feat: batch of fixes and features (#56)

## Summary

This PR includes a batch of bug fixes and new features:

### Bug Fixes
- **Links in chat history now open in default browser** instead of navigating within the app
  - Closes #54
- **Allow spaces in tab names** - space key no longer acts like enter when renaming tabs
  - Closes #52

### New Features
- **`/cd` command** - Change the working directory of an active tab with context preservation
  - Closes #55
- **`/search` command** - Search and highlight matches within the conversation
  - Closes #32

## Test Plan
- [ ] Click a link in chat history and verify it opens in the default browser
- [ ] Rename a tab and verify spaces can be typed
- [ ] Use `/cd <path>` and verify the directory changes while preserving conversation context
- [ ] Use `/search <query>` and verify matches are highlighted in yellow
- [ ] Use `/search` with no args to clear the search highlighting

✨ This PR was created with help from Hikari~ 🌸

Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Reviewed-on: #56
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

src/lib/commands/slashCommands.ts

@@ -3,6 +3,7 @@ import { invoke } from "@tauri-apps/api/core";
 import { claudeStore } from "$lib/stores/claude";
 import { characterState } from "$lib/stores/character";
 import { setSkipNextGreeting } from "$lib/tauri";
+import { searchState } from "$lib/stores/search";
 
 export interface SlashCommand {
   name: string;
@@ -11,6 +12,71 @@ export interface SlashCommand {
   execute: (args: string) => Promise<void> | void;
 }
 
+async function changeDirectory(path: string): Promise<void> {
+  const conversationId = get(claudeStore.activeConversationId);
+  if (!conversationId) {
+    claudeStore.addLine("error", "No active conversation");
+    return;
+  }
+
+  if (!path.trim()) {
+    const currentDir = get(claudeStore.currentWorkingDirectory);
+    claudeStore.addLine("system", `Current directory: ${currentDir}`);
+    return;
+  }
+
+  try {
+    characterState.setState("thinking");
+    claudeStore.addLine("system", `Changing directory to: ${path}`);
+
+    const currentDir = get(claudeStore.currentWorkingDirectory);
+    const validatedPath = await invoke<string>("validate_directory", { path, currentDir });
+
+    // Capture conversation history before disconnecting
+    const conversationHistory = claudeStore.getConversationHistory();
+
+    await invoke("stop_claude", { conversationId });
+
+    // Wait for clean shutdown
+    await new Promise((resolve) => setTimeout(resolve, 500));
+
+    claudeStore.setWorkingDirectory(validatedPath);
+
+    setSkipNextGreeting(true);
+
+    await invoke("start_claude", {
+      conversationId,
+      options: {
+        working_dir: validatedPath,
+      },
+    });
+
+    // Wait for connection to establish
+    await new Promise((resolve) => setTimeout(resolve, 1000));
+
+    // Restore context if there was conversation history
+    if (conversationHistory) {
+      const contextMessage = `[CONTEXT RESTORATION]
+I just changed the working directory from ${currentDir} to ${validatedPath}. Here's our conversation so far:
+
+${conversationHistory}
+
+Please continue where we left off. You are now operating in the new directory.`;
+
+      await invoke("send_prompt", {
+        conversationId,
+        message: contextMessage,
+      });
+    }
+
+    claudeStore.addLine("system", `Changed directory to: ${validatedPath}`);
+    characterState.setState("idle");
+  } catch (error) {
+    claudeStore.addLine("error", `Failed to change directory: ${error}`);
+    characterState.setTemporaryState("error", 3000);
+  }
+}
+
 async function startNewConversation(): Promise<void> {
   const conversationId = get(claudeStore.activeConversationId);
   if (!conversationId) {
@@ -48,6 +114,12 @@ async function startNewConversation(): Promise<void> {
 }
 
 export const slashCommands: SlashCommand[] = [
+  {
+    name: "cd",
+    description: "Change the working directory",
+    usage: "/cd <path>",
+    execute: changeDirectory,
+  },
   {
     name: "clear",
     description: "Clear the terminal display (keeps conversation context)",
@@ -74,6 +146,20 @@ export const slashCommands: SlashCommand[] = [
       claudeStore.addLine("system", `Available commands:\n${helpText}`);
     },
   },
+  {
+    name: "search",
+    description: "Search within the conversation (use /search to clear)",
+    usage: "/search [query]",
+    execute: (args: string) => {
+      if (!args.trim()) {
+        searchState.clear();
+        claudeStore.addLine("system", "Search cleared");
+        return;
+      }
+      searchState.setQuery(args.trim());
+      claudeStore.addLine("system", `Searching for: "${args.trim()}"`);
+    },
+  },
   {
     name: "summarise",
     description: "Get a summary of the entire conversation",