(--text-muted);
+  font-size: 12px;
+}
+
+.spinner {
+  width: 16px;
+  height: 16px;
+  border: 2px solid var(--border-color);
+  border-top-color: var(--accent);
+  border-radius: 50%;
+  animation: spin 0.8s linear infinite;
+}
+
+@keyframes spin {
+  to { transform: rotate(360deg); }
+}
+
+.tree-node {
+  /* Container for each node */
+}
+
+.node-row {
+  display: flex;
+  align-items: center;
+  gap: 0.25rem;
+  padding: 0.3rem 0.5rem;
+  cursor: pointer;
+  border-radius: 4px;
+  transition: background 0.15s;
+}
+
+.node-row:hover {
+  background: var(--bg-hover);
+}
+
+.node-row.selected {
+  background: rgba(99, 102, 241, 0.15);
+}
+
+.expand-icon {
+  width: 16px;
+  height: 16px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+  color: var(--text-muted);
+  transition: transform 0.15s;
+}
+
+.expand-icon.spacer {
+  visibility: hidden;
+}
+
+.expand-icon svg {
+  transition: transform 0.15s;
+}
+
+.expand-icon svg.expanded {
+  transform: rotate(90deg);
+}
+
+.folder-icon {
+  width: 16px;
+  height: 16px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+  color: #f59e0b;
+}
+
+.file-icon {
+  width: 16px;
+  height: 16px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+  color: var(--text-muted);
+}
+
+/* File type colors */
+.file-icon.ts,
+.file-icon.tsx {
+  color: #3178c6;
+}
+
+.file-icon.js,
+.file-icon.jsx {
+  color: #f7df1e;
+}
+
+.file-icon.vue {
+  color: #42b883;
+}
+
+.file-icon.json {
+  color: #f5a623;
+}
+
+.file-icon.md {
+  color: #519aba;
+}
+
+.file-icon.css,
+.file-icon.scss {
+  color: #563d7c;
+}
+
+.file-icon.html {
+  color: #e34c26;
+}
+
+.file-icon.svg,
+.file-icon.img {
+  color: #a855f7;
+}
+
+.file-icon.git {
+  color: #f05032;
+}
+
+.file-icon.env {
+  color: #ecd53f;
+}
+
+.file-icon.yml {
+  color: #cb171e;
+}
+
+.file-icon.lock {
+  color: #6b7280;
+}
+
+.node-name {
+  color: var(--text-primary);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.children {
+  padding-left: 1rem;
+}
+</style>

frontend/src/components/git/index.ts

@@ -2,3 +2,5 @@ export { default as DiffViewer } from './DiffViewer.vue'
 export { default as FileTree } from './FileTree.vue'
 export { default as CommitList } from './CommitList.vue'
 export { default as BranchSelector } from './BranchSelector.vue'
+export { default as ProjectTree } from './ProjectTree.vue'
+export { default as FileViewer } from './FileViewer.vue'

frontend/src/composables/git/useGitApi.ts

@@ -1,5 +1,5 @@
 import { ref } from 'vue'
-import type { GitStatus, CommitInfo, FileDiff, BranchInfo, CompareResult, DiffResult } from '@/types/git'
+import type { GitStatus, CommitInfo, FileDiff, BranchInfo, CompareResult, DiffResult, TreeNode, FileContent } from '@/types/git'
 
 const API_BASE = '/api/git'
 
@@ -11,6 +11,8 @@ export function useGitApi() {
   const diff = ref<DiffResult | null>(null)
   const compareResult = ref<CompareResult | null>(null)
   const selectedCommit = ref<CommitInfo | null>(null)
+  const fileTree = ref<TreeNode[]>([])
+  const fileContent = ref<FileContent | null>(null)
   const loading = ref(false)
   const error = ref<string | null>(null)
 
@@ -116,6 +118,42 @@ export function useGitApi() {
     compareResult.value = null
   }
 
+  async function fetchFileTree(path?: string) {
+    loading.value = true
+    error.value = null
+    try {
+      const params = new URLSearchParams()
+      if (path) params.set('path', path)
+
+      const res = await fetch(`${API_BASE}/tree?${params}`)
+      if (!res.ok) throw new Error('Failed to fetch file tree')
+      fileTree.value = await res.json()
+    } catch (e: any) {
+      error.value = e.message
+    } finally {
+      loading.value = false
+    }
+  }
+
+  async function fetchFileContent(path: string) {
+    loading.value = true
+    error.value = null
+    try {
+      const params = new URLSearchParams({ path })
+      const res = await fetch(`${API_BASE}/file?${params}`)
+      if (!res.ok) throw new Error('Failed to fetch file content')
+      fileContent.value = await res.json()
+    } catch (e: any) {
+      error.value = e.message
+    } finally {
+      loading.value = false
+    }
+  }
+
+  function clearFileContent() {
+    fileContent.value = null
+  }
+
   return {
     status,
     commits,
@@ -124,6 +162,8 @@ export function useGitApi() {
     diff,
     compareResult,
     selectedCommit,
+    fileTree,
+    fileContent,
     loading,
     error,
     fetchStatus,
@@ -133,6 +173,9 @@ export function useGitApi() {
     fetchBranches,
     compare,
     clearDiff,
-    clearCompare
+    clearCompare,
+    fetchFileTree,
+    fetchFileContent,
+    clearFileContent
   }
 }

frontend/src/pages/GitPage.vue

@@ -1,9 +1,9 @@
 <script setup lang="ts">
 import { ref, computed, onMounted, watch } from 'vue'
 import { useGitApi } from '@/composables/git'
-import { DiffViewer, FileTree, CommitList, BranchSelector } from '@/components/git'
+import { DiffViewer, FileTree, CommitList, BranchSelector, ProjectTree, FileViewer } from '@/components/git'
 
-type TabName = 'status' | 'history' | 'compare'
+type TabName = 'status' | 'history' | 'compare' | 'files'
 
 const {
   status,
@@ -13,6 +13,8 @@ const {
   diff,
   compareResult,
   selectedCommit,
+  fileTree,
+  fileContent,
   loading,
   error,
   fetchStatus,
@@ -21,7 +23,11 @@ const {
   fetchCommit,
   fetchBranches,
   compare,
-  clearCompare
+  clearDiff,
+  clearCompare,
+  fetchFileTree,
+  fetchFileContent,
+  clearFileContent
 } = useGitApi()
 
 const activeTab = ref<TabName>('status')
@@ -33,6 +39,9 @@ const expandedFiles = ref<Set<string>>(new Set())
 const compareBase = ref('')
 const compareHead = ref('')
 
+// Files tab state
+const selectedFilePath = ref<string | null>(null)
+
 // Load initial data
 onMounted(async () => {
   await Promise.all([
@@ -51,6 +60,8 @@ watch(activeTab, async (tab) => {
     await fetchDiff()
   } else if (tab === 'history') {
     await fetchLog(30)
+  } else if (tab === 'files') {
+    await fetchFileTree()
   }
 })
 
@@ -107,6 +118,18 @@ async function refresh() {
   await fetchDiff()
 }
 
+// Handle file selection in files tab
+async function handleFileTreeSelect(path: string) {
+  selectedFilePath.value = path
+  await fetchFileContent(path)
+}
+
+// Close file viewer
+function closeFileViewer() {
+  selectedFilePath.value = null
+  clearFileContent()
+}
+
 // Total changes count
 const totalChanges = computed(() => {
   if (!status.value) return 0
@@ -190,6 +213,15 @@ const totalChanges = computed(() => {
           </svg>
           Compare
         </button>
+        <button
+          :class="['tab', { active: activeTab === 'files' }]"
+          @click="activeTab = 'files'"
+        >
+          <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+            <path d="M22 19a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h5l2 3h9a2 2 0 0 1 2 2z" />
+          </svg>
+          Files
+        </button>
       </div>
 
       <!-- Tab content -->
@@ -396,6 +428,37 @@ const totalChanges = computed(() => {
             <p>Selecciona dos ramas o commits para comparar</p>
           </div>
         </div>
+
+        <!-- Files Tab -->
+        <div v-if="activeTab === 'files'" class="files-tab">
+          <div class="files-layout">
+            <div class="file-tree-panel">
+              <div class="panel-header">
+                <span>Project Files</span>
+                <button class="refresh-tree-btn" @click="fetchFileTree" :disabled="loading" title="Refresh">
+                  <svg :class="{ spinning: loading }" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                    <path d="M21 12a9 9 0 1 1-6.219-8.56" />
+                  </svg>
+                </button>
+              </div>
+              <div class="tree-container">
+                <ProjectTree
+                  :nodes="fileTree"
+                  :selected-path="selectedFilePath"
+                  :loading="loading && !fileTree.length"
+                  @select="handleFileTreeSelect"
+                />
+              </div>
+            </div>
+            <div class="file-content-panel">
+              <FileViewer
+                :file="fileContent"
+                :loading="loading && selectedFilePath !== null"
+                @close="closeFileViewer"
+              />
+            </div>
+          </div>
+        </div>
       </div>
 
       <!-- Error message -->
@@ -873,6 +936,78 @@ const totalChanges = computed(() => {
   color: #ef4444;
 }
 
+/* Files tab */
+.files-tab {
+  height: 100%;
+}
+
+.files-layout {
+  display: grid;
+  grid-template-columns: 280px 1fr;
+  gap: 1rem;
+  height: 100%;
+}
+
+.file-tree-panel {
+  display: flex;
+  flex-direction: column;
+  border: 1px solid var(--border-color);
+  border-radius: 8px;
+  background: var(--bg-secondary);
+  overflow: hidden;
+}
+
+.panel-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 0.75rem 1rem;
+  border-bottom: 1px solid var(--border-color);
+  font-size: 13px;
+  font-weight: 500;
+  color: var(--text-secondary);
+}
+
+.refresh-tree-btn {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 24px;
+  height: 24px;
+  background: transparent;
+  border: none;
+  border-radius: 4px;
+  color: var(--text-muted);
+  cursor: pointer;
+  transition: all 0.15s;
+}
+
+.refresh-tree-btn:hover {
+  background: var(--bg-hover);
+  color: var(--text-primary);
+}
+
+.refresh-tree-btn:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+.refresh-tree-btn svg.spinning {
+  animation: spin 1s linear infinite;
+}
+
+.tree-container {
+  flex: 1;
+  overflow-y: auto;
+  padding: 0.5rem;
+}
+
+.file-content-panel {
+  display: flex;
+  flex-direction: column;
+  min-height: 0;
+}
+
 /* Error message */
 .error-message {
   padding: 0.75rem 1rem;
@@ -893,6 +1028,10 @@ const totalChanges = computed(() => {
   .history-layout {
     grid-template-columns: 280px 1fr;
   }
+
+  .files-layout {
+    grid-template-columns: 240px 1fr;
+  }
 }
 
 @media (max-width: 768px) {
@@ -1071,5 +1210,31 @@ const totalChanges = computed(() => {
     padding: 0.5rem;
     font-size: 12px;
   }
+
+  .files-layout {
+    display: flex;
+    flex-direction: column;
+    gap: 0.5rem;
+    height: 100%;
+  }
+
+  .file-tree-panel {
+    max-height: 250px;
+    flex-shrink: 0;
+  }
+
+  .panel-header {
+    padding: 0.5rem 0.75rem;
+    font-size: 12px;
+  }
+
+  .tree-container {
+    padding: 0.25rem;
+  }
+
+  .file-content-panel {
+    flex: 1;
+    min-height: 0;
+  }
 }
 </style>

frontend/src/types/git.ts

@@ -68,3 +68,18 @@ export interface CompareResult {
     deletions: number
   }
 }
+
+export interface TreeNode {
+  name: string
+  path: string
+  type: 'file' | 'directory'
+  children?: TreeNode[]
+}
+
+export interface FileContent {
+  path: string
+  isBinary: boolean
+  content: string | null
+  size: number
+  extension?: string
+}

server/routes/git.ts

@@ -1,9 +1,10 @@
 import { jsonResponse, errorResponse } from '../utils/cors'
+import { WORKING_DIR } from '../config'
 
 // Execute git command and return stdout
 async function execGit(args: string[]): Promise<{ stdout: string; stderr: string; exitCode: number }> {
   const proc = Bun.spawn(['git', ...args], {
-    cwd: process.cwd(),
+    cwd: WORKING_DIR,
     stdout: 'pipe',
     stderr: 'pipe'
   })
@@ -344,3 +345,132 @@ export async function handleGitCurrentBranch() {
 
   return jsonResponse({ branch: stdout })
 }
+
+// GET /api/git/tree - Get project file tree
+export async function handleGitTree(url: URL) {
+  // Use git ls-tree for tracked files, combined with untracked
+  const { stdout: trackedOutput, exitCode } = await execGit([
+    'ls-tree', '-r', '--name-only', 'HEAD'
+  ])
+
+  if (exitCode !== 0) {
+    return errorResponse('Failed to get file tree', 400)
+  }
+
+  // Get untracked files too
+  const { stdout: untrackedOutput } = await execGit([
+    'ls-files', '--others', '--exclude-standard'
+  ])
+
+  const trackedFiles = trackedOutput.split('\n').filter(Boolean)
+  const untrackedFiles = untrackedOutput.split('\n').filter(Boolean)
+  const allFiles = [...new Set([...trackedFiles, ...untrackedFiles])].sort()
+
+  // Build tree structure
+  const tree = buildFileTree(allFiles)
+
+  return jsonResponse(tree)
+}
+
+// Build hierarchical tree from flat file paths
+function buildFileTree(files: string[]): any[] {
+  const root: any = { children: {} }
+
+  // Build nested structure
+  for (const filePath of files) {
+    const parts = filePath.split('/')
+    let current = root
+
+    for (let i = 0; i < parts.length; i++) {
+      const name = parts[i]
+      const isFile = i === parts.length - 1
+      const currentPath = parts.slice(0, i + 1).join('/')
+
+      if (!current.children[name]) {
+        current.children[name] = {
+          name,
+          path: currentPath,
+          type: isFile ? 'file' : 'directory',
+          children: isFile ? undefined : {}
+        }
+      }
+
+      current = current.children[name]
+    }
+  }
+
+  // Convert to array format recursively
+  function toArray(node: any): any[] {
+    if (!node.children) return []
+
+    const items = Object.values(node.children) as any[]
+
+    // Convert children objects to arrays
+    for (const item of items) {
+      if (item.type === 'directory' && item.children) {
+        item.children = toArray(item)
+      }
+    }
+
+    // Sort: directories first, then alphabetically
+    return items.sort((a, b) => {
+      if (a.type !== b.type) {
+        return a.type === 'directory' ? -1 : 1
+      }
+      return a.name.localeCompare(b.name)
+    })
+  }
+
+  return toArray(root)
+}
+
+// GET /api/git/file - Get file content
+export async function handleGitFile(url: URL) {
+  const filePath = url.searchParams.get('path')
+
+  if (!filePath) {
+    return errorResponse('path is required', 400)
+  }
+
+  // Security: prevent directory traversal
+  if (filePath.includes('..') || filePath.startsWith('/')) {
+    return errorResponse('Invalid path', 400)
+  }
+
+  const fullPath = `${WORKING_DIR}/${filePath}`
+
+  try {
+    const file = Bun.file(fullPath)
+    const exists = await file.exists()
+
+    if (!exists) {
+      return errorResponse('File not found', 404)
+    }
+
+    // Check if binary
+    const content = await file.text()
+    const isBinary = /[\x00-\x08\x0E-\x1F]/.test(content.slice(0, 1000))
+
+    if (isBinary) {
+      return jsonResponse({
+        path: filePath,
+        isBinary: true,
+        content: null,
+        size: file.size
+      })
+    }
+
+    // Get file extension for syntax highlighting hint
+    const ext = filePath.split('.').pop()?.toLowerCase() || ''
+
+    return jsonResponse({
+      path: filePath,
+      isBinary: false,
+      content,
+      size: file.size,
+      extension: ext
+    })
+  } catch (e: any) {
+    return errorResponse(e.message, 500)
+  }
+}

server/routes/index.ts

@@ -10,7 +10,7 @@ import { handleTables, handleStats, handleTableSchema, handleTableData, handleQu
 import { handleWhisperRoutes } from './whisper'
 import { handleRecordingsRoutes } from './recordings'
 import { handleClaudeStatus } from './claude-status'
-import { handleGitStatus, handleGitDiff, handleGitLog, handleGitLogCommit, handleGitCompare, handleGitBranches, handleGitCurrentBranch } from './git'
+import { handleGitStatus, handleGitDiff, handleGitLog, handleGitLogCommit, handleGitCompare, handleGitBranches, handleGitCurrentBranch, handleGitTree, handleGitFile } from './git'
 
 export async function handleRequest(req: Request): Promise<Response> {
   const url = new URL(req.url)
@@ -220,5 +220,13 @@ export async function handleRequest(req: Request): Promise<Response> {
     return handleGitCurrentBranch()
   }
 
+  if (path === '/api/git/tree' && req.method === 'GET') {
+    return handleGitTree(url)
+  }
+
+  if (path === '/api/git/file' && req.method === 'GET') {
+    return handleGitFile(url)
+  }
+
   return notFoundResponse()
 }