fix(terminal): improve terminal dimensions and fit timing

Use min-height:0 on xterm-wrapper (flex child) instead of height:100%
to properly fill available space in flex layout. Add delayed fit()
calls after initialization to let the layout stabilize before
calculating terminal cell dimensions.

💘 Generated with Crush

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

web/src/components/Shell.jsx

@@ -439,6 +439,12 @@ export default function Shell({ api }) {
         const entry = tabsRef.current[tab.id]
         if (entry) entry.fitAddon.fit()
       }
+      setTimeout(() => {
+        for (const tab of tabsRef.current._tabList || []) {
+          const entry = tabsRef.current[tab.id]
+          if (entry) entry.fitAddon.fit()
+        }
+      }, 150)
     })
   }, [initTerminal])
 
@@ -472,11 +478,11 @@ export default function Shell({ api }) {
       requestAnimationFrame(() => {
         if (cancelled) return
         const entry = tabsRef.current[tab.id]
-        if (entry) entry.fitAddon.fit()
+        if (entry) {
+          entry.fitAddon.fit()
+          setTimeout(() => { if (!cancelled) entry.fitAddon.fit() }, 100)
+        }
       })
-    }
-
-    for (const tab of tabs) {
       if (!tabsRef.current[tab.id]) {
         tryInitTab(tab, 0)
       }

web/src/styles/global.css

@@ -276,8 +276,8 @@ input::placeholder { color: var(--text-disabled); }
 .sidebar-tab:hover { background: var(--bg-card); color: var(--text-primary); }
 .sidebar-tab.active { background: var(--accent); color: #fff; font-weight: 600; }
 
-.shell-layout { display: flex; height: 100%; }
+.shell-layout { display: flex; height: 100%; overflow: hidden; }
-.shell-terminal-col { flex: 1; display: flex; flex-direction: column; min-width: 0; min-height: 0; overflow: hidden; }
+.shell-terminal-col { flex: 1; display: flex; flex-direction: column; min-width: 0; overflow: hidden; }
 
 .shell-tabs-bar {
   display: flex; align-items: center; background: var(--bg-surface);
@@ -382,7 +382,7 @@ input::placeholder { color: var(--text-disabled); }
 }
 .shell-menu-divider { height: 1px; background: var(--border); margin: 4px 6px; }
 
-.shell-xterm-wrapper { flex: 1; height: 100%; background: var(--bg); overflow: hidden; position: relative; }
+.shell-xterm-wrapper { flex: 1; min-height: 0; background: var(--bg); overflow: hidden; position: relative; }
 .shell-xterm-instance {
   position: absolute;
   inset: 0;
@@ -402,7 +402,7 @@ input::placeholder { color: var(--text-disabled); }
 .shell-tab.ai-tab .shell-tab-name { color: var(--accent); }
 .shell-tab.ai-tab { border-bottom-color: var(--accent); }
 
-.shell-ai-col { width: 320px; border-left: 1px solid var(--border); background: var(--bg-surface); display: flex; flex-direction: column; flex-shrink: 0; }
+.shell-ai-col { width: 320px; max-width: 320px; border-left: 1px solid var(--border); background: var(--bg-surface); display: flex; flex-direction: column; flex-shrink: 0; overflow: hidden; }
 .ai-panel-header { padding: 12px 16px; border-bottom: 1px solid var(--border); font-weight: 700; font-size: 13px; color: var(--accent); display: flex; align-items: center; justify-content: space-between; }
 .shell-analyze-btn {
   display: flex; align-items: center; gap: 4px;