feat(core/bootloader): use "Initiate connection" button label on all Core devices

Changes the bootloader intro screen button label from "INSTALL FIRMWARE"/"INSTALL FW" to
"Initiate connection" for T2T1 (Model T), T3T1 (Safe 5), and T3B1 (Safe 3) to match the
label already used on T3W1 (Safe 7).

Agent-Logs-Url: https://github.com/trezor/trezor-firmware/sessions/2790c750-1c65-4734-8c78-9474a26af323

Co-authored-by: Hannsek <57008159+Hannsek@users.noreply.github.com>

Author: Copilot

core/embed/rust/src/ui/layout_bolt/bootloader/intro.rs

@@ -42,7 +42,7 @@ impl<'a> Intro<'a> {
             menu: Button::with_icon(Icon::new(MENU32))
                 .styled(button_bld_menu())
                 .with_expanded_touch_area(Insets::uniform(13)),
-            host: Button::with_text("INSTALL FIRMWARE".into()).styled(button_bld()),
+            host: Button::with_text("Initiate connection".into()).styled(button_bld()),
             text: Label::left_aligned(content, TEXT_NORMAL).vertically_centered(),
             warn: (!fw_ok).then_some(
                 Label::new("FIRMWARE CORRUPTED".into(), Alignment::Start, TEXT_WARNING)

core/embed/rust/src/ui/layout_caesar/bootloader/intro.rs

@@ -17,7 +17,7 @@ use super::super::{
     },
 };
 
-const LEFT_BUTTON_TEXT: &str = "INSTALL FW";
+const LEFT_BUTTON_TEXT: &str = "Initiate connection";
 const RIGHT_BUTTON_TEXT: &str = "MENU";
 
 #[repr(u32)]

core/embed/rust/src/ui/layout_delizia/bootloader/intro.rs

@@ -45,7 +45,7 @@ impl<'a> Intro<'a> {
                     .with_expanded_touch_area(Insets::uniform(13)),
             ),
             host: Child::new(
-                Button::with_text("INSTALL FIRMWARE".into())
+                Button::with_text("Initiate connection".into())
                     .styled(button_bld())
                     .with_text_align(Alignment::Center),
             ),