fix(a11y): associate waitlist email label and fallback channel avatar alt text

[yacosta738]

Rescues the two deterministic accessibility fixes from #970 into a minimal reviewable change.

Changes:

• apps/web/marketing/src/components/WaitlistForm.astro: visible email text uses label[for=waitlist-email] instead of a span
• apps/web/marketing/src/components/WaitlistForm.test.ts: regression coverage for the label association
• apps/web/app/src/modules/publishing/presentation/components/ComposerChannelSelector.vue: generic Channel avatar alt text when the channel name is missing
• apps/web/app/src/modules/publishing/presentation/components/ComposerChannelSelector.test.ts: regression coverage for both alt variants

Verification:

• New tests watched failing first, then green after the fix (TDD)
• Marketing suite: 15 files / 139 tests pass
• App publishing module: 32 files / 817 tests pass
• Pre-push hooks green: backend-detekt, backend-spotless, backend-test, shared-detekt, gitleaks

Related #970 (superset PR to be closed once this is green).

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📥 Commits

Reviewing files that changed from the base of the PR and between 5aef681 and 5ce8781.

📒 Files selected for processing (4)

• apps/web/app/src/modules/publishing/presentation/components/ComposerChannelSelector.test.ts
• apps/web/app/src/modules/publishing/presentation/components/ComposerChannelSelector.vue
• apps/web/marketing/src/components/WaitlistForm.astro
• apps/web/marketing/src/components/WaitlistForm.test.ts

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Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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