feat(Watermark): add protected logic

[ArgoZhang]

add protected logic

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 #5134

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

Add logic to protect watermarks from being removed.

New Features:

• Added a feature to protect watermarks from being removed.

Tests:

• Added unit tests to verify the watermark protection logic.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request implements protected logic for the Watermark component to prevent unauthorized removal or modification. It does this by periodically monitoring the watermark element and restoring it if any changes are detected.

Sequence diagram for Watermark protection monitoring

sequenceDiagram
    participant W as Watermark Component
    participant M as Monitor Function
    participant RAF as RequestAnimationFrame

    W->>M: Start monitoring
    activate M
    M->>M: Check watermark integrity
    alt Watermark modified
        M->>W: Clear watermark
        W->>W: Recreate watermark
    else Watermark intact
        M->>RAF: Schedule next check
        RAF-->>M: Next frame
    end
    deactivate M

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State diagram for Watermark protection checks

stateDiagram-v2
    [*] --> Monitoring
    Monitoring --> CheckingProperties: Monitor tick
    CheckingProperties --> Compromised: Invalid properties detected
    CheckingProperties --> Monitoring: All properties valid
    Compromised --> Monitoring: Watermark restored

    state CheckingProperties {
        [*] --> CheckDisplay
        CheckDisplay --> CheckOpacity
        CheckOpacity --> CheckPosition
        CheckPosition --> CheckInset
        CheckInset --> CheckZIndex
        CheckZIndex --> CheckBackgroundProps
        CheckBackgroundProps --> [*]
    }

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File-Level Changes

Change	Details	Files
Added logic to monitor and restore the watermark if it is modified or removed by external scripts or user interactions.	Added a monitor function that checks the watermark's styles and attributes. Added a clearWatermark function to remove the watermark and disconnect the observer. Added logic to recreate the watermark if any of its properties are modified. Modified the createWatermark function to call the monitor function after creating the watermark. Stored the watermark options and observer in the watermark object for later use in the monitor and clearWatermark functions. Fixed a floating-point precision issue in the background size calculation by using toFixed(3).	src/BootstrapBlazor/Components/Watermark/Watermark.razor.js

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#5134	Add protected logic to the Watermark component	✅

Possibly linked issues

• feat(Watermark): add protected logic #5134: The PR fixes the TypeError bug by adding protected logic to the Watermark component. The PR directly references the issue.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (cf6aaab) to head (7b98a16).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #5135   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          634       634           
  Lines        28181     28181           
  Branches      4040      4040           
=========================================
  Hits         28181     28181           

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