Preserve hyperlink entities during alternative translations

[Rocket-Space]

Motivation

• Ensure that hyperlinks and link-like MessageEntity objects remain clickable and correctly positioned when using alternative translation providers that return plain text.
• Avoid losing link semantics when the translator reorders or alters sentence structure by masking/restoring links around translation.

Description

• Added alternativeTranslateWithEntities in TranslateAlert2 which masks link entities with placeholders, calls the alternative translator, and restores both visible text and MessageEntity instances into the translated result using preprocess.
• Implemented helper types and functions: PlaceholderLink, isLinkEntity, and cloneLinkEntity to manage masking and recreation of link entities in the target text.
• Updated translateAlt() in TranslateAlert2 to use the new entity-preserving flow and to build a Spannable via MessageObject.addEntitiesToText(...) so links remain interactive in the UI.
• Updated TranslateController batching/fallback paths to call TranslateAlert2.alternativeTranslateWithEntities(...) for provider-based translations and removed an unused import (SpaceGramTranslator) from TranslateController.

Testing

• Attempted a local Java build with ./gradlew -q :TMessagesProj:compileDebugJavaWithJavac, but it failed due to an environment JDK/Gradle mismatch (Unsupported class file major version 69), so full compile-time verification could not be completed here.
• Performed static code edits and committed the changes (git commit completed) and created the PR; no unit/integration tests were run in this environment due to the build failure.

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[chatgpt-codex-connector]

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