feat: add Cobra CLI, LSP/MCP registries, workflow engine, and enriched dashboard

Major changes:
- Refactor CLI entry point to Cobra commands (root, setup, scan, doctor, install, update, lsp, mcp, skills, config, version)
- Add LSP registry with health checks, auto-install, and editor config generation
- Add MCP registry with editor detection, status tracking, and per-editor configuration
- Add workflow engine with planner and step execution for automated task chains
- Add conversation search, export (Markdown/JSON), and detailed token counting
- Add streaming shell chat handler with tool call/result events
- Add skill validation, dry-run testing, and export endpoints
- Enrich dashboard with Tools/Activity/Status tabs and tool cards grid
- Add PRD documentation
- Complete i18n for both EN and FR

💘 Generated with Crush

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

web/src/styles/global.css

@@ -565,6 +565,81 @@ input::placeholder { color: var(--text-disabled); }
   letter-spacing: 1px; margin-bottom: 12px; padding-bottom: 6px; border-bottom: 1px solid var(--border);
 }
 
+/* ── Dashboard Tabs ── */
+.dashboard-tabs {
+  display: flex; gap: 4px; padding: 12px 20px 0;
+  border-bottom: 1px solid var(--border); background: var(--bg-surface); flex-shrink: 0;
+}
+.dashboard-tab {
+  padding: 8px 16px; border-radius: var(--radius) var(--radius) 0 0;
+  border: 1px solid transparent; border-bottom: none; background: transparent;
+  color: var(--text-tertiary); font-size: 12px; font-weight: 600; cursor: pointer;
+  display: flex; align-items: center; gap: 6px; transition: all 0.15s;
+}
+.dashboard-tab:hover { color: var(--text-primary); background: var(--bg-hover); }
+.dashboard-tab.active { background: var(--bg-card); color: var(--accent); border-color: var(--border); }
+.dashboard-tab .tab-icon { font-size: 14px; }
+.dashboard-tab .tab-count {
+  background: var(--bg-input); padding: 1px 6px; border-radius: 10px; font-size: 10px; font-family: var(--font-mono);
+}
+.dashboard-tab .tab-count.warn { background: var(--accent-bg); color: var(--accent); }
+
+.dashboard-tools-panel { padding: 20px 24px; }
+.dashboard-tools-stats { display: flex; gap: 12px; font-size: 12px; }
+.stat-ok { color: var(--success); font-family: var(--font-mono); }
+.stat-missing { color: var(--error); font-family: var(--font-mono); }
+
+.dashboard-system-info { display: flex; gap: 8px; align-items: center; margin-bottom: 16px; font-size: 12px; color: var(--text-tertiary); }
+.sys-info-item { font-family: var(--font-mono); }
+.sys-info-sep { color: var(--text-disabled); }
+
+.tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; margin-top: 8px; }
+.tool-card {
+  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
+  padding: 14px 16px; display: flex; align-items: center; gap: 12px; transition: border-color 0.2s;
+}
+.tool-card:hover { border-color: var(--accent-dim); }
+.tool-card.installed { border-left: 3px solid var(--success); }
+.tool-card.missing { border-left: 3px solid var(--error); }
+.tool-card-icon { font-size: 20px; flex-shrink: 0; }
+.tool-card-info { flex: 1; min-width: 0; }
+.tool-card-name { font-weight: 600; font-size: 13px; color: var(--text-primary); margin-bottom: 2px; }
+.tool-card-version { font-size: 11px; color: var(--text-tertiary); display: flex; align-items: center; gap: 6px; }
+.tool-version-text { font-family: var(--font-mono); font-size: 10px; color: var(--text-disabled); }
+.status-ok { color: var(--success); }
+.status-missing { color: var(--error); }
+.tool-card-actions { flex-shrink: 0; display: flex; align-items: center; gap: 6px; }
+.tool-update-badge { background: var(--accent-bg); color: var(--accent); font-size: 10px; font-family: var(--font-mono); padding: 2px 6px; border-radius: 4px; cursor: pointer; }
+.tool-update-badge:hover { background: var(--accent-dim); }
+
+.dashboard-activity-panel { padding: 20px 24px; }
+.activity-log { display: flex; flex-direction: column; gap: 2px; }
+.notif-icon { font-size: 12px; width: 16px; text-align: center; }
+
+.dashboard-actions-panel { padding: 20px 24px; }
+.quick-actions-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 10px; margin-bottom: 24px; }
+.quick-action-btn {
+  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
+  padding: 16px 20px; display: flex; align-items: center; gap: 12px; cursor: pointer;
+  transition: all 0.2s; font-size: 13px; color: var(--text-secondary);
+}
+.quick-action-btn:hover:not(:disabled) { border-color: var(--accent-dim); background: var(--bg-hover); color: var(--text-primary); }
+.quick-action-btn:disabled { opacity: 0.5; cursor: not-allowed; }
+.quick-action-icon { font-size: 18px; }
+.quick-action-label { font-weight: 600; }
+
+.dashboard-updates-section { margin-top: 16px; }
+.updates-list { display: flex; flex-direction: column; gap: 6px; }
+.update-row {
+  display: flex; align-items: center; justify-content: space-between;
+  padding: 10px 14px; border-radius: var(--radius); background: var(--bg-card);
+  border: 1px solid var(--border);
+}
+.update-row:hover { border-color: var(--accent-dim); }
+.update-info { display: flex; align-items: center; gap: 16px; }
+.update-name { font-weight: 600; color: var(--text-primary); font-size: 13px; min-width: 100px; }
+.update-versions { color: var(--text-tertiary); font-size: 12px; font-family: var(--font-mono); }
+
 .panel-header {
   display: flex; align-items: center; justify-content: space-between; padding: 10px 16px;
   border-bottom: 1px solid var(--border); background: var(--bg-surface);