[ai] Improve lang-phrase code style.

AGENTS.md

@@ -336,15 +336,25 @@ auto filesTextProducer = tr::lng_files_selected(
 - Placeholders use `lt_tag_name, value` pattern
 - For `{count}`: immediate uses `int`, reactive uses `rpl::producer<float64>` with `| tr::to_count()`
 - Move producers with `std::move` when passing to placeholders
-- Rich text projectors — pass as the last argument to produce `TextWithEntities` instead of `QString`. These are smart objects with multiple `operator()` overloads:
+- Rich text projectors — these `tr::` helpers serve double duty: as the **last argument** (projector) they set the return type to `TextWithEntities`, and as **placeholder values** they wrap individual substitutions in formatting. Always prefer them over `Ui::Text::Bold()`, `Ui::Text::RichLangValue`, etc. — see REVIEW.md for the full mapping.
   - `tr::marked` — basic projection, converts `QString` to `TextWithEntities`
   - `tr::rich` — interprets `**bold**`/`__italic__` markup in the string
   - `tr::bold`, `tr::italic`, `tr::underline` — wrap text in that formatting
   - `tr::link` — wrap as a clickable link
   - `tr::url(u"https://..."_q)` — returns a projection that converts text to a link pointing to the given URL; can be passed to `rpl::map` or directly to a `tr::lng_...` call
   ```cpp
+  // As last argument (projector):
   auto title = tr::lng_export_progress_title(tr::now, tr::bold);
   auto text = tr::lng_proxy_incorrect_secret(tr::now, tr::rich);
+  // As placeholder value wrapper + projector:
+  auto desc = tr::lng_some_key(
+      tr::now,
+      lt_name,
+      tr::bold(userName),
+      lt_group,
+      tr::bold(groupName),
+      tr::rich);
+  // Nested tr::lng as placeholder:
   auto linked = tr::lng_settings_birthday_contacts(
       lt_link,
       tr::lng_settings_birthday_contacts_link(tr::url(link)),

REVIEW.md

@@ -114,6 +114,62 @@ bool _expanded = false;
 SomeType *_pointer = nullptr;
 ```
 
+## Prefer tr:: projections over Ui::Text:: in localization calls
+
+Inside `tr::lng_...()` calls, always use the `tr::` projection helpers instead of their `Ui::Text::` equivalents. The `tr::` helpers are shorter and work uniformly as both placeholder wrappers and final projectors.
+
+| Instead of | Use |
+|---|---|
+| `Ui::Text::Bold(x)` | `tr::bold(x)` |
+| `Ui::Text::Italic(x)` | `tr::italic(x)` |
+| `Ui::Text::RichLangValue` | `tr::rich` |
+| `Ui::Text::WithEntities` | `tr::marked` |
+
+```cpp
+// BAD - verbose Ui::Text:: functions:
+tr::lng_some_key(
+    tr::now,
+    lt_name,
+    Ui::Text::Bold(name),
+    lt_group,
+    Ui::Text::Bold(group),
+    Ui::Text::RichLangValue)
+
+// GOOD - concise tr:: helpers:
+tr::lng_some_key(
+    tr::now,
+    lt_name,
+    tr::bold(name),
+    lt_group,
+    tr::bold(group),
+    tr::rich)
+```
+
+## Multi-line calls — one argument per line
+
+When a function call doesn't fit on one line, put each argument on its own line. Don't group "logical pairs" on the same line — it creates inconsistent line lengths and makes diffs noisier.
+
+```cpp
+// BAD - pairs of arguments sharing lines:
+tr::lng_some_key(
+    tr::now,
+    lt_name, tr::bold(name),
+    lt_group, tr::bold(group),
+    tr::rich)
+
+// GOOD - one argument per line:
+tr::lng_some_key(
+    tr::now,
+    lt_name,
+    tr::bold(name),
+    lt_group,
+    tr::bold(group),
+    tr::rich)
+
+// Single-line is fine when everything fits:
+auto text = tr::lng_settings_title(tr::now);
+```
+
 ## std::optional access — avoid value()
 
 Do not call `std::optional::value()` because it throws an exception that is not available on older macOS targets. Use `has_value()`, `value_or()`, `operator bool()`, or `operator*` instead.