feat(orthography): full ainconv option set + four tu styles

[mkpoli]

Addresses part of the config feedback: "the options are limited… see ainconv-tests for more orthographical options such as wi we etc… check tu mode, we have many options (twu トゥ / tu ツ゚ / to ト゚ / barely ツ)… allow customization."

Brings the katakana notation options up to the canonical set in ainconv-tests/options.schema.json, plus a richer tu:

option	effect
tu_style	to ト゚ · tsu ツ゚ · twu トゥ · plain_tsu ツ
use_small_i / use_small_u	-y/-w coda → small ィ / ゥ (was the single small_glides)
use_small_n	-n coda → ㇴ instead of ン
use_wi / use_we / use_wo	keep ヰ / ヱ / ヲ instead of ウィ / ウェ / ウォ

• Applied in kana::convert_with over ainconv's default output; w-kana are post-processed so a following coda survives (wen → ウェン → ヱン).
• 8 new/updated unit tests (via the host harness); clippy -D warnings clean on the Windows target.
• Settings dialog keeps the basic glides/tu checkboxes compiling; the full per-coda + w-kana set is config-file-driven (the GUI rework + a richer control is a separate PR).

⚠️ The small_glides key is renamed (→ use_small_i/use_small_u); since config.toml auto-regenerates, a hand-set value resets to default — fine for the early beta.

Follow-ups from the same feedback (separate PRs): self-documenting config.toml (inline comments + valid-value lists), and the Start-Menu shortcut + ShowSettings rundll32 export so the GUI is reachable on Windows 11 (where the language bar — and thus the langbar Settings menu — is hidden by default).

Summary by CodeRabbit

• New Features

  • Added finer orthography controls for small i/u, small n, and wi/we/wo rendering.
  • Expanded tu rendering styles with additional tu options.

• Bug Fixes

  • Improved conversion/remapping behavior to follow the new per-option orthography settings (including wi/we/wo, small n, and tu variants).

• Tests

  • Updated conversion and TOML round-trip tests to use the new schema fields and defaults.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: 309dc27b-6fae-49e5-a829-4a1e7fef095a

📥 Commits

Reviewing files that changed from the base of the PR and between e35e1f2 and dc32778.

📒 Files selected for processing (3)

• src/config.rs
• src/kana.rs
• src/settings_dialog.rs

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📝 Walkthrough

Walkthrough

TuStyle and Orthography gain new rendering options, convert_with uses the expanded flags and post-processing rules, and the settings dialog maps its glides checkbox to the new config fields.

Changes

Orthography rendering flow

Layer / File(s)	Summary
Config schema and defaults src/config.rs	TuStyle adds Twu and PlainTsu; Orthography replaces small_glides with explicit booleans; defaults and TOML tests use the new fields.
Kana conversion and remapping src/kana.rs	convert_with uses the new orthography flags for coda glides and post-processes wi/we/wo, small n, and tu_style output; kana tests cover the updated cases.
Glides checkbox binding src/settings_dialog.rs	The glides checkbox reads from use_small_i/use_small_u and writes both fields back into the config.

Sequence Diagram(s)

sequenceDiagram
  participant SettingsDialog
  participant Orthography
  participant convert_with
  participant ainconv
  SettingsDialog->>Orthography: set use_small_i and use_small_u from ID_GLIDES
  Orthography->>convert_with: provide rendering flags
  convert_with->>ainconv: convert input text
  convert_with->>convert_with: post-process wi/we/wo, small n, and tu_style output

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Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

Possibly related PRs

• mkpoli/ainuKey#19: Extends the same orthography configuration and TuStyle surface that this PR builds on.

Poem

I hopped through kana in the winter light,
with tiny n's and glides tucked neat and right.
Four tu forms twinkled in my bun-bun view,
and wi/we/wo danced home anew.
🐇✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: expanded orthography options and four tu styles.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/orthography-options

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@src/settings_dialog.rs`:
- Line 61: The orthography checkbox logic in settings_dialog::SettingsDialog is
collapsing two config-only fields into one UI state and then writing both back
on save, which overwrites preserved per-coda choices. Update the save/load
handling around the checkbox representation so SettingsDialog only copies back
the orthography fields the UI can actually express, and leave config-file-only
state unchanged when use_small_i and use_small_u differ. Use the existing
orthography mapping and the OK/save path near the current UI checkbox binding
and the config writeback logic to locate the fix.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d196e5a7-695c-4ceb-9fb9-485b227385d3

📥 Commits

Reviewing files that changed from the base of the PR and between 0338210 and e35e1f2.

📒 Files selected for processing (3)

• src/config.rs
• src/kana.rs
• src/settings_dialog.rs