[kavemang]

Closes #571.

What changed

• Follow a bare contentDescription = name reference to the nearest lexically visible val name = ... initializer.
• Bound initializer scanning across balanced expressions and explicit Kotlin line continuations without sweeping later statements or unrelated Compose lambdas.
• Add regression coverage for the reported CoupledScreen shape, parameters, sibling scopes, local shadowing, statement bounds, and multiline concatenation.
• Refresh the audit baseline with 24 newly visible accessibility literals across eight Android files, including the three reported in CoupledScreen.kt.

Why

#581 taught the Android audit to see literals assigned directly inside a semantics {} lambda, but it still saw no literal when a local variable carried the copy:

val a11y = when { ... }
Modifier.semantics { contentDescription = a11y }

This adds deliberately narrow lexical flow for that remaining #571 case. Pass-through parameters, arbitrary expressions, declarations in sibling scopes, and shadowed outer values are not followed.

Validation

• cd Tools && python3 -m unittest test_i18n_audit -v — 34/34 passed
• python3 Tools/i18n_audit.py --ci origin/main — passed; Android baseline 213, Apple baseline 64
• git diff --check — passed