Show the exact build in About, Copy Info, REPORT and --version

Builds from main reported only the release version (2026.36) even when
HEAD was hundreds of commits past the tag. build.rs now also emits
OCS_TAG_DISTANCE, OCS_COMMIT_DATE, OCS_BUILD_METADATA and
OCS_FULL_VERSION: a clean checkout of the release tag stays "2026.36",
anything else becomes "2026.36+194.gef189d77", with ".dirty" appended
for uncommitted changes and only the hash when no tag can be counted
from (shallow clone, tarball). OCS_APP_VERSION is unchanged so the
update check, donation gate, User-Agents and window title keep working.

The About dialog gains Build / Commit date / Profile cards, Copy Info,
the REPORT issue template and recovery reports carry the full version,
and `-V`/`--version` print it instead of Cargo's 2026.36.0. Release
workflows check out full history so release binaries see the tag.

Also fixes the build being marked dirty when there is no repository:
diff-index exits 128 there, not 1.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/app/commands/view.rs

@@ -262,8 +262,11 @@ impl OpenCADStudio {
                 // reports arrive with the basics already filled in.
                 let body = format!(
                     "<!-- Describe the issue and the steps to reproduce it. -->\n\n\n\
-                     ---\n- Open CAD Studio: v{}\n- Platform: {}\n",
-                    env!("OCS_APP_VERSION"),
+                     ---\n- Open CAD Studio: v{}\n- Revision: {} ({}, {})\n- Platform: {}\n",
+                    env!("OCS_FULL_VERSION"),
+                    env!("OCS_GIT_REV"),
+                    env!("OCS_COMMIT_DATE"),
+                    env!("OCS_BUILD_PROFILE"),
                     crate::sys::platform_info(),
                 );
                 let url = format!(

src/app/update/mod.rs

@@ -6949,8 +6949,12 @@ impl OpenCADStudio {
 
             Message::AboutCopyInfo => {
                 let info = format!(
-                    "Open CAD Studio v{}\nOS: {}\nArch: {}",
-                    env!("OCS_APP_VERSION"),
+                    "Open CAD Studio v{}\nRevision: {}\nCommit date: {}\nProfile: {}\nFeatures: {}\nOS: {}\nArch: {}",
+                    env!("OCS_FULL_VERSION"),
+                    env!("OCS_GIT_REV"),
+                    env!("OCS_COMMIT_DATE"),
+                    env!("OCS_BUILD_PROFILE"),
+                    env!("OCS_BUILD_FEATURES"),
                     crate::ui::window::about::platform_name(),
                     crate::ui::window::about::architecture_name(),
                 );
@@ -7168,7 +7172,7 @@ impl OpenCADStudio {
                 if let Some(error) = &self.plugin_registry_error {
                     return iced::clipboard::write(format!(
                         "Open CAD Studio v{}\nOS: {}\nArchitecture: {}\nRegistry: {}\nError: {}",
-                        env!("OCS_APP_VERSION"),
+                        env!("OCS_FULL_VERSION"),
                         std::env::consts::OS,
                         std::env::consts::ARCH,
                         crate::plugin::marketplace::REGISTRY_URL,