feat: profile page shows #id label and supports copying username

- Add small gray #id label below username on profile page
- Click username copies it to clipboard with toast feedback
- Add name-copied translation to en-US, zh-CN, zh-TW

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Mivik

phira/locales/en-US/profile.ftl

@@ -17,3 +17,5 @@ load-record-failed = Failed to load records.
 last-login = Last login: { $time }
 badge-admin = Admin
 badge-sponsor = Sponsor
+
+name-copied = Name copied.

phira/locales/zh-CN/profile.ftl

@@ -17,3 +17,5 @@ load-record-failed = 加载游玩记录失败
 last-login = 最近登录：{ $time }
 badge-admin = 管理员
 badge-sponsor = 赞助者
+
+name-copied = 名称已复制

phira/locales/zh-TW/profile.ftl

@@ -17,3 +17,5 @@ load-record-failed = 載入遊玩紀錄失敗
 last-login = 上次登入於：{ $time }
 badge-admin = 管理員
 badge-sponsor = 贊助者
+
+name-copied = 名稱已複製

phira/src/scene/profile.rs

@@ -46,6 +46,7 @@ pub struct ProfileScene {
     icon_user: SafeTexture,
 
     btn_back: RectButton,
+    btn_name: RectButton,
     btn_open_web: DRectButton,
     btn_logout: DRectButton,
     btn_delete: DRectButton,
@@ -86,6 +87,7 @@ impl ProfileScene {
             icon_user,
 
             btn_back: RectButton::new(),
+            btn_name: RectButton::new(),
             btn_open_web: DRectButton::new(),
             btn_logout: DRectButton::new(),
             btn_delete: DRectButton::new(),
@@ -260,6 +262,13 @@ impl Scene for ProfileScene {
             self.sf.next(t, NextScene::Pop);
             return Ok(true);
         }
+        if self.btn_name.touch(touch) {
+            if let Some(user) = &self.user {
+                unsafe { get_internal_gl() }.quad_context.clipboard_set(&user.name);
+                show_message(tl!("name-copied")).ok();
+            }
+            return Ok(true);
+        }
         if self.btn_open_web.touch(touch, t) {
             open_url(&format!("https://phira.moe/user/{}", self.id))?;
             return Ok(true);
@@ -346,6 +355,14 @@ impl Scene for ProfileScene {
                         .max_width(mw)
                         .color(user.name_color())
                         .draw();
+                    self.btn_name.set(ui, r);
+                    let r = ui
+                        .text(format!("#{}", self.id))
+                        .size(0.35)
+                        .pos(cx, r.bottom() + 0.01)
+                        .anchor(0.5, 0.)
+                        .color(semi_white(0.5))
+                        .draw();
                     let r = ui
                         .text(format!("RKS {:.2}", user.rks))
                         .size(0.5)