add mouse selection#15
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Use libghostty selection APIs to implement mouse-driven text selection in Ghostling. Single-click drag now installs terminal-owned selection ranges, double-click selects and extends by word, and triple-click selects a line. Selection state keeps a tracked grid reference for the drag anchor so it remains valid across terminal mutations. Mouse tracking continues to be forwarded to applications by default, while Shift overrides capture for terminal selection. Selected cells are rendered from render-state selection metadata, and the cursor changes to an I-beam over selectable grid cells. This doesn't add copy yet.
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Use libghostty selection APIs to implement mouse-driven text selection in Ghostling. Single-click drag now installs terminal-owned selection ranges, double-click selects and extends by word, and triple-click selects a line.
Selection state keeps a tracked grid reference for the drag anchor so it remains valid across terminal mutations. Mouse tracking continues to be forwarded to applications by default, while Shift overrides capture for terminal selection. Selected cells are rendered from render-state selection metadata, and the cursor changes to an I-beam over selectable grid cells.
This doesn't add copy yet.