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Refactor indentation logic to return and propagate character deltas so selections adjust correctly when indenting/outdenting. updateSelection now accepts totalDelta; adjustIndentation and related helpers return int deltas. Add smart Tab behavior: shift+Tab outdents, block indent for multi-line selections, and single-cursor smart indentation to next tab stop using new IndentOption.indentationAt(column:). Fix IndentOption.charCount returns and add indentationAt(column:) helper. Change jump-to-definition handling to use leftMouseDown for clicks and assign the TreeSitterClient to the jump model immediately to avoid nil. Replace deprecated resetCursorRects() with window?.invalidateCursorRects(for:) when updating additionalCursorRects. Add TextStory and TextFormation imports required by changes.

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Introduce diagnostics support: add Diagnostic/DiagnosticSeverity model, a DiagnosticsRenderer that draws squiggle underlines and hit-tests hovers, and a DiagnosticTooltipPanel (SwiftUI/NSPanel) to show messages with copy action. Integrate renderer into TextViewController (diagnostics property, renderer lifecycle, attach squiggle layer, mouseMoved handling and cleanup). Also remove a debug log line from TreeSitterClient.

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