chore: release v0.1.15

[WKJBryan]

Release v0.1.15

Changes since v0.1.14

Rust backend — deduplication refactor (PR #77)

• Extract run_retrieval() helper in commands/mod.rs to eliminate 4x duplicated lock-acquire pattern across retrieve_relevant, recall_relevant, and both canvas context resolvers
• Extract fetch_note_contexts() helper in commands/canvas.rs to deduplicate note content assembly
• Remove duplicate DiscoverMode enum from commands/zettelkasten.rs — now uses services::link_discovery::DiscoverMode directly
• Consolidate cosine_similarity into services/similarity.rs as sparse_cosine() free function

Frontend — component refactors (PRs #78–#80)

• BaseModal.vue: shared modal shell replacing 7 hand-rolled overlay implementations
• useAsyncOperation composable: eliminates repeated loading/error/try-catch/finally store boilerplate
• PanelHeader.vue + AsyncListState.vue: shared panel header and loading/empty tristate for 5 sidebar panels

Checklist

• npm run release:prepare -- 0.1.15 passed (versions bumped, Cargo.lock regenerated, 8 Cargo graphs validated)
• CI passes
• Merged to main
• npm run release:tag -- 0.1.15 + git push origin v0.1.15

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