feat(a11y): Implement ARIA accessibility sweep and keyboard navigation

- Added visually hidden labels, IDs, and names to form inputs across all key components and pages (modals, directories, chatbots)
- Added tabIndex and onKeyDown handlers to clickable table rows in OwnerProjectDetail for keyboard accessibility
- Validated existing ARIA roles and Escape key bindings on modal components

src/components/dashboard/AgentSelectionModal.jsx

@@ -33,8 +33,11 @@ export const AgentSelectionModal = ({ isOpen, onClose, onSelect }) => {
                 {/* Search */}
                 <div className="p-4 border-b border-zinc-100 dark:border-zinc-800 flex-shrink-0">
                     <div className="relative">
+                        <label htmlFor="search-agents" className="sr-only">Search agents</label>
                         <Search className="absolute left-3 top-1/2 -translate-y-1/2 text-zinc-400" size={16} />
                         <input
+                            id="search-agents"
+                            name="search-agents"
                             type="text"
                             placeholder="Search agents..."
                             className="w-full pl-9 pr-4 py-2 bg-zinc-100 dark:bg-black/20 border border-transparent focus:border-blue-500 rounded-xl text-sm outline-none transition-all dark:text-white"