fix(web): standardize font sizes to style guide scale

Map fontWeight: 700 → 600 in non-title contexts (LoginPage, FileDropZone).
Align FileDropZone badge padding to 4px grid.

Closes #70

web/src/components/items/FileDropZone.tsx

@@ -143,8 +143,8 @@ function FileRow({
         display: "flex",
         alignItems: "center",
         gap: "0.5rem",
-        padding: "0.25rem 0.4rem",
-        borderRadius: "0.375rem",
+        padding: "0.25rem 0.5rem",
+        borderRadius: "0.25rem",
         position: "relative",
       }}
     >
@@ -153,14 +153,14 @@ function FileRow({
         style={{
           width: 28,
           height: 28,
-          borderRadius: "0.375rem",
+          borderRadius: "0.25rem",
           backgroundColor: color,
           opacity: 0.8,
           display: "flex",
           alignItems: "center",
           justifyContent: "center",
           fontSize: "var(--font-xs)",
-          fontWeight: 700,
+          fontWeight: 600,
           color: "var(--ctp-crust)",
           flexShrink: 0,
         }}
@@ -239,7 +239,7 @@ function FileRow({
           cursor: "pointer",
           fontSize: "var(--font-table)",
           color: hovered ? "var(--ctp-red)" : "var(--ctp-overlay0)",
-          padding: "0 0.2rem",
+          padding: "0 0.25rem",
           flexShrink: 0,
           transition: "all 0.15s ease",
         }}

web/src/pages/LoginPage.tsx

@@ -116,7 +116,7 @@ const titleStyle: React.CSSProperties = {
   color: "var(--ctp-mauve)",
   textAlign: "center",
   fontSize: "2rem",
-  fontWeight: 700,
+  fontWeight: 600,
   marginBottom: "0.25rem",
 };
 
@@ -164,7 +164,7 @@ const btnPrimaryStyle: React.CSSProperties = {
   display: "block",
   width: "100%",
   padding: "0.75rem 1.5rem",
-  borderRadius: "0.375rem",
+  borderRadius: "0.25rem",
   fontWeight: 500,
   fontSize: "0.75rem",
   cursor: "pointer",
@@ -189,7 +189,7 @@ const btnOidcStyle: React.CSSProperties = {
   display: "block",
   width: "100%",
   padding: "0.75rem 1.5rem",
-  borderRadius: "0.375rem",
+  borderRadius: "0.25rem",
   fontWeight: 500,
   fontSize: "0.75rem",
   cursor: "pointer",