* feat: add Wizard component for multi-step wizard flows

Add a new Wizard component that supports:
- Multi-step wizard with breadcrumb navigation
- Navigation enum (Next, Back, Jump, Stay, Done)
- Section struct with label and run closure
- Breadcrumb rendering with numbered sections [1:Name] > 2:Tools
- Escape key handling for back navigation
- Proper Ctrl+C cleanup

Also adds breadcrumb styling fields to Theme:
- breadcrumb_active, breadcrumb_clickable, breadcrumb_future
- breadcrumb_separator

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix(wizard): address PR review feedback

- Add cursor restoration on successful wizard completion (Navigation::Done)
- Mark target section as visited when navigating Back or on Escape
- Add documentation for handle_navigation_key explaining it's a utility
  for library consumers implementing custom widgets

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix: clear widget output before returning Interrupted error

When Escape is pressed, widgets now clear their rendered output before
returning the Interrupted error. This prevents stale widget output from
accumulating when navigating between sections in wizard flows.

Affected widgets: Select, MultiSelect, Input, Confirm

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* chore: address PR review feedback

- Fix render_breadcrumb doc comment to accurately describe limitations
- Remove Section and SectionFn from public exports (users interact via
  Wizard::section() builder method)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

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* optimize rendering for multiselect dialogue

* fix test

* fix problems listed in pr review

* fix: add #[non_exhaustive] to Theme struct

Prevents future breaking changes when adding new theme fields,
since users must use `..Default::default()` instead of struct literals.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: update Theme doc example for #[non_exhaustive] compatibility

Struct literal syntax doesn't work for #[non_exhaustive] structs from
external crates. Use field assignment on a default instance instead.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: add #[non_exhaustive] to CursorShape enum

Prevents breaking changes when adding new cursor shape variants
(e.g., Beam) since external code must include a wildcard match arm.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

* feat(input): add mask_on_submit option

Add a new `mask_on_submit` flag that shows input in cleartext while
typing but masks it with asterisks after submission. Useful for PINs
where the user needs to see what they're typing but the value should
not remain visible in terminal scrollback.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: restore fixed-length mask for password mode in render_success

Password mode now shows 12 asterisks (original behavior) to avoid
revealing password length. mask_on_submit uses actual input length
without .max(1) so empty input correctly shows nothing.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: use chars().count() instead of len() for mask_on_submit

Byte length produces too many asterisks for multi-byte UTF-8 input.
Use character count to match the rest of the codebase.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* test: add render_success tests for mask_on_submit and password modes

Also document that password takes precedence over mask_on_submit.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>