fix: Linux .run installer with proper install script, desktop entry, and bundled icon

[kilo-code-bot]

Summary

Fixes the Linux .run self-extracting installer to produce a complete, polished installation experience instead of just extracting and running in-place.

Changes

New files

• scripts/water-install.sh — Install script executed by the .run installer that:

  • Copies the Water binary to ~/.local/bin/Water.bin
  • Generates an installed launcher script at ~/.local/bin/Water (with Mesa fallback)
  • Copies Mesa fallback libraries to ~/.local/lib/water/
  • Copies the app icon to ~/.local/share/icons/water.png
  • Installs the .desktop file to ~/.local/share/applications/water.desktop
  • Makes the binary executable
  • Prints a success message with usage instructions

• scripts/water.desktop — XDG desktop entry template with @BIN_DIR@ and @ICON_DIR@ placeholders that are substituted at install time with the actual paths

Modified files

• Makefile — Updated _bundle-linux-mesa target to:
  • Bundle the .desktop file and install script in the .run payload
  • Use install.sh as the makeself startup script (instead of the launcher)
  • The icon (logo-only.png) continues to be bundled as icon.png in the payload

.run payload structure

Water-linux-amd64/
├── bin/Water          # actual binary
├── lib/               # Mesa fallback libraries
│   ├── dri/
│   ├── libGL.so.1
│   └── ...
├── icon.png           # app icon (bundled from resources/logo-only.png)
├── water.desktop      # desktop entry template
└── install.sh         # install script (makeself startup)

Install locations

Asset	Path
Binary	~/.local/bin/Water.bin
Launcher	~/.local/bin/Water
Mesa libs	~/.local/lib/water/
Icon	~/.local/share/icons/water.png
Desktop entry	~/.local/share/applications/water.desktop

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