docs: sync markdown and KDocs with current source code

[Copilot]

Several markdown docs and source-code KDocs had drifted from the actual codebase — stale library versions, missing Discord support, incorrect type signatures, and wrong Circuit/Metro patterns.

Library versions (copilot-instructions.md)

• Kotlin 2.2.0 → 2.3.20
• Room 2.7.1 → 2.8.4
• OkHttp 4.12.0 → 5.3.2
• WorkManager 2.10.1 → 2.11.2
• DataStore 1.1.6 → 1.2.1

Circuit / Metro pattern corrections (copilot-instructions.md + developer-portal README)

• Event type: sealed class Event : CircuitUiEvent → sealed interface Event : CircuitUiEvent
• Presenter injection: @Inject class SettingsPresenter → @AssistedInject class SettingsPresenter
• TestNotificationChannel parameter: notifierType → channelType

Developer Portal State types (developer-portal README)

Corrected the State data class to match actual types:

// Before (wrong)
val currentStorageGb: Double,
val maxStorageGb: Int,

// After (correct)
val currentStorageGb: Long,
val maxStorageGb: Long,

Missing Discord coverage

Added Discord to Key Features, Project Overview, and notification methods in copilot-instructions.md and app-description.md (added in v1.16, absent from all docs).

Release checklist (release-notes.md)

• build.gradle → app/build.gradle.kts
• Replaced outdated "Firebase Test Lab APK upload" steps with the current local-build-and-upload process

Source code KDocs

Added class-level and method-level KDocs to undocumented business-logic classes:

• BatteryMonitor — sticky broadcast approach, all 3 methods
• StorageMonitor — both measurement strategies, preferred path called out, all 4 methods
• AlertMediumConfigStore — interface contract + hasValidConfig() / validateConfig() methods
• AlertMediumConfig.TwilioConfig / EmailConfig — all fields documented
• AlertMediumConfig.WebhookConfig — clarified shared use by REST and Slack senders

Cleanup

• Fixed "each devices" → "each device" typo in app-description.md
• Removed phase3-implementation-plan.md (implementation completed, file was orphaned)

[github-actions]

Code Coverage Report

View Coverage Report

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 36.16%. Comparing base (a9ee8b2) to head (ed005d0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #443   +/-   ##
=======================================
  Coverage   36.16%   36.16%           
=======================================
  Files          86       86           
  Lines        2527     2527           
  Branches      215      215           
=======================================
  Hits          914      914           
  Misses       1574     1574           
  Partials       39       39           

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[github-actions]

📊 APK Size Analysis

Comparing main → copilot/update-markdown-and-source-code-docs (this PR)

OLD: base.apk (signature: V2)
NEW: app-release.apk (signature: V2)

          │          compressed          │         uncompressed         
          ├───────────┬───────────┬──────┼───────────┬───────────┬──────
 APK      │ old       │ new       │ diff │ old       │ new       │ diff 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
      dex │   6.7 MiB │   6.7 MiB │  0 B │   6.7 MiB │   6.7 MiB │  0 B 
     arsc │ 370.7 KiB │ 370.7 KiB │  0 B │ 370.6 KiB │ 370.6 KiB │  0 B 
 manifest │   3.7 KiB │   3.7 KiB │  0 B │  16.8 KiB │  16.8 KiB │  0 B 
      res │ 126.1 KiB │ 126.1 KiB │  0 B │ 168.3 KiB │ 168.3 KiB │  0 B 
   native │  64.3 KiB │  64.3 KiB │  0 B │    63 KiB │    63 KiB │  0 B 
    asset │  55.4 KiB │  55.4 KiB │  0 B │ 143.2 KiB │ 143.2 KiB │  0 B 
    other │  74.6 KiB │  74.6 KiB │ -1 B │ 154.9 KiB │ 154.9 KiB │  0 B 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
    total │   7.4 MiB │   7.4 MiB │ -1 B │   7.6 MiB │   7.6 MiB │  0 B 

 DEX     │ old   │ new   │ diff      
─────────┼───────┼───────┼───────────
   files │     1 │     1 │ 0         
 strings │ 34044 │ 34044 │ 0 (+4 -4) 
   types │  9115 │  9115 │ 0 (+0 -0) 
 classes │  7750 │  7750 │ 0 (+0 -0) 
 methods │ 43362 │ 43362 │ 0 (+0 -0) 
  fields │ 26011 │ 26011 │ 0 (+0 -0) 

 ARSC    │ old │ new │ diff 
─────────┼─────┼─────┼──────
 configs │ 105 │ 105 │  0   
 entries │ 273 │ 273 │  0

APK

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

DEX

STRINGS:

   old   │ new   │ diff      
  ───────┼───────┼───────────
   34044 │ 34044 │ 0 (+4 -4) 
  
  + ed005d0
  + r8-map-id-0570375ba03712f72556d1cc2a355b8f596b0ac82bdb2d466e68322a75aa1530
  + v1.20 (ed005d0)
  + ~~R8{"backend":"dex","compilation-mode":"release","has-checksums":false,"min-api":30,"pg-map-id":"0570375ba03712f72556d1cc2a355b8f596b0ac82bdb2d466e68322a75aa1530","r8-mode":"full","version":"9.1.31"}
  
  - a9ee8b2
  - r8-map-id-04158f7f96ee96da07a08a40152abbe568d59a8bea02e0bb2caffe289ac1ae59
  - v1.20 (a9ee8b2)
  - ~~R8{"backend":"dex","compilation-mode":"release","has-checksums":false,"min-api":30,"pg-map-id":"04158f7f96ee96da07a08a40152abbe568d59a8bea02e0bb2caffe289ac1ae59","r8-mode":"full","version":"9.1.31"}

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