Add unit tests for model and notifier packages

[Copilot]

Increases test coverage for previously untested model conversion functions and notifier utilities.

New Test Coverage

• DeviceAlertTest — Tests all format methods (toText, toExtendedText, toHtml, toJson) with battery/storage alert variants
• DeviceAlertJsonPayloadTest — Tests JSON serialization with optional fields handling
• AlertCheckLogTest — Tests toAlertCheckLog() extension functions for both AlertCheckLogEntity and AlertLogWithConfig
• NotifierTypeTest — Tests enum display names
• NotificationSenderExtTest — Tests of() extension function including error cases

Coverage Impact

Class	Before	After
AlertCheckLogKt	0%	100%
NotificationSenderKt.of()	0%	100%
DeviceAlert format methods	partial	comprehensive

Original prompt

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This section details on the original issue you should resolve

<issue_title>Increase test coverage</issue_title>
<issue_description>Increase test coverage in key areas of the app.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Increase test coverage #360

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[github-actions]

Code Coverage Report

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[github-actions]

📊 APK Size Analysis

Comparing main → copilot/increase-test-coverage (this PR)

OLD: base.apk (signature: none)
NEW: app-release-unsigned.apk (signature: none)

          │          compressed          │         uncompressed         
          ├───────────┬───────────┬──────┼───────────┬───────────┬──────
 APK      │ old       │ new       │ diff │ old       │ new       │ diff 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
      dex │   6.2 MiB │   6.2 MiB │  0 B │   6.2 MiB │   6.2 MiB │  0 B 
     arsc │ 429.7 KiB │ 429.7 KiB │  0 B │ 429.6 KiB │ 429.6 KiB │  0 B 
 manifest │   3.6 KiB │   3.6 KiB │  0 B │  16.4 KiB │  16.4 KiB │  0 B 
      res │   160 KiB │   160 KiB │  0 B │   197 KiB │   197 KiB │  0 B 
   native │  60.1 KiB │  60.1 KiB │  0 B │  58.9 KiB │  58.9 KiB │  0 B 
    asset │   6.7 KiB │   6.7 KiB │  0 B │   6.4 KiB │   6.4 KiB │  0 B 
    other │   106 KiB │   106 KiB │ +1 B │ 172.2 KiB │ 172.2 KiB │  0 B 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
    total │   6.9 MiB │   6.9 MiB │ +1 B │     7 MiB │     7 MiB │  0 B 

 DEX     │ old   │ new   │ diff      
─────────┼───────┼───────┼───────────
   files │     1 │     1 │ 0         
 strings │ 32846 │ 32846 │ 0 (+2 -2) 
   types │  8722 │  8722 │ 0 (+0 -0) 
 classes │  7437 │  7437 │ 0 (+0 -0) 
 methods │ 39793 │ 39793 │ 0 (+0 -0) 
  fields │ 23771 │ 23771 │ 0 (+0 -0) 

 ARSC    │ old │ new │ diff 
─────────┼─────┼─────┼──────
 configs │ 109 │ 109 │  0   
 entries │ 391 │ 391 │  0

APK

  compressed  │ uncompressed │                                           
───────┬──────┼───────┬──────┤                                           
 size  │ diff │ size  │ diff │ path                                      
───────┼──────┼───────┼──────┼───────────────────────────────────────────
 272 B │ +1 B │ 120 B │  0 B │ ∆ META-INF/version-control-info.textproto 
───────┼──────┼───────┼──────┼───────────────────────────────────────────
 272 B │ +1 B │ 120 B │  0 B │ (total)

DEX

STRINGS:

   old   │ new   │ diff      
  ───────┼───────┼───────────
   32846 │ 32846 │ 0 (+2 -2) 
  
  + e276d65
  + v1.16 (e276d65)
  
  - 5fc0fc6
  - v1.16 (5fc0fc6)

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