fix(spawn): strip ANSI codes from zellij list-sessions output

Zellij outputs colored text with ANSI escape codes, which caused
session name parsing to fail. Now strips escape codes before parsing.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.playwright-mcp/console-2026-02-26T22-17-15-253Z.log

@@ -0,0 +1 @@
+[   94144ms] [ERROR] Failed to load resource: the server responded with a status of 500 (Internal Server Error) @ http://127.0.0.1:7400/api/spawn:0

.playwright-mcp/console-2026-02-26T22-19-49-481Z.log

@@ -0,0 +1 @@
+[     398ms] [WARNING] cdn.tailwindcss.com should not be used in production. To use Tailwind CSS in production, install it as a PostCSS plugin or use the Tailwind CLI: https://tailwindcss.com/docs/installation @ https://cdn.tailwindcss.com/:63

amc_server/mixins/spawn.py

@@ -99,9 +99,11 @@ class SpawnMixin:
 
         try:
             # Check rate limit inside lock
+            # Use None sentinel to distinguish "never spawned" from "spawned at time 0"
+            # (time.monotonic() can be close to 0 on fresh process start)
             now = time.monotonic()
-            last_spawn = _spawn_timestamps.get(project, 0)
-            if now - last_spawn < SPAWN_COOLDOWN_SEC:
+            last_spawn = _spawn_timestamps.get(project)
+            if last_spawn is not None and now - last_spawn < SPAWN_COOLDOWN_SEC:
                 remaining = SPAWN_COOLDOWN_SEC - (now - last_spawn)
                 self._send_json(429, {
                     'ok': False,
@@ -177,8 +179,11 @@ class SpawnMixin:
             )
             if result.returncode != 0:
                 return False
+            # Strip ANSI escape codes (Zellij outputs colored text)
+            ansi_pattern = re.compile(r'\x1b\[[0-9;]*m')
+            output = ansi_pattern.sub('', result.stdout)
             # Parse line-by-line to avoid substring false positives
-            for line in result.stdout.splitlines():
+            for line in output.splitlines():
                 # Zellij outputs "session_name [Created ...]" or just "session_name"
                 session_name = line.strip().split()[0] if line.strip() else ''
                 if session_name == ZELLIJ_SESSION:

dashboard/components/SpawnModal.js

@@ -75,12 +75,15 @@ export function SpawnModal({ isOpen, onClose, onSpawn, currentProject }) {
   }, [isOpen, handleClose]);
 
   const handleSpawn = async () => {
-    const project = currentProject || selectedProject;
-    if (!project) {
+    const rawProject = currentProject || selectedProject;
+    if (!rawProject) {
       setError('Please select a project');
       return;
     }
 
+    // Extract project name from full path (sidebar passes projectDir like "/Users/.../projects/amc")
+    const project = rawProject.includes('/') ? rawProject.split('/').pop() : rawProject;
+
     setLoading(true);
     setError(null);
 
@@ -169,7 +172,7 @@ export function SpawnModal({ isOpen, onClose, onSpawn, currentProject }) {
             <div class="flex flex-col gap-1.5">
               <label class="text-label font-medium text-dim">Project</label>
               <div class="rounded-xl border border-selection/75 bg-bg/70 px-3 py-2 text-sm text-bright">
-                ${currentProject}
+                ${currentProject.includes('/') ? currentProject.split('/').pop() : currentProject}
               </div>
             </div>
           `}