feat: liquid glass ecosystem tuning, instant settings panel, and config guide

[Chintanpatel24]

Overview

This PR implements optical liquid-glass parity with KDE Dolphin under Lniri's kwin-glass compositor shader pipeline for both liquid-light and liquid-dark themes, optimizes the Settings dialog launch performance to open instantaneously, provides a comprehensive config.md reference guide, and migrates the Flatpak manifest and desktop integration to io.github.tattvaorg.Bubble.

Changes Summary

1. Flatpak Manifest & Desktop Integration Migration (io.github.tattvaorg.Bubble):

   • Renamed io.github.soyeb_jim285.Bubble.yml -> io.github.tattvaorg.Bubble.yml.
   • Updated app-id, Flathub license installation path, and Git source URL to https://github.com/TattvaOrg/Bubble.git.
   • Renamed and synchronized AppStream metainfo, desktop entry, and SVG icon under dist/ to io.github.tattvaorg.Bubble.*.
   • Updated CMake install rules to export the new desktop launcher, metainfo, and icon.
   • Updated default QGuiApplication::desktopFileName() in src/main.cpp for native Wayland compositor window matching.
   • Updated PKGBUILD, install.sh, uninstall.sh, scripts/release.sh, and scripts/build-appimage-local.sh.

2. Liquid Themes Calibration (liquid-light & liquid-dark):

   • sidebar_opacity = 0.0
   • toolbar_opacity = 0.0
   • content_opacity = 0.30
   • noise_enabled = false and noise_opacity = 0.0
   • Preserves high-refraction optical glass clarity without matte film or noise distortion.

3. QML Glass Layout Engine & Floating Rounded Cards:

   • In zero-opacity glass mode, content containers are rendered as elevated floating cards with 14px border radius and 1px subtle ambient rim border.
   • Dual-pane mode (F3 split view) renders twin floating cards side-by-side with independent focus highlights.
   • Inverse corner cutouts and separators are cleanly suppressed when sidebar/toolbar opacity is 0.0.
   • Classic opaque themes (Catppuccin, Nord, etc.) retain continuous flush layouts.

4. Instant Settings Panel Performance:

   • Added C++ caching for availableFonts(), availableIconThemes(), and availableThemes() in ConfigManager to eliminate repeated heavy fontconfig/filesystem scans on the main UI thread.
   • In SettingsPanel.qml:
     • Show, raise, and activate the dialog window immediately upon invocation.
     • Prevent redundant JS array allocations for fontOptions, iconThemeOptions, and themeOptions.
   • Gated Hyprland IPC calls in FileOperations with HYPRLAND_INSTANCE_SIGNATURE checks to prevent spawning unnecessary hyprctl processes on non-Hyprland compositors (Lniri/Niri, KDE, GNOME).

5. Documentation & Compositor Setup:

   • Added comprehensive config.md in repository root detailing all config.toml options, keybindings, custom context menus, and compositor rules for Lniri (kwin-glass), Hyprland, and KDE Plasma.
   • Updated README.md with verified kwin-glass Lniri window-rule configuration and io.github.tattvaorg.Bubble app-id matching.
   • Updated theme loader unit tests (tst_themeloader).

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