fix: fix flash black on login

[calsys456]

This will work as intended.

Summary by Sourcery

Bug Fixes:

• Fix an incorrect hardcoded username string in the XDG session validation logic to ensure proper handling for the intended user.

[deepin-ci-robot]

Hi @calsys456. Thanks for your PR.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adjusts the session activation guard to validate against the correct system user name when no valid XDG session ID is present.

File-Level Changes

Change	Details	Files
Correct the hard-coded username used to validate session activation when xdgSessionId is non-positive.	Update the username string literal in the activateSession guard from the old value to the corrected system username Keep the validation logic structure and logging behavior unchanged while relying on the new username	src/daemon/Display.cpp

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[sourcery-ai]

Hey - I've found 1 issue, and left some high level feedback:

• Consider replacing the hard-coded username string ("dde") with a named constant or configuration value so that any future username changes are easier to manage and less error-prone.
• It may be worth double-checking that all related code paths using the special ddm/dde user are updated consistently so this behavioral change does not introduce inconsistencies elsewhere.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider replacing the hard-coded username string ("dde") with a named constant or configuration value so that any future username changes are easier to manage and less error-prone.
- It may be worth double-checking that all related code paths using the special ddm/dde user are updated consistently so this behavioral change does not introduce inconsistencies elsewhere.

## Individual Comments

### Comment 1
<location> `src/daemon/Display.cpp:133` </location>
<code_context>

     void Display::activateSession(const QString &user, int xdgSessionId) {
-        if (xdgSessionId <= 0 && user != QStringLiteral("ddm")) {
+        if (xdgSessionId <= 0 && user != QStringLiteral("dde")) {
             qCritical() << "Invalid xdg session id" << xdgSessionId << "for user" << user;
             return;
</code_context>

<issue_to_address>
**suggestion:** Consider centralizing the special user name instead of hardcoding the string literal here.

This condition now relies on the literal "dde". If this is a well-known system user, define it once (e.g., as a constant or config value) and reference it here to avoid future mismatches and make the special handling explicit.

Suggested implementation:

```cpp
    }

    namespace {
    const QString kDisplayManagerUser = QStringLiteral("dde");
    }

    void Display::activateSession(const QString &user, int xdgSessionId) {
        if (xdgSessionId <= 0 && user != kDisplayManagerUser) {
            qCritical() << "Invalid xdg session id" << xdgSessionId << "for user" << user;
            return;
        }

```

If there are other occurrences of the literal `"dde"` (or the previous `"ddm"`) in this file representing the same special system user, they should also be replaced with `kDisplayManagerUser` for consistency.
</issue_to_address>

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: calsys456, zccrs

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