Fix double-scaling by locking page layout to logical presentation

Pages computed layout from SDL_GetWindowSize() (real window
coordinates) while SDL_SetRenderLogicalPresentation() independently
remapped every draw call into a 1920x1080 space. The two coordinate
systems only agreed when the window happened to be exactly 1920x1080;
at any other size, layout coordinates were transformed a second time,
so content shrank/grew quadratically toward the top-left on resize or
on non-1080p monitors. Commenting the call out masked the bug by
making rendering 1:1 with the window, but then nothing scaled: fonts
and margins stayed fixed-pixel while backgrounds cover-fit, and HiDPI
displays drew at point resolution and relied on blurry compositor
upsampling.

Restore SDL_SetRenderLogicalPresentation(1920x1080, LETTERBOX) as the
single source of scaling, and route all twelve layout sites through a
new radiantwave::getLayoutSize() helper (src/logical_size.h) that
returns the renderer's logical size, so pages always lay out against
the design resolution regardless of window or monitor geometry. Add
SDL_WINDOW_HIGH_PIXEL_DENSITY so HiDPI displays render at native pixel
density instead of being upscaled by the OS. Cached per-page textures
become resolution-independent since layout no longer depends on window
size.

src/audio_settings_page.cpp

@@ -1,5 +1,6 @@
 #include "audio_settings_page.h"
 #include "app_state.h"
+#include "logical_size.h"
 #include <SDL3/SDL.h>
 #include <algorithm>
 #include <cctype>
@@ -477,7 +478,7 @@ void AudioSettingsPage::renderModal(SDL_Renderer* renderer, float fw, float fh,
 
 void AudioSettingsPage::render(SDL_Renderer* renderer) {
     int winW, winH;
-    SDL_GetWindowSize(SDL_GetRenderWindow(renderer), &winW, &winH);
+    radiantwave::getLayoutSize(renderer, &winW, &winH);
     float fw = static_cast<float>(winW);
     float fh = static_cast<float>(winH);
 

src/date_format_page.cpp

@@ -1,6 +1,7 @@
 #include "date_format_page.h"
 #include "app_state.h"
 #include "date_format.h"
+#include "logical_size.h"
 #include <SDL3/SDL.h>
 #include <algorithm>
 #include <ctime>
@@ -131,7 +132,7 @@ void DateFormatPage::update(float dt)
 void DateFormatPage::render(SDL_Renderer* renderer)
 {
     int winW, winH;
-    SDL_GetWindowSize(SDL_GetRenderWindow(renderer), &winW, &winH);
+    radiantwave::getLayoutSize(renderer, &winW, &winH);
     float fw = static_cast<float>(winW);
     float fh = static_cast<float>(winH);
 

src/email_address_page.cpp

@@ -3,6 +3,7 @@
 #include "db/db_keys.h"
 #include "provisioning.h"
 #include "validation.h"
+#include "logical_size.h"
 #include <SDL3/SDL.h>
 
 namespace {
@@ -164,7 +165,7 @@ void EmailAddressPage::exitPage(AppState& state)
 void EmailAddressPage::render(SDL_Renderer* renderer)
 {
     int winW, winH;
-    SDL_GetWindowSize(SDL_GetRenderWindow(renderer), &winW, &winH);
+    radiantwave::getLayoutSize(renderer, &winW, &winH);
     float fw = static_cast<float>(winW);
     float fh = static_cast<float>(winH);
 

src/home.cpp

@@ -8,6 +8,7 @@
 #include "audio/audio_downloader.h"
 #include "db/db_keys.h"
 #include "network/proclamation_sync.h"
+#include "logical_size.h"
 #include <SDL3/SDL.h>
 #include <SDL3_image/SDL_image.h>
 #include <ctime>
@@ -114,7 +115,7 @@ void Home::update(float dt)
 void Home::render(SDL_Renderer *renderer)
 {
     int winW, winH;
-    SDL_GetWindowSize(SDL_GetRenderWindow(renderer), &winW, &winH);
+    radiantwave::getLayoutSize(renderer, &winW, &winH);
     float fw = static_cast<float>(winW);
     float fh = static_cast<float>(winH);
 

src/license_blocked_page.cpp

@@ -1,6 +1,7 @@
 #include "license_blocked_page.h"
 #include "app_state.h"
 #include "home.h"
+#include "logical_size.h"
 #include <SDL3/SDL.h>
 
 void LicenseBlockedPage::onPush(AppState& state)
@@ -71,7 +72,7 @@ void LicenseBlockedPage::update(float dt)
 void LicenseBlockedPage::render(SDL_Renderer* renderer)
 {
     int winW, winH;
-    SDL_GetWindowSize(SDL_GetRenderWindow(renderer), &winW, &winH);
+    radiantwave::getLayoutSize(renderer, &winW, &winH);
     float fw = static_cast<float>(winW);
     float fh = static_cast<float>(winH);
 

src/license_key_page.cpp

@@ -4,6 +4,7 @@
 #include "network/license_service.h"
 #include "provisioning.h"
 #include "validation.h"
+#include "logical_size.h"
 #include <SDL3/SDL.h>
 
 void LicenseKeyPage::onPush(AppState& state)
@@ -172,7 +173,7 @@ void LicenseKeyPage::exitPage(AppState& state)
 void LicenseKeyPage::render(SDL_Renderer* renderer)
 {
     int winW, winH;
-    SDL_GetWindowSize(SDL_GetRenderWindow(renderer), &winW, &winH);
+    radiantwave::getLayoutSize(renderer, &winW, &winH);
     float fw = static_cast<float>(winW);
     float fh = static_cast<float>(winH);
 

src/log_viewer_page.cpp

@@ -1,6 +1,7 @@
 #include "log_viewer_page.h"
 #include "app_state.h"
 #include "timezone_helper.h"
+#include "logical_size.h"
 #include <SDL3/SDL.h>
 #include <algorithm>
 #include <sstream>
@@ -162,7 +163,7 @@ void LogViewerPage::update(float dt) {
 
 void LogViewerPage::render(SDL_Renderer* renderer) {
     int winW, winH;
-    SDL_GetWindowSize(SDL_GetRenderWindow(renderer), &winW, &winH);
+    radiantwave::getLayoutSize(renderer, &winW, &winH);
     float fw = static_cast<float>(winW);
     float fh = static_cast<float>(winH);
 

src/logical_size.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <SDL3/SDL.h>
+
+namespace radiantwave {
+
+inline void getLayoutSize(SDL_Renderer* renderer, int* w, int* h)
+{
+    SDL_RendererLogicalPresentation mode = SDL_LOGICAL_PRESENTATION_DISABLED;
+    if (!SDL_GetRenderLogicalPresentation(renderer, w, h, &mode) ||
+        mode == SDL_LOGICAL_PRESENTATION_DISABLED || *w <= 0 || *h <= 0)
+    {
+        SDL_GetWindowSize(SDL_GetRenderWindow(renderer), w, h);
+    }
+}
+
+} // namespace radiantwave

src/main.cpp

@@ -62,12 +62,12 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[]) {
 	// Lock the renderer to a 1920x1080 logical coordinate space.  All page
 	// layout code already targets this resolution, so everything renders at
 	// the correct size on any display — the GPU scales to native pixels.
-	// if (!SDL_SetRenderLogicalPresentation(state->renderer, 1920, 1080,
+	if (!SDL_SetRenderLogicalPresentation(state->renderer, 1920, 1080,
-	// SDL_LOGICAL_PRESENTATION_STRETCH)) {
+										  SDL_LOGICAL_PRESENTATION_STRETCH)) {
-	//     radiantwave::logger::Logger::instance().warning("Graphics",
+		radiantwave::logger::Logger::instance().warning(
-	//         "Could not set logical render size; layout may be wrong on HiDPI
+			"Graphics", "Could not set logical render size; layout may be "
-	//         displays");
+						"wrong on HiDPI displays");
-	// }
+	}
 
 	SDL_HideCursor();
 

src/proclamation_options_page.cpp

@@ -1,6 +1,7 @@
 #include "proclamation_options_page.h"
 #include "app_state.h"
 #include "network/proclamation_sync.h"
+#include "logical_size.h"
 #include <SDL3/SDL.h>
 #include <algorithm>
 #include <cctype>
@@ -552,7 +553,7 @@ void ProclamationOptionsPage::update(float dt)
 void ProclamationOptionsPage::render(SDL_Renderer* renderer)
 {
     int winW, winH;
-    SDL_GetWindowSize(SDL_GetRenderWindow(renderer), &winW, &winH);
+    radiantwave::getLayoutSize(renderer, &winW, &winH);
     float fw = static_cast<float>(winW);
     float fh = static_cast<float>(winH);
 

src/scroller_page.cpp

@@ -5,6 +5,7 @@
 #include "proclamation_options_page.h"
 #include "scramble/fibonacci_scrambler.h"
 #include "utf8_utils.h"
+#include "logical_size.h"
 
 #include <SDL3/SDL.h>
 #include <SDL3_ttf/SDL_ttf.h>
@@ -35,7 +36,7 @@ void ScrollerPage::onPush(AppState &state)
 
     int winW = 0;
     int winH = 0;
-    SDL_GetWindowSize(state.window, &winW, &winH);
+    radiantwave::getLayoutSize(state.renderer, &winW, &winH);
     screenW_ = static_cast<float>(winW);
     screenH_ = static_cast<float>(winH);
     // Lines are capped at the full screen width; the widest Fibonacci lines are

src/settings.cpp

@@ -10,6 +10,7 @@
 #include "email_address_page.h"
 #include "license_key_page.h"
 #include "date_format_page.h"
+#include "logical_size.h"
 #include <SDL3/SDL.h>
 #include <SDL3_image/SDL_image.h>
 #include <algorithm>
@@ -128,7 +129,7 @@ void Settings::update(float dt)
 void Settings::render(SDL_Renderer *renderer)
 {
     int winW, winH;
-    SDL_GetWindowSize(SDL_GetRenderWindow(renderer), &winW, &winH);
+    radiantwave::getLayoutSize(renderer, &winW, &winH);
     float fw = static_cast<float>(winW);
     float fh = static_cast<float>(winH);
 

src/timezone_page.cpp

@@ -1,5 +1,6 @@
 #include "timezone_page.h"
 #include "app_state.h"
+#include "logical_size.h"
 #include <SDL3/SDL.h>
 #include <algorithm>
 #include <ctime>
@@ -199,7 +200,7 @@ void TimeZonePage::update(float dt) {
 
 void TimeZonePage::render(SDL_Renderer* renderer) {
     int winW, winH;
-    SDL_GetWindowSize(SDL_GetRenderWindow(renderer), &winW, &winH);
+    radiantwave::getLayoutSize(renderer, &winW, &winH);
     float fw = static_cast<float>(winW);
     float fh = static_cast<float>(winH);
 

src/wifi_setup_page.cpp

@@ -1,6 +1,7 @@
 #include "wifi_setup_page.h"
 #include "app_state.h"
 #include "provisioning.h"
+#include "logical_size.h"
 #include <SDL3/SDL.h>
 #include <algorithm>
 #include <exception>
@@ -301,7 +302,7 @@ void WiFiSetupPage::update(float dt) {
 
 void WiFiSetupPage::render(SDL_Renderer* renderer) {
     int winW, winH;
-    SDL_GetWindowSize(SDL_GetRenderWindow(renderer), &winW, &winH);
+    radiantwave::getLayoutSize(renderer, &winW, &winH);
     float fw = static_cast<float>(winW);
     float fh = static_cast<float>(winH);