test: add unit tests for Reflection widget

[kh-ub-ayb]

Summary

This pr adds a comprehensive unit test suite for the ReflectionMatrix (Reflection) widget. It introduces 31 test cases spanning from basic instantiation to intricate async logic (AI mentor API fetch handling) and UI-related features.

Changes

• Added 31 new unit tests in js/widgets/__tests__/reflection.test.js
• No changes to source code

Test Coverage

Describe Block	Tests	Coverage
Constructor and Constants	2	Ensures static UI constraints (width, height, icon size) are correct and basic runtime variables (AImentor, mentorsMap, chatHistory) are properly initialized.
init()	6	Recreates the initial widget display. Verifies windowFor instantiation, internal variables bound to activity, dynamic buttons appending, chat input setup, and whether startChatSession triggers correctly if history is empty.
UI Methods	3	Checks logic for the interactive showTypingIndicator / hideTypingIndicator and CSS manipulations for mentor switching (changeMentor).
Chat Logic and API Calls	16	Extensively mocks global.fetch to ensure startChatSession, generateBotReply, calls payload validity correctly. Employs timers to simulate UI delay typing logic, verifying local memory storing/fetching (saveReport), empty check before sending payloads (sendMessage), and tests the browser Blob download integration (downloadAsTxt).
HTML Security and Markdown	4	Tests sanitization strategies (escapeHTML, sanitizeHTML, safe URL extraction) isolating against potential XSS vectors when executing bot rendered responses via Markdown bindings (mdToHTML).

Scope

• Only js/widgets/__tests__/reflection.test.js was added.

Verification

• All 31 tests pass

[github-actions]

❌ Some Jest tests failed. Please check the logs and fix the issues before merging.

Failed Tests:

palette.test.js
logo.test.js
logoconstants.test.js

[kh-ub-ayb]

@walterbender @omsuneri please review

[vyagh]

please rebase

[github-actions]

❌ Some Jest tests failed. Please check the logs and fix the issues before merging.

Failed Tests:

palette.test.js
logo.test.js
logoconstants.test.js

[omsuneri]

take the latest pull from the upstream master !!

[github-actions]

✅ All Jest tests passed! This PR is ready to merge.

[kh-ub-ayb]

take the latest pull from the upstream master !!

@omsuneri I've updated the branch with the latest master and verified that all tests are passing.