refactor: unify CandidateProto object for paged and bulk candidates

[WhiredPlanck]

Pull request

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Additional Info

[Copilot]

Pull request overview

This PR refactors the candidate pipeline (JNI ↔ Kotlin UI) to use a single CandidateProto model for both paged (PagingSource) and bulk candidate retrieval, removing the older CandidateItem model and updating conversions/adapters accordingly.

Changes:

• Replaced CandidateItem/CandidateList with CandidateProto across JNI helpers, native APIs, and Kotlin adapters.
• Updated JNI object conversion to always construct CandidateProto(text, comment, label) with non-null comment.
• Migrated UI adapters and message payloads to operate on CandidateProto arrays.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
app/src/main/jni/librime_jni/rime_jni.cc	Switch native candidate retrieval to return std::vector<CandidateProto> for paged and bulk paths.
app/src/main/jni/librime_jni/objconv.h	Remove CandidateItem conversions; convert CandidateProto lists to CandidateProto[] for JNI.
app/src/main/jni/librime_jni/jni-utils.h	Remove CandidateItem global refs; update CandidateProto constructor signature binding.
app/src/main/jni/librime_jni/helper-types.h	Remove CandidateList alias; make CandidateProto.comment non-optional and add a RimeCandidate ctor.
app/src/main/java/com/osfans/trime/ime/candidates/unrolled/PagingCandidateViewAdapter.kt	Update paging adapter to use CandidateProto.
app/src/main/java/com/osfans/trime/ime/candidates/unrolled/CandidatesPagingSource.kt	Update paging source generics to CandidateProto.
app/src/main/java/com/osfans/trime/ime/candidates/popup/LabeledCandidateItemUi.kt	Adjust comment rendering to non-null comment.
app/src/main/java/com/osfans/trime/ime/candidates/compact/CompactCandidateViewAdapter.kt	Update compact adapter to use CandidateProto.
app/src/main/java/com/osfans/trime/ime/candidates/CandidateItemUi.kt	Update candidate row UI binding to accept CandidateProto.
app/src/main/java/com/osfans/trime/core/SchemaItem.kt	Remove the CandidateItem data class from core models.
app/src/main/java/com/osfans/trime/core/RimeProto.kt	Make CandidateProto.comment non-nullable (String).
app/src/main/java/com/osfans/trime/core/RimeMessage.kt	Update CandidateListMessage payload to Array<CandidateProto>.
app/src/main/java/com/osfans/trime/core/RimeApi.kt	Update getCandidates() API to return Array<CandidateProto>.
app/src/main/java/com/osfans/trime/core/Rime.kt	Update native method typings and getCandidates() implementation to CandidateProto.

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