feat: add LexAI status bar and suggestion panel

- Implemented a status bar item for LexAI with dynamic status updates (ready, processing, notReady).
- Created a suggestion panel for displaying and interacting with AI-generated suggestions.
- Added functionality for accepting, regenerating, and discarding suggestions within the suggestion zone.
- Introduced configuration options for writing style, prompt patterns, personas, and formats.
- Integrated progress indicators for long-running tasks and improved user feedback.
- Established TypeScript configuration for the vscode package.

src/lib/providers.ts

@@ -115,6 +115,7 @@ function promptParamModifiers(params?: PromptParams): string {
 const PROMPT_INVARIANTS =
   ' Return ONLY the engineered prompt, ready to paste into an AI chat — no explanations, no surrounding quotes, no preamble. ' +
   'Keep it self-contained, and use the cheapest structure that meets the goal. ' +
+  'Format with clear line breaks and short labeled sections (not one long paragraph) so a human can read it easily. ' +
   'If the input is missing information the prompt needs, mark it as a [BRACKETED] placeholder rather than inventing facts.';
 
 export function getSystemPrompt(action: string, style?: string, promptParams?: PromptParams): string {