Refine UI models

[namandhakad712]

# Vectora Extension v2.6

## 🚀 New Features & Improvements

### UI & Navigation
- **Actual Screenshots Added** – Replaced all placeholder images in `templates/instructions.html` with the real screenshots (`1.png`‑`6.png`, `9.png`).
- **Styled Screenshot Boxes** – New `.screenshot-box` CSS with hover‑zoom, cyan glow, rounded borders, and smooth transitions.
- **Universal “Instructions” Link** – Added to the header navigation of every page (`about.html`, `check.html`, `contact.html`, `extension.html`, `guide.html`, `instructions.html`).
- **Consistent Navigation Order** – All pages now follow:  
  `About | Extension | Guide | Checker | Instructions | Contact | Theme Toggle`.
- **Active Core Logo** – Sidebar now shows the currently‑selected provider logo (GROQ, GEMINI, CEREBRAS/GLM) with color‑coded styling.

### Model Management
- **Reduced Model Set** – Down to **13 curated models** (5 image, 5 text, 3 PDF) with clear default, fast, premium, and fallback tiers.
- **Auto‑Selection Logic** – Smart routing based on content type:
  - **Image** → `Llama 4 Maverick` (default) → fallback to `Llama 4 Scout` → Gemini options.
  - **PDF** → `Gemini 3 Flash Preview` (default) with daily‑quota warning.
  - **Text** → `Groq Compound` (default, web‑search enabled) → `GLM 4.7 Plus` (reasoning mode) when web‑search is off.
- **Categorized Dropdown** – Model selector now grouped by Image, Text, and PDF with defaults on top.
- **Web Search Toggle** – Automatically switches between Groq (search) and GLM (reasoning) models and updates the sidebar logo instantly.

### Backend & Logic
- **Strict Model Enforcement** – `main.py` now only allows the 13 approved model IDs; all others are filtered out.
- **Smart Defaults** – Toggling the “Web Search” flag changes both the backend `web_search` parameter and the UI logo.
- **Removed Manual Config Button** – The “Change Config” button in `check.html` sidebar has been eliminated in favor of automatic configuration.

### Polish & Bug Fixes
- **Check AI Button** – Shows a “Checking...” spinner while processing.
- **Side Notifications** – Immediate “Analyzing…” status updates.
- **Settings Auto‑Save** – Changes are saved instantly; the explicit “Save” button has been removed.
- **High‑DPI Screen Capture Fix** – Implemented pixel‑ratio scaling and repaint delays to eliminate blurry/white screenshots on high‑resolution displays.
- **Google Search Tool Enabled for Gemini** – Gemini models now have active `googleSearch` grounding tools.

## 📦 Installation

1. **Download** `extension-v2.6.zip`.
2. **Unzip** the folder.
3. Open Chrome (or Edge) and navigate to `chrome://extensions`.
4. Enable **Developer mode** (toggle in the top‑right).
5. Click **Load unpacked** and select the unzipped `extension` directory.
6. The extension will appear in your toolbar – click the icon to start using Vectora v2.6.

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*All changes have been committed, the repository is up‑to‑date, and the release assets are attached to this tag. Enjoy the streamlined UI and smarter model selection! 🚀*

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