style(ui): Padding +20% en tablas, botones, inputs

El Lujo del Espacio (Acabado Espectacular mejora #3):
- table_core/rendering.zig: padding celdas 4px → 5px
- button.zig: padding botones 8px → 10px
- text_input.zig: padding inputs 4px → 5px

UI más "respirada" y profesional estilo Laravel.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/widgets/button.zig

@@ -42,7 +42,7 @@ pub const ButtonConfig = struct {
     /// Disabled state
     disabled: bool = false,
     /// Padding around text
-    padding: u32 = 8,
+    padding: u32 = 10,
     /// Corner radius (0 = square, default 4 for fancy mode)
     corner_radius: u8 = 4,
 };

src/widgets/table_core/rendering.zig

@@ -83,19 +83,19 @@ pub fn drawEditingOverlay(
     if (selection_start != selection_end) {
         const sel_min = @min(selection_start, selection_end);
         const sel_max = @max(selection_start, selection_end);
-        const sel_x = x + 4 + @as(i32, @intCast(sel_min * 8)); // 8px por caracter (monospace)
+        const sel_x = x + 5 + @as(i32, @intCast(sel_min * 8)); // 8px por caracter (monospace)
         const sel_width = @as(u32, @intCast((sel_max - sel_min) * 8));
         // Color azul semitransparente para selección
         ctx.pushCommand(Command.rect(sel_x, text_y, sel_width, 16, colors.cell_selection_bg));
     }
 
     // Texto (encima de la selección)
-    ctx.pushCommand(Command.text(x + 4, text_y, text_to_show, colors.cell_editing_text));
+    ctx.pushCommand(Command.text(x + 5, text_y, text_to_show, colors.cell_editing_text));
 
     // Cursor parpadeante (simplificado: siempre visible)
     // Solo mostrar cursor si NO hay selección completa
     if (selection_start == selection_end) {
-        const cursor_x = x + 4 + @as(i32, @intCast(cursor_pos * 8)); // Asumiendo fuente monospace 8px
+        const cursor_x = x + 5 + @as(i32, @intCast(cursor_pos * 8)); // Asumiendo fuente monospace 8px
         ctx.pushCommand(Command.rect(cursor_x, text_y, 2, 16, colors.cell_editing_border));
     }
 }
@@ -114,10 +114,10 @@ pub fn drawCellText(
     const text_y = y + @as(i32, @intCast((height -| 16) / 2));
 
     const text_x = switch (text_align) {
-        0 => x + 4, // Left
+        0 => x + 5, // Left
         1 => x + @as(i32, @intCast(width / 2)) - @as(i32, @intCast(text.len * 4)), // Center (aprox)
-        2 => x + @as(i32, @intCast(width)) - @as(i32, @intCast(text.len * 8 + 4)), // Right
-        3 => x + 4, // Default left
+        2 => x + @as(i32, @intCast(width)) - @as(i32, @intCast(text.len * 8 + 5)), // Right
+        3 => x + 5, // Default left
     };
 
     ctx.pushCommand(Command.text(text_x, text_y, text, color));

src/widgets/text_input.zig

@@ -210,7 +210,7 @@ pub const TextInputConfig = struct {
     /// Password mode (show dots instead of text)
     password: bool = false,
     /// Padding inside the input
-    padding: u32 = 4,
+    padding: u32 = 5,
     /// Override background color. If null, uses theme default.
     bg_color: ?Style.Color = null,
     /// Override text color (for validation feedback). If null, uses theme default.