refactor(plasma-hope): slim TextField to types-only exports (T6)

[Yeti-or]

PLASMA-HOPE

TextField

• removed TextField implementation and views/ (~1,000 LOC)
• kept types.ts + minimal index.ts (TextFieldView, TextFieldProps) for web/b2c compat layer

What/why changed

Part of the plasma-hope → plasma-new-hope migration (#2870).

Stream T — Trim plasma-hope, step T6. plasma-web and plasma-b2c only import hope TextFieldView and legacy prop types; the component implementation already lives in new-hope.

Stream T PRs: #2861 (T1), #2862 (T2), #2863 (T3), #2864 (T4), #2865 (T5), #2866 (T6), #2867 (T7), #2868 (T8). Merge strictly in order T1→T8 into dev; rebase the next PR onto dev after each merge.

Issue: #2870

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