fix(agda): preserve input method in evil normal mode

[kovan]

Summary

• Advise read-from-minibuffer and read-string to restore the input method from evil-input-method when in evil normal state
• No-op when no input method is configured (checks evil-input-method first)
• Guarded by (modulep! :editor evil)

Context

Fixes #5711. Evil clears current-input-method in normal state by design, storing the real method in evil-input-method. When agda2-mode calls read-string with INHERIT-INPUT-METHOD=t (e.g. for typecheck prompts), it inherits nil instead of the agda input method. Users must switch to insert mode first as a workaround.

Based on the workaround posted by @fdeitylink in the issue thread.

Test plan

• Enable agda module with evil mode
• Open an agda file, load it with agda2-load
• In normal mode, invoke a command that opens a minibuffer prompt (e.g. refine, give)
• Verify agda's quail input method translations work in the prompt
• Verify normal buffers without input methods are unaffected

---

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