Align Android message status wording

[RCGV1]

Summary

• Align Android message routing error labels with [ALIGNMENT]: Message Status design#43 and [Alignment]: Standardize message status wording and presentation #6115.
• Add coverage for all surfaced routing error labels and keep retryable failures in warning color while non-retryable oversized messages stay error-colored.
• Update in-app docs wording so help content matches the standardized labels.

UI validation

Local status-state screenshots were generated and reviewed. Evidence images are embedded below from an evidence-only branch; screenshot files are intentionally not committed to this PR branch.

Validation

• ./gradlew :screenshot-tests:updateDebugScreenshotTest --no-daemon passed for local UI validation.
• ./gradlew spotlessApply --no-daemon passed.
• ./gradlew detekt --no-daemon passed.
• ./gradlew test --no-daemon passed.

Hardware verification

Not yet performed. This PR is draft until Android hardware verification is complete.

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[roberthadow]

Hello @RCGV1 --

This is excellent. I have already volunteered to help documentation for the Android UI as soon as the details are sorted.

[jamesarich]

A few things before this comes out of draft:

1. Scope / translations. Most of the 44 files are the 36 hand-edited docs/<locale>/user/messages-and-channels.md files. Those are Crowdin-managed outputs (crowdin.yml maps translations to docs/{code}/user/), so these edits will be overwritten on the next sync — and right now they inject English into localized docs (e.g. docs/ar-rSA/user/messages-and-channels.md:80 shows "Failed to deliver to mesh" in the Arabic table). Please revert all non-English docs and keep only docs/en/user/messages-and-channels.md; Crowdin handles the rest. That drops this to ~6 files.

2. screenshot-check is red. The new preview states in MessageItemPreviews.kt don't have committed golden PNGs. Please run the screenshot-update task and commit them.

3. Undocumented behavior change. Message.kt:166 removes NO_CHANNEL from nonRetryableMessageRoutingErrors, which makes channel/key-mismatch failures retryable and warning-colored (MessageItem.kt:399). That's a real behavior change, not just wording — please call it out in the description and confirm it's intended.

The core wording/logic change looks clean (no values-*/strings.xml edits, index regenerated, tests added).

[jamesarich]

Requesting changes — three items to resolve before this leaves draft (detail in the comment above):

1. Revert the 36 Crowdin-managed locale docs. crowdin.yml owns docs/{code}/user/; hand-editing them corrupts localized content (English injected into non-English tables, e.g. docs/ar-rSA/user/messages-and-channels.md:80) and gets clobbered on the next sync. Keep only docs/en/user/messages-and-channels.md. This drops the PR from 44 files to ~6.
2. Commit the screenshot goldens for the new MessageItemPreviews.kt states — screenshot-check is red without them.
3. Document the NO_CHANNEL behavior change (Message.kt:166 makes channel/key-mismatch failures retryable + warning-colored) in the description, and confirm it's intended — it's a behavior change, not just wording.

The core logic/wording change itself looks clean.