feat(keyword-detector): show toast notification when ultrawork mode is activated (#393)

* feat(keyword-detector): show toast notification when ultrawork mode is activated

When users trigger ultrawork mode (via 'ultrawork' or 'ulw' keywords), a toast
notification now appears to confirm the mode is active. The notification is
shown once per session to avoid spamming.

Changes:
- Add detectKeywordsWithType() to identify which keyword type triggered
- Show 'Ultrawork Mode Activated' toast with success variant
- Track notified sessions to prevent duplicate toasts

Closes #392

* fix(keyword-detector): fix index bug in detectKeywordsWithType and add error logging

- Fix P1: detectKeywordsWithType now maps before filtering to preserve
  original KEYWORD_DETECTORS indices. Previously, the index used was from
  the filtered array, causing incorrect type assignment (e.g., 'search'
  match would incorrectly return 'ultrawork' type).

- Fix P2: Replace silent .catch(() => {}) with proper error logging using
  the log function for easier debugging when toast notifications fail.

---------

Co-authored-by: sisyphus-dev-ai <sisyphus-dev-ai@users.noreply.github.com>

src/hooks/keyword-detector/detector.ts

@@ -4,6 +4,11 @@ import {
   INLINE_CODE_PATTERN,
 } from "./constants"
 
+export interface DetectedKeyword {
+  type: "ultrawork" | "search" | "analyze"
+  message: string
+}
+
 export function removeCodeBlocks(text: string): string {
   return text.replace(CODE_BLOCK_PATTERN, "").replace(INLINE_CODE_PATTERN, "")
 }
@@ -15,6 +20,18 @@ export function detectKeywords(text: string): string[] {
   ).map(({ message }) => message)
 }
 
+export function detectKeywordsWithType(text: string): DetectedKeyword[] {
+  const textWithoutCode = removeCodeBlocks(text)
+  const types: Array<"ultrawork" | "search" | "analyze"> = ["ultrawork", "search", "analyze"]
+  return KEYWORD_DETECTORS.map(({ pattern, message }, index) => ({
+    matches: pattern.test(textWithoutCode),
+    type: types[index],
+    message,
+  }))
+    .filter((result) => result.matches)
+    .map(({ type, message }) => ({ type, message }))
+}
+
 export function extractPromptText(
   parts: Array<{ type: string; text?: string }>
 ): string {