revert: AI inline assistant for SQL editor (PR F)

[datlechin]

Summary

Reverts the inline SQL assistant from #1084 — too much surface area for an experimental feature. ~750 LOC of new code: InlineAssistantSession, InlineAssistantPresenter, InlineAssistantOverlayController, InlineAssistantPromptView, AIEditorContextMenu, prompt templates, plus borderless NSPanel + NSEvent localKeyDown monitor wiring through SQLEditorCoordinator.

The chat panel + per-connection rules + per-mode tool gating (PRs A, B, C, D, G) cover the core AI assistance path. Inline rewrite-in-place adds a second editor surface, a second streaming pipeline, and a custom panel chrome — return on complexity is not yet proven.

What this PR does

1. Reverts fix: inline assistant + tool registry compile errors #1085 (inline assistant compile-error hotfix) — that fix only mattered for feat: AI inline assistant for SQL editor #1084 code.
2. Reverts feat: AI inline assistant for SQL editor #1084 (PR F merge) — drops all InlineAssistant* files, the editor coordinator hooks, the AIEditorContextMenu wiring, and the Edit > Rewrite with AI… menu.
3. Re-applies the nonisolated modifier on ChatToolRegistry.isToolAllowed(name:in:) — that part of fix: inline assistant + tool registry compile errors #1085 was for PR D's tool gating (still in main) and is unrelated to inline assistant. Without it, AIChatViewModel.runToolUse (nonisolated static) cannot call isToolAllowed.

What stays in main

• PR A layout shell
• PR B composer rewrite (TextField axis vertical + Apple Intelligence shimmer)
• PR C code blocks via CodeEditSourceEditor
• PR D mode-gated tools (Ask / Edit / Agent)
• PR G per-connection AI rules
• PR fix: anchor mention popover at composer top-leading #1086 mention popover anchor fix

Test plan

• Build the project. No InlineAssistant* references remain.
• SQL editor: select text, press Ctrl+Return. Nothing happens (no panel) — the keybind is no longer captured.
• Editor context menu has no Rewrite with AI... item.
• AI Chat panel still works end-to-end: typing, mention popover, code blocks, mode switching, per-connection rules.
• xcodebuild test -only-testing:TableProTests/ChatToolRegistryModeTests still passes (verifies isToolAllowed reachable from nonisolated context).

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