feat: add theme management with light and dark modes

- Implemented a new composable `useTheme` for managing theme state.
- Added functions to read and write theme preference to local storage.
- Applied theme styles to the DOM based on user preference.
- Introduced a toggle function to switch between light and dark themes.

refactor: enhance copilot plugin functionality

- Improved request handling with sequence and document versioning.
- Refactored ghost text handling to improve clarity and efficiency.
- Updated markdown insertion logic to handle parsed content more robustly.
- Enhanced error handling and logging for better debugging.

style: update global styles for light and dark themes

- Defined CSS variables for light and dark themes to streamline styling.
- Improved overall styling consistency and responsiveness.
- Added transitions for smoother theme changes and interactions.

backend/main.py

@@ -7,7 +7,7 @@ import base64
 import uuid
 import logging
 
-from prompt import build_prompt
+from prompt import build_prompt, prepare_prompt_context
 from llm import call_ollama, call_vlm_ocr
 
 logging.basicConfig(
@@ -43,17 +43,6 @@ def _preview(text: str, limit: int = 80) -> str:
         return value
     return value[:limit] + "..."
 
-
-def _build_force_non_empty_prompt(base_prompt: str) -> str:
-    return (
-        base_prompt
-        + "\n\nStrict override for this request:\n"
-        + "- Output must be non-empty.\n"
-        + "- If you would otherwise output empty, output a single space.\n"
-        + "- Keep it short and do not repeat SUFFIX.\n"
-    )
-
-
 @app.post("/v1/completions")
 async def create_completion(request: CompletionRequest):
     request_id = str(uuid.uuid4())[:8]
@@ -67,27 +56,18 @@ async def create_completion(request: CompletionRequest):
             _preview((request.prefix or "")[-120:]),
             _preview((request.suffix or "")[:120]),
         )
+        llm_prefix, llm_suffix = prepare_prompt_context(request.prefix or "", request.suffix or "")
+        logger.info("[%s] llm_input_prefix=%r", request_id, llm_prefix)
+        logger.info("[%s] llm_input_suffix=%r", request_id, llm_suffix)
         prompt = build_prompt(request.prefix, request.suffix, request.languageId)
         result = await call_ollama(prompt, tag=f"{request_id}-primary", temperature=0.7)
 
         content = result["content"] or ""
-        source = "primary"
         if not content.strip():
-            logger.warning("[%s] primary returned empty content, starting retry", request_id)
-            retry_prompt = _build_force_non_empty_prompt(prompt)
-            retry_result = await call_ollama(retry_prompt, tag=f"{request_id}-retry1", temperature=0.4)
-            content = retry_result["content"] or ""
-            source = "retry1"
-
-        if not content.strip():
-            content = " "
-            source = "fallback-space"
-            logger.warning("[%s] retry still empty, forcing single-space fallback", request_id)
-
+            logger.warning("[%s] primary returned empty content, returning empty result", request_id)
         logger.info(
-            "[%s] completion resolved source=%s content_chars=%d content_preview='%s'",
+            "[%s] completion resolved source=primary content_chars=%d content_preview='%s'",
             request_id,
-            source,
             len(content),
             _preview(content, 120),
         )