chore: rename H7CAD to Open CAD Studio

Joining the OpenAEC Foundation (open-aec.com). Crate/struct become
OpenCADStudio, user-facing strings use the spaced "Open CAD Studio"
form, repo URLs point to HakanSeven12/open-cad-studio. Logo (window
icon + assets/logo.svg) redrawn with OCS initials. Drop examples/
binaries — unused.

Co-Authored-By: Claude Opus 4.7 <[email protected]>

src/ui/about.rs

@@ -57,7 +57,7 @@ pub fn view_window<'a>() -> Element<'a, Message> {
 
     let logo = container(
         column![
-            text("H7CAD").size(32).color(ACCENT),
+            text("Open CAD Studio").size(32).color(ACCENT),
             text("CAD application for Architecture & Engineering")
                 .size(11)
                 .color(DIM),

src/ui/app_menu.rs

@@ -1,4 +1,4 @@
-//! Application menu — H7CAD-style dropdown that opens when the H7 logo
+//! Application menu — OpenCADStudio-style dropdown that opens when the OCS logo
 //! button is clicked. Overlays the entire viewport as a floating panel.
 //!
 //! Layout:
@@ -235,7 +235,7 @@ impl AppMenu {
         let bottom = container(
             row![
                 iced::widget::Space::new().width(Length::Fill),
-                button(text("Exit H7CAD").size(11).color(Color::WHITE))
+                button(text("Exit Open CAD Studio").size(11).color(Color::WHITE))
                     .on_press(Message::Command("EXIT".into()))
                     .style(|_: &Theme, status| button::Style {
                         background: Some(Background::Color(match status {
@@ -299,7 +299,7 @@ impl AppMenu {
         // Backdrop — clicking outside closes the menu.
         let backdrop = button(
             container(panel)
-                // Offset so the panel sits just below the ribbon H7 button.
+                // Offset so the panel sits just below the ribbon OCS button.
                 .padding(iced::Padding {
                     top: 56.0,
                     left: 0.0,
@@ -521,7 +521,7 @@ fn recents_file_path() -> Option<PathBuf> {
         p
     };
     let mut p = base;
-    p.push("H7CAD");
+    p.push("OpenCADStudio");
     Some(p.join("recent.txt"))
 }
 

src/ui/command_line.rs

@@ -1,4 +1,4 @@
-//! H7CAD-style command line — bottom panel with input and history
+//! OpenCADStudio-style command line — bottom panel with input and history
 
 use crate::app::Message;
 use iced::widget::{column, container, row, text, text_input};
@@ -41,7 +41,7 @@ pub enum EntryKind {
 impl CommandLine {
     pub fn new() -> Self {
         let mut cl = Self::default();
-        cl.push_info("H7CAD ready.");
+        cl.push_info("Open CAD Studio ready.");
         cl.push_info("Type a command or use the ribbon. Open OBJ: INSERT tab.");
         cl
     }

src/ui/properties.rs

@@ -1,4 +1,4 @@
-//! Properties panel — H7CAD-style editable object properties.
+//! Properties panel — OpenCADStudio-style editable object properties.
 //!
 //! Shows two sections (General + Geometry) for the selected entity.
 //! • Layer      → combo_box  (options from document layer table)

src/ui/snap_popup.rs

@@ -1,4 +1,4 @@
-//! H7CAD-style OSNAP dropdown popup panel.
+//! OpenCADStudio-style OSNAP dropdown popup panel.
 //!
 //! Rendered as a floating overlay above the status bar.  The popup is only
 //! inserted into the view stack when `snap_popup_open` is true.

src/ui/update_notice.rs

@@ -140,7 +140,7 @@ pub fn view_window<'a>(latest: &'a str, body: &'a str) -> Element<'a, Message> {
     let header = container(
         column![
             text("New Release Available").size(20).color(ACCENT),
-            text("A newer H7CAD version is published on GitHub.")
+            text("A newer Open CAD Studio version is published on GitHub.")
                 .size(11)
                 .color(DIM),
         ]