feat(session): add database preparation boundary PR 1

[MohamadJaara]

Goal

Add the Android boundary for Kalium's explicit user-session database preparation lifecycle.

Changes

• update the Kalium pointer to the preparation API implementation
• add a single Android preparation gate and explicit success/failure mapping
• cover shared preparation, scope reuse, and retryability with focused tests

Impact

This is a foundation-only change. It introduces no screen or consumer behavior yet; later PRs use this boundary before accessing a user database.

Stack

• Epic branch: mo/epic/async-db-migration
• PR 1 of 7

[github-actions]

Test Results

2 274 tests  +3   2 274 ✅ +3   2m 44s ⏱️ +58s
  251 suites +1       0 💤 ±0 
  251 files   +1       0 ❌ ±0 

Results for commit 8bacfda. ± Comparison against base commit 221865e.

♻️ This comment has been updated with latest results.

[github-actions]

@MohamadJaara looks like you are rolling back kalium to a previous commitish.

This means that the PR's target branch (develop) is using a newer version of Kalium, and the changes in this PR will rollback Kalium to an older version.

develop	This PR
b6b73047c2589b0dd51d86524f07a42e5edeafd0	4106bc6ace0f69781c5212ce7f6d712fae4c0d5a

Is this intentional?

[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 52.24%. Comparing base (221865e) to head (8bacfda).

Files with missing lines	Patch %	Lines
...wire/android/session/UserSessionPreparationGate.kt	92.85%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5158      +/-   ##
===========================================
+ Coverage    52.21%   52.24%   +0.02%     
===========================================
  Files          668      669       +1     
  Lines        23987    24001      +14     
  Branches      3952     3955       +3     
===========================================
+ Hits         12526    12539      +13     
- Misses       10301    10302       +1     
  Partials      1160     1160              

Files with missing lines	Coverage Δ
...wire/android/session/UserSessionPreparationGate.kt	92.85% <92.85%> (ø)

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[github-actions]

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