feat(chat): align command, shell, and subtask UX (#444)

* feat: reload interface after skills operations

- Adds configurable delay before interface reload after skills changes
- Introduces polling to wait for application health after reload
- Updates UI to show reload message when installing or modifying skills

* feat: distinguish skills from commands in UI

- Displays skill badge for commands that are registered skills
- Prevents editing skills through command management interface
- Triggers interface reload after skill operations to reflect changes

* feat(chat): align command and subtask UX with opencode parity

Route commands/shell via parity paths, render delegated subtasks cleanly, and surface child-session permission/question prompts in parent chat.

* fix(ProjectEditDialog): improve layout consistency

* fix: update task icon and session handling in ToolPart

* feat(chat): add shell-mode input and collapse shell bridge output

Switch leading ! to shell mode UX and fold synthetic shell bridge assistant messages into the user shell bubble with inline output actions.

* fix: remove AI agent icon from file mention autocomplete

* fix: remove unused icon import from file mention component

packages/ui/src/lib/messages/agentMentions.ts

@@ -29,14 +29,15 @@ export const parseAgentMentions = (rawText: string, agents: Agent[]): ParsedAgen
   }
 
   const nonPrimaryAgents = agents.filter((agent) => agent.mode && agent.mode !== "primary");
-  if (nonPrimaryAgents.length === 0 || !rawText.includes("#")) {
+  if (nonPrimaryAgents.length === 0 || !rawText.includes("@")) {
     return { sanitizedText: rawText, mention: null };
   }
 
   let firstMention: ParsedAgentMention | null = null;
 
   for (const agent of nonPrimaryAgents) {
-    const pattern = new RegExp(`#${agent.name}\\b`, "gi");
+    const escapedAgentName = agent.name.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
+    const pattern = new RegExp(`@${escapedAgentName}\\b`, "gi");
     let match: RegExpExecArray | null;
 
     while ((match = pattern.exec(rawText)) !== null) {