feat: implement unified session list components

- Add SessionCard component with status indicators, actions, and confirmation dialogs
- Add SessionList component with grouping (active/recent) and filtering
- Refactor dashboard.tsx to use unified components
- Refactor sessions.tsx to use unified components
- Remove duplicated session rendering logic from both pages

Refs: session-list-overhaul tasks 1-4

openspec/changes/session-list-overhaul/tasks.md

@@ -1,37 +1,37 @@
 ## 1. Create SessionCard Component
 
-- [ ] 1.1 Create `apps/web/src/components/session-card.tsx` with session display and actions
-- [ ] 1.2 Implement status indicator with color coding (running=green, building=yellow, stopped=gray, error=red)
-- [ ] 1.3 Display tool type name, session name, project/repo context
-- [ ] 1.4 Add clone mode indicator and branch name when applicable
-- [ ] 1.5 Implement action buttons: Open (running), Start (stopped), Stop (running), Delete (all)
-- [ ] 1.6 Add confirmation dialogs for Stop and Delete actions
-- [ ] 1.7 Handle loading states during actions
+- [x] 1.1 Create `apps/web/src/components/session-card.tsx` with session display and actions
+- [x] 1.2 Implement status indicator with color coding (running=green, building=yellow, stopped=gray, error=red)
+- [x] 1.3 Display tool type name, session name, project/repo context
+- [x] 1.4 Add clone mode indicator and branch name when applicable
+- [x] 1.5 Implement action buttons: Open (running), Start (stopped), Stop (running), Delete (all)
+- [x] 1.6 Add confirmation dialogs for Stop and Delete actions
+- [x] 1.7 Handle loading states during actions
 
 ## 2. Create SessionList Component
 
-- [ ] 2.1 Create `apps/web/src/components/session-list.tsx` with grouping logic
-- [ ] 2.2 Implement active sessions grouping (running, building, starting, probing)
-- [ ] 2.3 Implement recent sessions grouping (stopped, error, limited to last 5)
-- [ ] 2.4 Add section headers with counts
-- [ ] 2.5 Handle empty states for each section
-- [ ] 2.6 Support filtering by status
+- [x] 2.1 Create `apps/web/src/components/session-list.tsx` with grouping logic
+- [x] 2.2 Implement active sessions grouping (running, building, starting, probing)
+- [x] 2.3 Implement recent sessions grouping (stopped, error, limited to last 5)
+- [x] 2.4 Add section headers with counts
+- [x] 2.5 Handle empty states for each section
+- [x] 2.6 Support filtering by status
 
 ## 3. Update Dashboard Page
 
-- [ ] 3.1 Import SessionCard and SessionList in dashboard.tsx
-- [ ] 3.2 Replace existing session grid rendering with SessionList
-- [ ] 3.3 Remove duplicated session rendering code
-- [ ] 3.4 Ensure "Open sessions" section uses unified components
-- [ ] 3.5 Ensure "Recent sessions" section uses unified components
+- [x] 3.1 Import SessionCard and SessionList in dashboard.tsx
+- [x] 3.2 Replace existing session grid rendering with SessionList
+- [x] 3.3 Remove duplicated session rendering code
+- [x] 3.4 Ensure "Open sessions" section uses unified components
+- [x] 3.5 Ensure "Recent sessions" section uses unified components
 
 ## 4. Update Sessions Page
 
-- [ ] 4.1 Import SessionCard and SessionList in sessions.tsx
-- [ ] 4.2 Replace existing session list rendering with SessionList
-- [ ] 4.3 Remove duplicated session rendering code
-- [ ] 4.4 Keep page-level controls (create session button, filters)
-- [ ] 4.5 Ensure "Last Session" section uses SessionCard
+- [x] 4.1 Import SessionCard and SessionList in sessions.tsx
+- [x] 4.2 Replace existing session list rendering with SessionList
+- [x] 4.3 Remove duplicated session rendering code
+- [x] 4.4 Keep page-level controls (create session button, filters)
+- [x] 4.5 Ensure "Last Session" section uses SessionCard
 
 ## 5. Styles and Polish