japanese-verb-tower: fix README demo-verb list to match the code

[jbeshir]

The widget's README was out of sync with its code. The "10 demo verbs" table (and one teaching-note example) listed 見る, but the widget actually features 帰る — FEATURED_KANJI in src/morph.ts:185 ships ['飲む','話す','行く','買う','待つ','泳ぐ','食べる','帰る','する','来る'], and src/data/verbs.sample.json carries 帰る as かえる / kaeru / godan-r / to return.

Changes (README only):

• Replace the table row 見る | みる | miru | ichidan | see with 帰る | かえる | kaeru | godan | return.
• Add 帰る to the "Notable edge cases" line — it looks ichidan (ends in ‑える) but conjugates godan (帰らない／帰った), which is exactly why it's the more interesting demo verb.
• Drop 見る from the "Ichidan passive ≈ potential" example, leaving 食べる (the featured ichidan verb).

Surfaced while writing the design/frontend tutorials for this widget (#39, #40); both tutorials already follow the code, so this aligns the widget's own README with them.

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