Release 0.4.15 Preparation

Summary

Prepares version 0.4.15 with updated pubspec.yaml, CHANGELOG.md, and PKGBUILD.

Highlights in 0.4.15

• Multi-Tab SQL Workspace (feat(editor): multi-tab query sessions in SQL workspace #679, PR feat(editor): multi-tab query sessions in SQL workspace (close #679) #684) — Multiple independent query sessions per connection with tab strip (SqlQueryTabBar), separate editor state, split panel sizing, query history, result grids, and DML staging buffers with IndexedStack state preservation and tab shortcuts (Ctrl+T, Ctrl+W, Ctrl+Tab, Ctrl+Shift+Tab).
• Adaptive Content-Aware Column Sizing & Auto-Fit (feat(workspace): adaptive content-aware column sizing and header double-click auto-fit in DataGrid #676, PR feat(workspace): adaptive content-aware column sizing and header double-click auto-fit (close #676) #681) — Dynamic header-based minimum column widths (56px) without inflating compact columns (id, status), weighted distribution of excess viewport width in favor of long text fields (name, description), and double-click (onDoubleTap) on column header dividers for instantaneous content-aware auto-fit.
• Data Grid Cell Context Menu & Non-Destructive Actions (feat(workspace): data grid cell context menu and non-destructive right-click actions #678, PR feat(workspace): data grid cell context menu and non-destructive right-click actions (close #678) #683) — Native right-click context menu with TSV/JSON/CSV copy formats (Copy Value, Copy with Headers, Copy as JSON/CSV), instant filter bridge (Filter by this value, Filter out this value), value inspector access (Ctrl+I), setting explicit NULL (Alt+N), and reverting cell changes.
• Desktop File Associations & Open-With Handlers (feat(platform): desktop file associations and open-with support for SQL and SQLite files #694, PR feat(desktop): file associations, open-with handler and universal syntax highlighting #695) — Native file associations and Open-With support for SQL scripts (.sql) and SQLite databases (.db, .sqlite, .sqlite3) on Linux (.desktop, %F), macOS (Info.plist), and Windows (Inno Setup / Registry) via FileLaunchService.
• Master-Detail Categorized Preferences Dialog (feat(settings): master-detail categorized preferences dialog with sidebar and search #686, refactor(settings): unify toggles with PreferencesSwitchRow and polish input alignments #687, feat(settings): interactive keyboard shortcuts reference section in preferences #688, feat(settings): extract theme editor into focused modal and clean up appearance actions #689, PR feat(settings): master-detail categorized preferences dialog with sidebar and search (close #686) #690, refactor(settings): unify toggles with PreferencesSwitchRow and polish input alignments (close #687) #691, feat(settings): interactive keyboard shortcuts reference section in preferences #692, feat(settings): extract theme editor into focused modal and clean up appearance actions #693) — Modern two-pane Master-Detail preferences layout with sidebar categories (General, Appearance, SQL & Editor, Data Grid, Extensions, Keymap, About & Storage), global search (Ctrl+F), deep-linking, unified PreferencesSwitchRow toggles, update channel selector (Stable / Beta), interactive Keyboard Shortcuts (Keymap) reference matrix, and a dedicated visual Theme Editor modal window.
• Connection Tree Quick Search, Filtering & Pinning (feat(connections): quick search and filter in database object tree #680, PR feat(connections): quick search and filter in database object tree (close #680) #685) — Global quick search in sidebar connections tree (Ctrl+F / Cmd+F) with auto-expanding matching folders, compact inline TreeObjectFilterBar for filtering tables/views/procedures in large schemas, and table/view pinning (⭐) with automatic top-of-list sorting.
• Interactive Server-Side Column Sorting (fix(workspace): resolve data grid sorting index corruption and implement table view sorting #696, PR fix(workspace): resolve data grid sorting index corruption and implement table view sorting #697) — Tri-state interactive server-side sorting (ASC -> DESC -> Natural) in SQLite, PostgreSQL, and MySQL table views with model row index mapping preservation in VirtualResultGrid.
• UI/UX Polishing for Data Grid, Filter Bar & Staging (polish(workspace): UI/UX refinements for data grid, filter bar, staging toolbar, and export labels #700, PR polish(workspace): UI/UX refinements for data grid, filter bar, staging toolbar, and export labels #701) — Semantic theme color tokens for filter suggestions (cs.popover, cs.popoverForeground, cs.border), disambiguated Export ▾ menu vs Save Changes button, keyboard shortcut tooltips (Ctrl+Insert, Ctrl+Delete, Ctrl+Z, Ctrl+S), and quick filter bar close button / Escape dismiss handling.
• Elimination of UI Freezes & Isolate Performance Optimizations (perf(workspace): resolve UI freezes, unmemoized allocations, and isolate blocking in grid and inspector #702, PR perf(workspace): resolve UI freezes, unmemoized allocations, and isolate blocking in grid and inspector #703) — Adaptive background isolate offloading for large table sorting (sortResultGridRowsWithIndicesAdaptive, $N \ge 3000$) with version tokenization, zero-allocation clean reads and caching in DataGridStagingBuffer.effectiveRows, caching of groupings tree in DataGridGroupingsView outside of build(), and 150ms debounced JSON/XML validation in DataGridValuePanel.
• Latent Bug Fixes & Stability (fix(ui): resolve workspace pane width overflow, sqlite dialog layout break, and responsive view issues #677, fix(core): resolve latent bugs in grid filtering, MySQL escaping, export formatters, and staging buffer disposal #698, PR fix(ui): resolve workspace pane width overflow, sqlite dialog layout break, and responsive view issues (close #677) #682, fix(core): resolve latent bugs in grid filtering, MySQL escaping, export formatters, and staging buffer disposal #699) — Resolved layout overflows and bottom padding breaks across SQLite forms and database overview screens, fixed MySQL/MariaDB backslash escaping in DML generator, prevented memory leaks on Staging Buffer disposal and debounce timers, validated unclosed string literals in SQL filter AST parser, and sanitized pipe characters and quotes in Markdown and SQL INSERT export formats.

Quality

• 0 analyzer warnings (flutter analyze).
• 1328 / 1328 non-golden tests passing.