Update chat status dashboard based on feedback

[pwang347]

Fixes #313290

[Copilot]

Pull request overview

This PR updates the Chat Status Dashboard UI/UX in the workbench and enhances the Copilot workspace indexing status contribution to better reflect state (including icons), based on feedback.

Changes:

• Refactors the dashboard to show “Inline Suggestions” and each contributed chat status item as separate collapsible sections.
• Replaces action-based model/provider option pickers with native inline <select> dropdowns and adds a tri-state per-language override control for inline suggestions enablement.
• Adds icon metadata to the workspace indexing chat status item and prefixes those icons into the description string.

Show a summary per file

File	Description
src/vs/workbench/contrib/chat/browser/chatStatus/media/chatStatus.css	Adds styling for contributed section headers/status, section body text, overridden hint, and native inline <select> dropdowns.
src/vs/workbench/contrib/chat/browser/chatStatus/chatStatusDashboard.ts	Reworks dashboard rendering (collapsibles, contributed sections), introduces inline selects, and adds a tri-state per-language setting control + status text.
extensions/copilot/src/extension/workspaceChunkSearch/vscode-node/workspaceIndexingStatus.ts	Adds optional icons to the indexing status state and includes them in the chat status item description.

Copilot's findings

Comments suppressed due to low confidence (1)

src/vs/workbench/contrib/chat/browser/chatStatus/chatStatusDashboard.ts:514

• The provider option <select> is also missing a programmatic label. Since option.label is rendered in a separate <span>, screen readers may not associate it with the combobox. Consider wiring them up via <label for>/id or aria-labelledby on the select.

							optionContainer.appendChild($('span.suggest-option-text', undefined, option.label));

							const select = optionContainer.appendChild($('select.inline-select')) as HTMLSelectElement;
							for (const value of option.values) {

• Files reviewed: 3/3 changed files
• Comments generated: 9