fix(Modal): use TrySetResult prevent throw exception

[ArgoZhang]

use TrySetResult prevent throw exception

Summary of the changes (Less than 80 chars)

简单描述你更改了什么, 不超过80个字符；如果有关联 Issue 请在下方填写相关编号

Description

fixes #5221

Regression?

• Yes
• No

[If yes, specify the version the behavior has regressed from]

[是否影响老版本]

Risk

• High
• Medium
• Low

[Justify the selection above]

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

Summary by Sourcery

Bug Fixes:

• Fixed an exception being thrown when closing a modal.

[sourcery-ai]

Reviewer's Guide by Sourcery

The pull request modifies the ModalDialog component to use TrySetResult instead of SetResult when closing the modal. This change prevents exceptions from being thrown if the task has already been completed.

Sequence diagram for Modal Dialog closing process

sequenceDiagram
    participant C as Client
    participant MD as ModalDialog
    participant MT as Modal Task

C->>MD: Close Modal
activate MD
MD->>MT: TrySetResult(result)
Note right of MT: Safely sets result without throwing
MD->>MD: Modal.Close()
MD-->>C: Modal Closed
deactivate MD

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State diagram for Modal Dialog Result Task

stateDiagram-v2
    [*] --> Pending
    Pending --> Completed: TrySetResult
    Completed --> [*]
    note right of Completed: Using TrySetResult prevents
    note right of Completed: exceptions if already completed

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File-Level Changes

Change	Details	Files
Use TrySetResult instead of SetResult to prevent exceptions.	Replaced ResultTask?.SetResult(_result) with ResultTask?.TrySetResult(_result).	src/BootstrapBlazor/Components/Modal/ModalDialog.razor.cs

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[sourcery-ai]

Hey @ArgoZhang - I've reviewed your changes - here's some feedback:

Overall Comments:

• Please fill out the PR template completely, including the Risk level and Regression status. This helps reviewers better understand the impact of the change.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (0d04f6f) to head (33d1d74).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #5222   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          635       635           
  Lines        28243     28243           
  Branches      4066      4066           
=========================================
  Hits         28243     28243           

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