feat(views): add PostgreSQL materialized views support

[Davydhh]

Part of #16

Adds PostgreSQL materialized views to the schema tree.

What you can do

• Browse materialized views in a dedicated Materialized Views group per schema
• Expand to see columns and indexes
• Show definition (read-only CREATE MATERIALIZED VIEW …)
• Refresh via REFRESH MATERIALIZED VIEW
• Open data / count rows like any other relation

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (14 files)

• src-tauri/src/commands.rs - 4 new Tauri commands for materialized views
• src-tauri/src/drivers/driver_trait.rs - Trait default impls + capability flag
• src-tauri/src/drivers/mysql/mod.rs - materialized_views: false capability
• src-tauri/src/drivers/postgres/mod.rs - Full PostgreSQL implementation
• src-tauri/src/drivers/sqlite/mod.rs - materialized_views: false capability
• src-tauri/src/lib.rs - Command registrations
• src/components/layout/ExplorerSidebar.tsx - Context menu for materialized views
• src/components/layout/sidebar/SidebarSchemaItem.tsx - Tree group rendering
• src/components/layout/sidebar/SidebarViewItem.tsx - Columns + indexes expansion
• src/contexts/DatabaseContext.ts - materializedViews field added to SchemaData
• src/contexts/DatabaseProvider.tsx - Loading materialized views in schema fetches
• src/i18n/locales/en.json - Localization strings
• src/types/plugins.ts - Frontend materialized_views capability
• tests/components/layout/sidebar/SidebarViewItem.test.tsx - Tests for materialized view path

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_{Reviewed by kimi-k2.6-20260420 · Input: 125.4K · Output: 21.6K · Cached: 1.6M}

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (14 files)

• src-tauri/src/commands.rs - 4 new Tauri commands for materialized views
• src-tauri/src/drivers/driver_trait.rs - Trait default impls + capability flag
• src-tauri/src/drivers/mysql/mod.rs - materialized_views: false capability
• src-tauri/src/drivers/postgres/mod.rs - Full PostgreSQL implementation
• src-tauri/src/drivers/sqlite/mod.rs - materialized_views: false capability
• src-tauri/src/lib.rs - Command registrations
• src/components/layout/ExplorerSidebar.tsx - Context menu for materialized views
• src/components/layout/sidebar/SidebarSchemaItem.tsx - Tree group rendering
• src/components/layout/sidebar/SidebarViewItem.tsx - Columns + indexes expansion
• src/contexts/DatabaseContext.ts - materializedViews field added to SchemaData
• src/contexts/DatabaseProvider.tsx - Loading materialized views in schema fetches
• src/i18n/locales/en.json - Localization strings
• src/types/plugins.ts - Frontend materialized_views capability
• tests/components/layout/sidebar/SidebarViewItem.test.tsx - Tests for materialized view path