feat(sidebar): recent tables section (opt-in)

[J2TeamNNL]

Restores the Recent tables section dropped from TableProApp#1422 (commit 4b76452) for separate review, and adds a setting to toggle it.

Changes

• Restore Recent tables (RecentTablesStore in-memory, last 10 per connection+database, push-on-open, Recent section in the Tables tab, tests, docs, CHANGELOG Favorite tables and recent tables TableProApp/TablePro#1352). Recovered by reverting the removal commit.
• New setting General > Sidebar > Show recent tables, default OFF. When off the section is hidden and no opens are recorded. Added GeneralSettings.showRecentTables (backward-compatible decode), settings UI toggle, gating in SidebarView and MainContentCoordinator+Navigation, settings docs, and GeneralSettingsTests.

Base

Targets sidebar because the feature depends on the sidebar rework; merge after TableProApp#1422.

Review focus

1. Nghiep vu: scope per connection+database, cap 10, in-memory only, opt-in default off.
2. Trai nghiem: vi tri Recent section, hanh vi khi bat/tat setting.

Verification

Build/lint not run here (no Xcode in this env), needs CI. Restored code previously compiled on sidebar; verified TableRow / SidebarContextMenu / RecentTablesStore.Entry signatures still match. New test file is auto-included via the project's synchronized file groups.

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[J2TeamNNL]

Tạo nhầm base (sidebar). Mở lại đúng base main tại #3, đóng PR này.