[codex] complete controlled widget state behavior

[ola-893]

Summary

Completes several controlled widget state behaviors and removes serialization panic paths in example widget actions.

• Adds controlled DatePicker month navigation fields and docs
• Wires NumberInput text changes through number payload parsing
• Adds indeterminate CircularProgress rotation support
• Adds Drawer enter/fade transitions and modal/drawer focus barriers
• Replaces example action serialization unwraps with recoverable fallbacks

Why

These widgets exposed controlled state fields but had incomplete behavior for common interactions. Some example action payload creation also used infallible serialization assumptions.

Impact

Applications can now drive DatePicker navigation explicitly, NumberInput text edits can update numeric state, and modal surfaces trap focus more consistently.

Validation

• cargo check -p fission-widgets --lib --locked --offline
• cargo test -p fission-core --test input_controller_tests test_number_input_type_filters_ime_commit --locked --offline --quiet -- --nocapture
• cargo check -p inbox --locked --offline
• cargo check -p fission-editor --locked --offline