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/locale_catalog.rs

@@ -481,6 +481,7 @@ pub(super) fn message_attribute(source: &str) -> Option<(&'static str, &'static
         "Bring to Front" => Some(("ui", "bring-to-front")),
         "Browse, install, and manage add-ons. Select one to view its README." => Some(("plugins", "browse-install-and-manage-add-ons-select-one-t")),
         "Browser storage" => Some(("options", "browser-storage")),
+        "Build" => Some(("ui", "build")),
         "Building scene caches…" => Some(("ui", "building-scene-caches")),
         "Bump Map" => Some(("properties", "bump-map")),
         "By annotation scale" => Some(("styles", "by-annotation-scale")),
@@ -645,6 +646,7 @@ pub(super) fn message_attribute(source: &str) -> Option<(&'static str, &'static
         "Command Aliases" => Some(("command", "command-aliases")),
         "Command cancelled because the active drawing space changed." => Some(("common", "command-cancelled-because-the-active-drawing-s")),
         "Command history navigation" => Some(("common", "command-history-navigation")),
+        "Commit date" => Some(("ui", "commit-date")),
         "Command:" => Some(("common", "command-label-title-case")),
         "Commands:  %{cmds}" => Some(("plugins", "commands-cmds")),
         "Compact" => Some(("ui", "compact")),
@@ -2234,6 +2236,7 @@ pub(super) fn message_attribute(source: &str) -> Option<(&'static str, &'static
         "Refraction Map" => Some(("properties", "refraction-map")),
         "Region" => Some(("properties", "region")),
         "Registered Class Entity" => Some(("properties", "registered-class-entity")),
+        "Release" => Some(("ui", "release")),
         "Reload failed: {error}" => Some(("file", "reload-failed-error")),
         "Reload from Disk" => Some(("modal", "reload-from-disk")),
         "Remote Text" => Some(("properties", "remote-text")),