Simplify DaVinci Resolve window rules

[sharms]

stay_focused = true on every Resolve window has needed a longer release allowlist in each of the last three changes (Project Manager → Preferences/Find Directory → Dialog), and any dialog not on it still blocks the screenshot layer's pointer input and fights sibling dialogs for focus (e.g. Create New Project vs. its own file picker). no_follow_mouse (#6919) already prevents the pointer warp stay_focused was covering for, so this drops it and the allowlist entirely.

Two small dialog fixes ride along, each as its own commit:

• Maximize the main window instead of fullscreening it. The bar still stays clear of Resolve's menu (the reason for fullscreen in fb564e3), but other windows on the workspace can be raised above Resolve again.
• Size and centre Resolve's dialogs. The bundled Qt file pickers open undersized on HiDPI, so open them at 55%×65% of the monitor, centred, and remember manual resizes with persistent_size since Qt never persists the geometry. The XWayland "Create New Project" dialog can land outside Hyprland's logical bounds on mixed-scale layouts, so centre it.

These rules have been running as ~/.config/hypr/hyprland.lua overrides on Omarchy 4.0.1 / Hyprland 0.56.2 with Resolve Studio 21.0.4 on a mixed 1.6×/2× two-monitor layout. luac -p and ./test/cli pass; the four ./test/shell failures (config, runtime-smoke, snapper, unowned-system-paths) reproduce identically on pristine quattro here and are environment-related.

Related: #5887.

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https://claude.ai/code/session_013sRgN2t4URuaqmdjPU9bpD