Fix Cursor rules files.

.cursor/rules/api_usage.mdc

@@ -1,8 +1,13 @@
+---
+description: For tasks requiring sending Telegram server API requests or working with generated API types.
+globs:
+alwaysApply: false
+---
 # Telegram Desktop API Usage
 
 ## API Schema
 
-The API definitions are described using [TL Language](https://core.telegram.org/mtproto/TL) in two main schema files:
+The API definitions are described using [TL Language]\(https:/core.telegram.org/mtproto/TL) in two main schema files:
 
 1.  **`Telegram/SourceFiles/mtproto/scheme/mtproto.tl`**
     *   Defines the core MTProto protocol types and methods used for basic communication, encryption, authorization, service messages, etc.
@@ -39,7 +44,7 @@ api().request(MTPnamespace_MethodName(
     MTP_long(randomId),
     // ... other arguments matching the TL definition
     MTP_vector<MTPMessageEntity>() // Example for a vector argument
-)).done([=](const MTPResponseType &result) {
+)).done([=]\(const MTPResponseType &result) {
     // Handle the successful response (result).
     // 'result' will be of the C++ type corresponding to the TL type
     // specified after the '=' in the api.tl method definition.
@@ -47,9 +52,9 @@ api().request(MTPnamespace_MethodName(
 
     // 1. Multiple Constructors (e.g., User = User | UserEmpty):
     //    Use .match() with lambdas for each constructor:
-    result.match([&](const MTPDuser &data) {
+    result.match([&]\(const MTPDuser &data) {
         /* use data.vfirst_name().v, etc. */
-    }, [&](const MTPDuserEmpty &data) {
+    }, [&]\(const MTPDuserEmpty &data) {
         /* handle empty user */
     });
 
@@ -64,7 +69,7 @@ api().request(MTPnamespace_MethodName(
 
     // 2. Single Constructor (e.g., Messages = messages { msgs: vector<Message> }):
     //    Use .match() with a single lambda:
-    result.match([&](const MTPDmessages &data) { /* use data.vmessages().v */ });
+    result.match([&]\(const MTPDmessages &data) { /* use data.vmessages().v */ });
 
     //    Or check the type explicitly and use the constructor getter:
     if (result.type() == mtpc_messages) {
@@ -76,7 +81,7 @@ api().request(MTPnamespace_MethodName(
     const auto &data = result.data(); // Only works for single-constructor types!
     // use data.vmessages().v
 
-}).fail([=](const MTP::Error &error) {
+}).fail([=]\(const MTP::Error &error) {
     // Handle the API error (error).
     // 'error' is an MTP::Error object containing the error code (error.type())
     // and description (error.description()). Check for specific error strings.
@@ -93,8 +98,8 @@ api().request(MTPnamespace_MethodName(
 *   Always refer to `Telegram/SourceFiles/mtproto/scheme/api.tl` for the correct method names, parameters (names and types), and response types.
 *   Use the generated `MTP...` types/classes for request parameters (e.g., `MTP_int`, `MTP_string`, `MTP_bool`, `MTP_vector`, `MTPInputUser`, etc.) and response handling.
 *   The `.done()` lambda receives the specific C++ `MTP...` type corresponding to the TL return type.
-    *   For types with **multiple constructors** (e.g., `User = User | UserEmpty`), use `result.match([&](const MTPDuser &d){ ... }, [&](const MTPDuserEmpty &d){ ... })` to handle each case, or check `result.type() == mtpc_user` / `mtpc_userEmpty` and call the specific `result.c_user()` / `result.c_userEmpty()` getter (which asserts on type mismatch).
-    *   For types with a **single constructor** (e.g., `Messages = messages{...}`), you can use `result.match([&](const MTPDmessages &d){ ... })` with one lambda, or check `type()` and call `c_messages()`, or use the shortcut `result.data()` to access the fields directly.
+    *   For types with **multiple constructors** (e.g., `User = User | UserEmpty`), use `result.match([&]\(const MTPDuser &d){ ... }, [&]\(const MTPDuserEmpty &d){ ... })` to handle each case, or check `result.type() == mtpc_user` / `mtpc_userEmpty` and call the specific `result.c_user()` / `result.c_userEmpty()` getter (which asserts on type mismatch).
+    *   For types with a **single constructor** (e.g., `Messages = messages{...}`), you can use `result.match([&]\(const MTPDmessages &d){ ... })` with one lambda, or check `type()` and call `c_messages()`, or use the shortcut `result.data()` to access the fields directly.
 *   The `.fail()` lambda receives an `MTP::Error` object. Check `error.type()` against known error strings (often defined as constants or using `u"..."_q` literals).
 *   Directly construct the `MTPnamespace_MethodName(...)` object inside `request()`.
-*   Include `.handleFloodErrors()` before `.send()` for standard flood wait handling.
+*   Include `.handleFloodErrors()` before `.send()` for standard flood wait handling.

.cursor/rules/localization.mdc

@@ -1,3 +1,8 @@
+---
+description: For tasks requiring changing or adding user facing phrases and text parts.
+globs:
+alwaysApply: false
+---
 # Telegram Desktop Localization
 
 ## Coding Style Note
@@ -156,4 +161,4 @@ auto messageProducer = tr::lng_user_posted_photo( // Type: rpl::producer<TextWit
     *   Immediate: Pass `int` or `float64`.
     *   Reactive: Pass `rpl::producer<float64>`, typically by converting an `int` producer using `| tr::to_count()`.
 *   Optional projector function as the last argument modifies the output type and required placeholder types.
-*   Actual translations are loaded at runtime from the API.
+*   Actual translations are loaded at runtime from the API.

.cursor/rules/rpl_guide.mdc

@@ -1,3 +1,8 @@
+---
+description:
+globs:
+alwaysApply: true
+---
 # RPL (Reactive Programming Library) Guide
 
 ## Coding Style Note
@@ -64,7 +69,7 @@ rpl::lifetime lifetime;
 // Counter is consumed here, use std::move if it's an l-value.
 std::move(
     counter
-) | rpl::start_with_next([=](int nextValue) {
+) | rpl::start_with_next([=]\(int nextValue) {
     // Process the next integer value emitted by the producer.
     qDebug() << "Received: " << nextValue;
 }, lifetime); // Pass the lifetime to manage the subscription.
@@ -77,7 +82,7 @@ std::move(
 auto counter2 = /* ... */; // Type: rpl::producer<int>
 rpl::lifetime subscriptionLifetime = std::move(
     counter2
-) | rpl::start_with_next([=](int nextValue) { /* ... */ });
+) | rpl::start_with_next([=]\(int nextValue) { /* ... */ });
 // The returned lifetime MUST be stored. If it's discarded immediately,
 // the subscription stops instantly.
 // `counter2` is also moved-from here.
@@ -93,7 +98,7 @@ rpl::lifetime lifetime;
 // If it's the only use, std::move(dataStream) would be preferred.
 rpl::duplicate(
     dataStream
-) | rpl::start_with_error([=](Error &&error) {
+) | rpl::start_with_error([=]\(Error &&error) {
     // Handle the error signaled by the producer.
     qDebug() << "Error: " << error.text();
 }, lifetime);
@@ -101,7 +106,7 @@ rpl::duplicate(
 // Using dataStream again, perhaps duplicated again or moved if last use.
 rpl::duplicate(
     dataStream
-) | rpl::start_with_done([=]() {
+) | rpl::start_with_done([=] {
     // Execute when the producer signals it's finished emitting values.
     qDebug() << "Stream finished.";
 }, lifetime);
@@ -110,9 +115,9 @@ rpl::duplicate(
 std::move(
     dataStream
 ) | rpl::start_with_next_error_done(
-    [=](QString &&value) { /* handle next value */ },
-    [=](Error &&error) { /* handle error */ },
-    [=]() { /* handle done */ },
+    [=]\(QString &&value) { /* handle next value */ },
+    [=]\(Error &&error) { /* handle error */ },
+    [=] { /* handle done */ },
     lifetime);
 ```
 
@@ -164,7 +169,7 @@ You can combine multiple producers into one:
     // The lambda receives unpacked arguments, not the tuple itself.
     std::move(
         combined
-    ) | rpl::start_with_next([=](int count, const QString &text) {
+    ) | rpl::start_with_next([=]\(int count, const QString &text) {
         // No need for std::get<0>(latest), etc.
         qDebug() << "Combined: Count=" << count << ", Text=" << text;
     }, lifetime);
@@ -172,11 +177,11 @@ You can combine multiple producers into one:
     // This also works with map, filter, etc.
     std::move(
         combined
-    ) | rpl::filter([=](int count, const QString &text) {
+    ) | rpl::filter([=]\(int count, const QString &text) {
         return count > 0 && !text.isEmpty();
-    }) | rpl::map([=](int count, const QString &text) {
+    }) | rpl::map([=]\(int count, const QString &text) {
         return text.repeated(count);
-    }) | rpl::start_with_next([=](const QString &result) {
+    }) | rpl::start_with_next([=]\(const QString &result) {
         qDebug() << "Mapped & Filtered: " << result;
     }, lifetime);
     ```
@@ -192,7 +197,7 @@ You can combine multiple producers into one:
     // Starting the merged producer consumes it.
     std::move(
         merged
-    ) | rpl::start_with_next([=](QString &&value) {
+    ) | rpl::start_with_next([=]\(QString &&value) {
         // Receives values from either sourceA or sourceB as they arrive.
         qDebug() << "Merged value: " << value;
     }, lifetime);
@@ -208,4 +213,4 @@ You can combine multiple producers into one:
 *   Use `rpl::combine` or `rpl::merge` to combine streams.
 *   When starting a chain (`std::move(producer) | rpl::map(...)`), explicitly move the initial producer.
 *   These functions typically duplicate their input producers internally.
-*   Starting a pipeline consumes the producer; use `
+*   Starting a pipeline consumes the producer; use `

.cursor/rules/styling.mdc

@@ -1,3 +1,8 @@
+---
+description: For tasks requiring working with user facing UI components.
+globs:
+alwaysApply: false
+---
 # Telegram Desktop UI Styling
 
 ## Style Definition Files
@@ -146,4 +151,4 @@ void MyWidget::paintEvent(QPaintEvent *e) {
 *   Icons are defined inline using `name: icon{{ "path_stem", color }};` or `name: icon{ { "path1", c1 }, ... };` syntax, with optional path modifiers.
 *   Code generation creates `struct` definitions in the `style` namespace for custom types and objects/structs in the `st` namespace for defined variables/groups.
 *   Generated headers are in `styles/` with a `style_` prefix and must be included.
-*   Access style properties via the generated `st::` objects (e.g., `st::primaryButton.height`, `st::chatInput.backgroundColor`).
+*   Access style properties via the generated `st::` objects (e.g., `st::primaryButton.height`, `st::chatInput.backgroundColor`).