feat: agent concurrency, conversation summaries, AI tools config, UI polish

- Agent slot limiter for concurrent tool execution
- Conversation summarization with soft-delete (MarkSummarized)
- ANSI stripping in terminal tool output
- Configurable crush-run timeout (default 600s, max 900s)
- Starship theme refactor, AI tools config grid, system update UI
- Streaming segments refactor, summarized messages block in feed
- CSS: headings, scrollbars, tool cards, summary block styles
- i18n additions (en+fr) for tools, updates, config

💘 Generated with Crush

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

web/src/styles/global.css

@@ -379,11 +379,11 @@ input::placeholder { color: var(--text-disabled); }
 .shell-menu-item-row { display: flex; align-items: center; }
 .shell-menu-item-icon {
   display: flex; align-items: center; justify-content: center;
-  width: 24px; height: 24px; border-radius: var(--radius);
-  background: transparent; border: none; color: var(--text-disabled);
+  width: 26px; height: 26px; border-radius: var(--radius);
+  background: var(--bg-card); border: 1px solid var(--border); color: var(--text-secondary);
   cursor: pointer; transition: all 0.1s; flex-shrink: 0;
 }
-.shell-menu-item-icon:hover { background: var(--accent-bg); color: var(--accent); }
+.shell-menu-item-icon:hover { background: var(--accent-bg); color: var(--accent); border-color: var(--accent-dim); }
 .shell-menu-empty {
   font-size: 12px; color: var(--text-disabled); padding: 8px 10px;
   font-style: italic;
@@ -459,7 +459,7 @@ input::placeholder { color: var(--text-disabled); }
 .shell-ai-token-fill { height: 100%; background: var(--accent); border-radius: 2px; transition: width 0.4s, background 0.3s; }
 .shell-ai-token-fill.warn { background: var(--warning); }
 .shell-ai-token-text { font-size: 10px; font-family: var(--font-mono); color: var(--text-tertiary); white-space: nowrap; }
-.ai-panel-messages { flex: 1; overflow-y: auto; padding: 12px; display: flex; flex-direction: column; gap: 8px; }
+.ai-panel-messages { flex: 1; overflow-y: auto; padding: 12px; display: flex; flex-direction: column; gap: 8px; scrollbar-width: thin; scrollbar-color: var(--border) transparent; }
 .ai-message { padding: 8px 12px; border-radius: var(--radius); font-size: 13px; line-height: 1.5; word-break: break-word; }
 .ai-message.user { background: var(--bg-elevated); border-left: 3px solid var(--accent-bright); color: var(--text-primary); }
 .ai-message.user.analysis { border-left-color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, var(--bg-elevated)); }
@@ -511,7 +511,7 @@ input::placeholder { color: var(--text-disabled); }
 .shell-mermaid-loading { padding: 16px; text-align: center; color: var(--text-tertiary); font-size: 12px; }
 .shell-mermaid-error { padding: 10px 12px; color: var(--accent-bright); font-family: var(--font-mono); font-size: 12px; white-space: pre-wrap; }
 
-.ai-message table { width: 100%; border-collapse: collapse; margin: 6px 0; font-size: 12px; display: block; overflow-x: auto; }
+.ai-message table { width: 100%; border-collapse: collapse; margin: 6px 0; font-size: 12px; display: block; overflow-x: auto; scrollbar-width: thin; scrollbar-color: var(--border) transparent; }
 .ai-message thead, .ai-message tbody { display: table-row-group; }
 .ai-message th { background: var(--bg-surface); padding: 4px 8px; text-align: left; font-weight: 600; border: 1px solid var(--border); color: var(--text-secondary); white-space: nowrap; }
 .ai-message td { padding: 3px 8px; border: 1px solid var(--border); color: var(--text-primary); white-space: nowrap; }
@@ -1024,8 +1024,10 @@ input::placeholder { color: var(--text-disabled); }
 .feed-content tr:nth-child(even) td { background: var(--bg-surface); }
 .feed-content hr, .ai-message hr { border: none; border-top: 1px solid var(--border); margin: 12px 0; }
 .inline-code { background: var(--bg-input); padding: 2px 6px; border-radius: 4px; font-family: var(--font-mono); font-size: 13px; color: var(--accent-muted); }
-.msg-h3 { font-size: 16px; font-weight: 700; color: var(--text-primary); margin: 10px 0 4px; display: block; }
-.msg-h4 { font-size: 14px; font-weight: 700; color: var(--text-secondary); margin: 8px 0 3px; display: block; }
+.msg-h1 { font-size: 20px; font-weight: 800; color: var(--accent); margin: 16px 0 8px; display: block; }
+.msg-h2 { font-size: 17px; font-weight: 700; color: var(--text-primary); margin: 12px 0 6px; display: block; }
+.msg-h3 { font-size: 15px; font-weight: 700; color: var(--text-primary); margin: 10px 0 4px; display: block; }
+.msg-h4 { font-size: 13px; font-weight: 600; color: var(--text-secondary); margin: 8px 0 3px; display: block; }
 .msg-bullet { display: block; padding-left: 4px; margin: 1px 0; color: var(--text-primary); }
 .msg-step { display: flex; gap: 8px; align-items: baseline; margin: 1px 0; }
 .msg-step-num { color: var(--accent); font-weight: 700; font-family: var(--font-mono); font-size: 13px; flex-shrink: 0; min-width: 20px; }
@@ -1133,6 +1135,22 @@ input::placeholder { color: var(--text-disabled); }
 .feed-collapsed-count { font-size: 10px; color: var(--text-disabled); font-family: var(--font-mono); }
 .feed-expanded-messages { animation: fadeIn 0.2s ease-out; }
 
+.feed-summary-block { margin: 4px 0; }
+.feed-summary-header {
+  display: flex; align-items: center; gap: 10px;
+  padding: 8px 16px;
+  background: var(--bg-surface); border: 1px solid var(--border);
+  border-radius: var(--radius); cursor: pointer;
+  transition: all 0.2s ease;
+}
+.feed-summary-header:hover { background: var(--bg-hover); border-color: var(--accent-dim); }
+.feed-summary-header svg { color: var(--accent); flex-shrink: 0; }
+.feed-summary-text { font-size: 11px; color: var(--text-tertiary); flex: 1; font-weight: 600; }
+.feed-summary-toggle { font-size: 10px; color: var(--accent); font-family: var(--font-mono); }
+
+.skill-list-info { display: flex; flex-direction: column; flex: 1; min-width: 0; }
+.skills-list { display: flex; flex-direction: column; gap: 2px; }
+
 /* ── Studio Tool Blocks ── */
 .studio-tool-block {
   background: var(--bg-surface);
@@ -1294,3 +1312,51 @@ input::placeholder { color: var(--text-disabled); }
 .shell-xterm-instance .xterm-link:hover {
   color: var(--accent-muted) !important;
 }
+
+.config-ai-tools-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
+  gap: 10px;
+  margin-bottom: 8px;
+}
+
+.config-ai-tool-card {
+  display: flex;
+  flex-direction: column;
+  padding: 14px;
+  border-radius: var(--radius);
+  background: var(--bg-card);
+  border: 1px solid var(--border);
+  transition: border-color 0.15s;
+  min-height: 120px;
+}
+
+.config-ai-tool-card:hover {
+  border-color: var(--accent-dim);
+}
+
+.config-ai-tool-header {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  margin-bottom: 8px;
+}
+
+.config-ai-tool-icon {
+  font-size: 18px;
+  line-height: 1;
+}
+
+.config-ai-tool-name {
+  font-weight: 600;
+  font-size: 13px;
+  color: var(--text-primary);
+}
+
+.config-ai-tool-desc {
+  font-size: 11px;
+  color: var(--text-tertiary);
+  line-height: 1.4;
+  margin-bottom: 10px;
+  flex: 1;
+}