# Dev Log: Collapsible Filter Panel & UI Update

## Task Description
Implemented a collapsible filter panel for the Deals Dashboard (`/dashboard`) to replace the static filter form. The goal was to improve UI density and usability, following specific design mockups (`FilterPanel_Update_CLOSED.png` and `FilterPanel_Update_OPEN.png`).

## Changes Implemented

### 1. HTML Restructuring (`templates/dashboard.html`)
- Replaced the old `.filters-container` and `.deal-counter-wrapper` with a new component: `.filter-panel` (`#filter-panel`).
- The panel has two distinct states managed by CSS classes: `.filter-panel-closed` (42px height) and `.filter-panel-open` (92px height).
- **Closed State Content**:
    - Filter Icon (toggle)
    - "Deals Found" counter (Left)
    - "New Deals Found" notification (Right)
    - "Refresh Now" button (Right)
- **Open State Content**:
    - Filter Icon (toggle)
    - 6 Sliders (Min Below Avg, Min Profit, Min Margin, Max Sales Rank, Min Profit Trust, Min Seller Trust)
    - "Apply" and "Reset" buttons (Stacked, Right)

### 2. CSS Styling (`static/global.css`)
- Imported **Open Sans** font (weights 400, 700) for the new panel components.
- **Container Styling**:
    - Width: 1333px
    - Background: `#1f293c`
    - Border: 1px solid `#000000`
    - Radius: 8px
    - Centered horizontally with `margin: 0 auto`.
    - Positioned approx. 135px from browser top (via margin offset relative to header).
- **Slider Styling**:
    - Track: `#304163` (10px height)
    - Thumb: `#566e9e` (18px circle), Border 1px solid `#7397c2`.
    - Labels are stacked *above* the sliders (left-aligned) with specific spacing.
- **Button Styling**:
    - Color: `#566e9e`
    - Border: 2px solid `#7397c2`
    - Font: Open Sans Bold 12px White.
    - Size: 52px x 28px.

### 3. JavaScript Logic (`templates/dashboard.html`)
- **Toggle Logic**: Implemented `toggleFilterPanel(isOpen)` to switch CSS classes.
    - Clicking the filter icon toggles the state.
    - Clicking "Apply" closes the panel.
- **Apply/Reset Behavior**:
    - **Apply**: Triggers `fetchDeals()` and closes the panel.
    - **Reset**: Resets slider UI values and hidden inputs to defaults but **does NOT** trigger `fetchDeals()`. The user must click Apply to confirm.
- **Refresh Logic**:
    - The "Refresh Now" link in the closed bar triggers `fetchDeals()` and resets the "New Deals found" counter.
- **Polling Updates**:
    - Updated the polling interval logic to target the new `#new-deals-text` element in the closed panel.

## Key Learnings & Decisions
- **Stacked Sliders**: The visual requirement for "left aligned" header and slider with 20px padding implied a stacked layout (Label above Slider) rather than side-by-side, which was confirmed by checking the mockup image.
- **Font Integration**: The "Open Sans" font was not previously imported globally, so it was added to the `@import` in `global.css`.
- **Form Submission**: The original form used a `submit` event. The new design uses standalone buttons outside the form element's logical flow (visually), so explicit `click` listeners were used instead of form submission events.
- **State Persistence**: The "Reset" button logic was specifically modified to *not* auto-fetch, adhering to the requirement "settings do not change ... unless the user ... clicks the 'Apply' button".

## Verification
- Verified visually using Playwright screenshots (`dashboard_closed.png`, `dashboard_open.png`).
- Confirmed dimensions (92px/42px heights, 1333px width) and color codes match specifications.
- Verified toggle interactions and deal fetching logic.