Story 18: Token-by-token streaming responses

- Backend: Added OllamaProvider::chat_stream() with newline-delimited JSON parsing
- Backend: Emit chat:token events for each token received from Ollama
- Backend: Added futures dependency and stream feature for reqwest
- Frontend: Added streamingContent state and chat:token event listener
- Frontend: Real-time token display with auto-scroll
- Frontend: Markdown and syntax highlighting support for streaming content
- Fixed all TypeScript errors (tsc --noEmit)
- Fixed all Biome warnings and errors
- Fixed all Clippy warnings
- Added comprehensive code quality documentation
- Added tsc --noEmit to verification checklist

Tested and verified:
- Tokens stream in real-time
- Auto-scroll works during streaming
- Tool calls interrupt streaming correctly
- Multi-turn conversations work
- Smooth performance with no lag

src/types.ts

@@ -1,40 +1,40 @@
 export interface FileEntry {
-  name: string;
-  kind: "file" | "dir";
+	name: string;
+	kind: "file" | "dir";
 }
 
 export interface SearchResult {
-  path: string;
-  matches: number;
+	path: string;
+	matches: number;
 }
 
 export interface CommandOutput {
-  stdout: string;
-  stderr: string;
-  exit_code: number;
+	stdout: string;
+	stderr: string;
+	exit_code: number;
 }
 
 export type Role = "system" | "user" | "assistant" | "tool";
 
 export interface ToolCall {
-  id?: string;
-  type: string;
-  function: {
-    name: string;
-    arguments: string;
-  };
+	id?: string;
+	type: string;
+	function: {
+		name: string;
+		arguments: string;
+	};
 }
 
 export interface Message {
-  role: Role;
-  content: string;
-  tool_calls?: ToolCall[];
-  tool_call_id?: string;
+	role: Role;
+	content: string;
+	tool_calls?: ToolCall[];
+	tool_call_id?: string;
 }
 
 export interface ProviderConfig {
-  provider: string;
-  model: string;
-  base_url?: string;
-  enable_tools?: boolean;
+	provider: string;
+	model: string;
+	base_url?: string;
+	enable_tools?: boolean;
 }