Fix styling conflict in DevRank Grid where Heatmap colors override Row Selection.

Requirements:

1. Row Selection Wins: When a row is selected (.neo-selected), the selection background color must override any Heatmap cell background colors (.heatmap-cell-*).
2. Reset Text Styles: When a row is selected or hovered, reset font-weight and text-shadow to ensure readability against the selection/hover background.
3. Scope: Apply changes to resources/scss/src/apps/devrank/GridContainer.scss.

Implementation Strategy:

• Use CSS nesting/specificity to target .neo-selected rows within .devrank-grid-container.
• Define overrides for .neo-grid-cell when inside a selected or hovered row.