build: migrate to tui-realm 4.0

Upgrade tuirealm (3.x -> 4.0.0), tui-realm-stdlib (3 -> 4), tui-term
(0.2 -> 0.3). Apply all breaking changes from the 4.0 migration guide
across the termscp UI.

Key changes:

- Root-level re-exports removed; imports moved to module-qualified
  paths (`tuirealm::application`, `::component`, `::event`, `::props`,
  `::state`, `::subscription`, `::listener`, `::ratatui`). Same for
  stdlib component types (`tui_realm_stdlib::components::*`).
- `MockComponent` trait renamed to `Component`; old `Component` trait
  renamed to `AppComponent`. `#[derive(MockComponent)]` is now
  `#[derive(Component)]`. `Component::on` now takes `&Event<_>`.
- `TextSpan` replaced with `SpanStatic`/`LineStatic`/`TextStatic`
  (ratatui-based); tuple `(String, Alignment)` titles replaced with
  the new `Title` builder; `Alignment` split into
  `HorizontalAlignment`/`VerticalAlignment`; stdlib components use
  `.alignment_horizontal` instead of `.alignment`.
- `State::One`/`PropPayload::One` -> `Single`. `CmdResult::None`
  -> `NoChange`. `Props::get_or` removed; `Props::get` now returns a
  borrowed `Option<&AttrValue>` (call sites switched to
  `.and_then(AttrValue::as_*)`). `Component::query` returns
  `Option<QueryResult<'a>>`.
- `Attribute::HighlightedColor` -> `HighlightStyle` (a full `Style`).
  `.highlighted_*` helpers renamed to `.highlight_*`.
- `PollStrategy::UpTo(n)` now requires a `Duration`; tick timeout moved
  from `EventListenerCfg::poll_timeout` into `PollStrategy`.
- `TerminalBridge` removed; `Context` now holds
  `CrosstermTerminalAdapter` directly and enables raw mode + alternate
  screen explicitly. The `TerminalAdapter` trait is imported where its
  methods are used.
- `Update` trait removed; activity `update` methods are plain inherent
  functions.
- `ProgressBar` replaced by stdlib `Gauge`. Paragraph `.wrap` renamed
  to `.wrap_trim`; `.text` now takes an `Into<Text>`. Stdlib `List` row
  items are now individual lines (`Vec<Span>` per row) rather than a
  `Table` of spans; custom `FileList`/`Log` convert between the two
  models.
- Radio builders drop `.foreground(color)` so unselected items render
  with the terminal default foreground, and set
  `highlight_style(Style::default().fg(color).add_modifier(REVERSED))`
  so the selected entry is visibly highlighted only with the theme
  color.
- Custom `FileList` keeps the selected row highlighted with the full
  highlight style when focused and falls back to a foreground-only
  style when unfocused.
- Theme loading is now backwards compatible: `Theme` uses a custom
  `Deserialize` through an intermediate `ThemeFile` with optional
  fields, so missing keys, unknown values or legacy aliases
  (`transfer_progress_bar_full`/`_partial`) fall back to defaults on a
  per-field basis instead of failing the whole load.

src/ui/activities/filetransfer/components/popups/delete.rs

@@ -1,12 +1,15 @@
-use tui_realm_stdlib::Radio;
+use tui_realm_stdlib::components::Radio;
 use tuirealm::command::{Cmd, CmdResult, Direction};
-use tuirealm::event::{Key, KeyEvent, KeyModifiers};
-use tuirealm::props::{Alignment, BorderType, Borders, Color};
-use tuirealm::{Component, Event, MockComponent, NoUserEvent, State, StateValue};
+use tuirealm::component::{AppComponent, Component};
+use tuirealm::event::{Event, Key, KeyEvent, KeyModifiers, NoUserEvent};
+use tuirealm::props::{
+    BorderType, Borders, Color, HorizontalAlignment, Style, TextModifiers, Title,
+};
+use tuirealm::state::{State, StateValue};
 
 use crate::ui::activities::filetransfer::{Msg, TransferMsg, UiMsg};
 
-#[derive(MockComponent)]
+#[derive(Component)]
 pub struct DeletePopup {
     component: Radio,
 }
@@ -15,21 +18,25 @@ impl DeletePopup {
     pub fn new(color: Color) -> Self {
         Self {
             component: Radio::default()
+                .highlight_style(
+                    Style::default()
+                        .fg(color)
+                        .add_modifier(TextModifiers::REVERSED),
+                )
                 .borders(
                     Borders::default()
                         .color(color)
                         .modifiers(BorderType::Rounded),
                 )
-                .foreground(color)
                 .choices(["Yes", "No"])
                 .value(1)
-                .title("Delete file(s)?", Alignment::Center),
+                .title(Title::from("Delete file(s)?").alignment(HorizontalAlignment::Center)),
         }
     }
 }
 
-impl Component<Msg, NoUserEvent> for DeletePopup {
-    fn on(&mut self, ev: Event<NoUserEvent>) -> Option<Msg> {
+impl AppComponent<Msg, NoUserEvent> for DeletePopup {
+    fn on(&mut self, ev: &Event<NoUserEvent>) -> Option<Msg> {
         match ev {
             Event::Keyboard(KeyEvent {
                 code: Key::Left, ..
@@ -59,7 +66,7 @@ impl Component<Msg, NoUserEvent> for DeletePopup {
             }) => {
                 if matches!(
                     self.perform(Cmd::Submit),
-                    CmdResult::Submit(State::One(StateValue::Usize(0)))
+                    CmdResult::Submit(State::Single(StateValue::Usize(0)))
                 ) {
                     Some(Msg::Transfer(TransferMsg::DeleteFile))
                 } else {