Add unique accessible names to chat controls

[jdneo]

Name focusable chat controls and number sibling message fragments so Windows UI Automation can distinguish them.

fix https://github.com/microsoft/GitHub-Copilot-for-Eclipse/issues/78

with this change, the accessibility check becomes:

Those remaining warnings are the eclipse platform related issues, out of our control.

[Copilot]

Pull request overview

This PR improves accessibility of the chat UI by assigning explicit accessible names to focusable controls and ensuring repeated message fragments within a turn get unique (ordinal) accessible names, addressing issue #78 and improving Windows UI Automation distinguishability.

Changes:

• Added new i18n keys for accessibility names in both the main UI bundle and the chat bundle.
• Applied accessibility names to key chat controls (turn message StyledTexts, warning text, agent status, code blocks, and action buttons).
• Introduced per-turn ordinal naming for multiple text fragments and added unit tests to verify uniqueness.

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/i18n/messages.properties	Adds accessibility-name strings for ActionBar tools and turn/warn message fragments.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/i18n/Messages.java	Exposes new i18n accessibility-name fields for the main UI message bundle.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/WarnWidget.java	Assigns an accessible name to the warning message StyledText.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/UserTurnWidget.java	Applies ordinal accessible names to user message text blocks.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/CopilotTurnWidget.java	Applies ordinal accessible names to Copilot message text blocks.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/BaseTurnWidget.java	Adds textBlockIndex and helper to generate unique accessible names per text block.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/SubagentTurnWidget.java	Applies ordinal accessible names to subagent message text blocks.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/ThinkingSection.java	Adds accessible names for thinking heading/details text controls.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/SourceViewerComposite.java	Adds accessible names for code blocks and copy/insert buttons (via updated helper signature).
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/AgentStatusLabel.java	Adds an accessible name for the tool status StyledText.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/AgentMessageWidget.java	Adds accessible names for coding agent title/description controls.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/ActionBar.java	Adds accessible names for send-to-job and tool configuration buttons.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/messages.properties	Adds chat-bundle accessibility-name strings (agent widgets, subagent, code block/buttons, thinking).
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/Messages.java	Exposes new chat-bundle accessibility-name fields.
com.microsoft.copilot.eclipse.ui.test/src/com/microsoft/copilot/eclipse/ui/chat/BaseTurnWidgetTestSupport.java	Introduces shared SWT + service mocking fixture for turn widget tests.
com.microsoft.copilot.eclipse.ui.test/src/com/microsoft/copilot/eclipse/ui/chat/BaseTurnWidgetPartialRenderTest.java	Refactors to reuse the shared test fixture.
com.microsoft.copilot.eclipse.ui.test/src/com/microsoft/copilot/eclipse/ui/chat/BaseTurnWidgetAccessibilityTest.java	Adds a test asserting unique accessible names for multiple text blocks in one turn.
.github/copilot-instructions.md	Documents the new accessibility naming convention for focusable sibling controls.

Comments suppressed due to low confidence (1)

com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/AgentMessageWidget.java:94

• params.getDescription().substring(0, 100) will throw StringIndexOutOfBoundsException when the description is shorter than 100 characters. This can crash rendering for short agent descriptions; truncate conditionally instead.

          Messages.agentMessageWidget_messageAccessibilityName);

      String reducedDescription = StringUtils.isBlank(params.getDescription()) ? ""
          : params.getDescription().substring(0, 100) + "...";
      descLabel.setMarkup(reducedDescription);