fix: remove border from file explorer header per Figma design

Factory Bot · Factory Bot · commit 7670b0760405 · 2026-01-28T14:42:14.000+04:00
diff --git a/cortex-gui/src/components/FileExplorer.tsx b/cortex-gui/src/components/FileExplorer.tsx
@@ -3174,6 +3174,8 @@ export function FileExplorer(props: FileExplorerProps) {
           padding: "8px 16px",
           height: "32px",
           "flex-shrink": "0",
+          background: "transparent",
+          border: "none",
         }}
       >
         <div style={{ display: "flex", "align-items": "center", gap: "4px" }}>

Original file line number	Diff line number	Diff line change
`@@ -3174,6 +3174,8 @@ export function FileExplorer(props: FileExplorerProps) {`
`3174`	`3174`	`padding: "8px 16px",`
`3175`	`3175`	`height: "32px",`
`3176`	`3176`	`"flex-shrink": "0",`
	`3177`	`+ background: "transparent",`
	`3178`	`+ border: "none",`
`3177`	`3179`	`}}`
`3178`	`3180`	`>`
`3179`	`3181`	`<div style={{ display: "flex", "align-items": "center", gap: "4px" }}>`