chore: bump version to 0.3.0

feat(shell): real terminal with xterm.js + PTY over WebSocket

Replace fake shell input with a full PTY-backed terminal using xterm.js.
Apps like btop, vim, htop now work. AI chat panel is always visible.

Backend:
- Add WebSocket handler /api/ws/terminal with creack/pty
- Allocate real pseudo-terminal with TERM=xterm-256color
- Bidirectional I/O + dynamic resize via pty.Setsize
- Skip JSON headers on /api/ws/* paths for WebSocket upgrade

Frontend:
- Integrate xterm.js with FitAddon and WebLinksAddon
- Cyberpunk color theme matching app design
- ResizeObserver for automatic terminal resizing
- AI assistant panel always visible (340px, no toggle)
- Connection status indicator (green/red dot)

Dependencies:
- Go: github.com/gorilla/websocket, github.com/creack/pty/v2
- npm: @xterm/xterm, @xterm/addon-fit, @xterm/addon-web-links

💘 Generated with Crush

Assisted-by: GLM-5.1 via Crush <crush@charm.land>

web/src/api/client.js

@@ -27,6 +27,42 @@ const api = {
   configureMCP: () => request('/mcp/configure', { method: 'POST' }),
   savePreferences: (prefs) => request('/preferences', { method: 'PUT', body: JSON.stringify(prefs) }),
   runCommand: (command, cwd) => request('/terminal', { method: 'POST', body: JSON.stringify({ command, cwd }) }),
+  sendChat: (message, stream = true) => {
+    if (!stream) {
+      return request('/chat', { method: 'POST', body: JSON.stringify({ message, stream: false }) })
+    }
+    return new Promise((resolve, reject) => {
+      fetch(`${API_BASE}/chat`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ message, stream: true }),
+      }).then(async (res) => {
+        if (!res.ok) {
+          const err = await res.json().catch(() => ({ error: res.statusText }))
+          reject(new Error(err.error || res.statusText))
+          return
+        }
+        const reader = res.body.getReader()
+        const decoder = new TextDecoder()
+        let full = ''
+        while (true) {
+          const { done, value } = await reader.read()
+          if (done) break
+          const text = decoder.decode(value, { stream: true })
+          for (const line of text.split('\n')) {
+            if (!line.startsWith('data: ')) continue
+            try {
+              const data = JSON.parse(line.slice(6))
+              if (data.error) { reject(new Error(data.error)); return }
+              if (data.done) { resolve(full); return }
+              if (data.content) full += data.content
+            } catch {}
+          }
+        }
+        resolve(full)
+      }).catch(reject)
+    })
+  },
 }
 
 export default api