Summer changes preview (PG + RA + #30, combined, do not merge)#32

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Edwinexd wants to merge 13 commits into

preview/summer-changes

Commits on Jun 16, 2026

Add relational algebra mode with RA-to-SQL transpiler
Edwinexd
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Add RA editor UI: highlighter, reference dialog, mode switching
Edwinexd
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Add natural join and CTE validation with database reflection
Edwinexd
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Add mode-aware progress tracking, RA preview box, and RA PNG export
Edwinexd
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Fix SQL generation and add comprehensive execution tests
Edwinexd
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Fix editor highlighter, preview rendering, dark mode, and export readability
Edwinexd
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Add license attribution dialog with full dependency listing
Edwinexd
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Add dual SQLite/PostgreSQL engine support with CodeMirror editor and autocomplete
Edwinexd
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Add engine to save format (v4) and engine-aware import/export
Edwinexd
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Fix PGlite duplicate-column and numeric parity, safe engine fallback
Edwinexd
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Preview: combine PG, RA projection-distinct, neither-persons, master
Edwinexd
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Add changelog entries for summer changes
Edwinexd
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Restore generated data and i18n strings lost in linearization
Edwinexd
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