Make application dependencies optional during setup

[daedaevibin]

Description

Currently, the setup requires certain applications (like Firefox, VSCode OSS, etc.) to be installed. I don’t use some of these, and the setup fails because of it. All items like these should be optional and not hard requirements.

Steps to Reproduce

1. Clone the repository.
2. Run the setup/update script without having Firefox, VSCode OSS, or Zen Browser installed.
3. Observe that the process fails.

Expected Behavior

Setup/update should complete successfully, skipping optional apps that aren’t installed.

Actual Behavior

Setup/update fails with permission or directory errors related to applications not installed.

extra notes before log:
Wayclick does not stay enabled and disables with every single update, reload, or modification.

Log Output

~ ❯ cat /home/dae/Documents/logs/dusky_update_20260309_152122_OfizCx.log                                                    
================================================================================
 DUSKY UPDATE LOG — 20260309_152122
 Kernel: 6.19.6-1-cachyos-eevdf-lto | User: dae | Bash: 5.3.9(1)-release
================================================================================
[15:21:23] [INFO   ] Acquiring sudo privileges for execution sequence...
[15:21:23] [SECTION] Synchronizing Dotfiles Repository
[15:21:24] [WARN   ] Remote mismatch detected: ssh://git@github.com/dusklinux/dusky
[15:21:24] [INFO   ] Updating origin to: https://github.com/dusklinux/dusky
[15:21:24] [INFO   ] Fetching from upstream...
[15:21:24] [OK     ] Fetch complete.
[15:21:24] [INFO   ] Checking sync status...
[15:21:24] [INFO   ] Upstream changes:
[15:21:24] [WARN   ] Local history diverged from upstream.
[15:21:35] [OK     ] Full tracked-tree backup preserved at: /home/dae/Documents/dusky_backups/pre_reset_20260309_152122_Crss6v (1060 file(s))
[15:21:35] [INFO   ] Resetting to upstream...
fatal: cannot create directory at '.vscode-oss/extensions': Permission denied
[15:21:35] [ERROR  ] Reset failed.
[15:21:35] [WARN   ] Sync failed.
[15:21:35] [INFO   ] Full tracked tree backup preserved at:
[15:21:35] [SECTION] Summary
[15:21:35] [WARN   ] Sync phase did not complete successfully.
[15:21:35] [INFO   ] Log saved to: /home/dae/Documents/logs/dusky_update_20260309_152122_OfizCx.log

[daedaevibin]

I've been unable to update or even attempt clean setup without full reset for weeks.