[Feature Request] Show current path in window title and running command in tab title

[iamkartiknayak]

Issue/Description:
COSMIC Terminal currently shows a current path as window title as long as the current selected tab isn't running a process. TLDR; it uses the same title as the current selected tab (redundant data).

Suggestion:
The window title should always reflect the current working directory of the active tab, and each tab title should display the command currently running (when applicable).

Steps to Reproduce:

• Open COSMIC Terminal
• Navigate to different directories in multiple tabs
• Run a long-running command (e.g., cargo build --release)
• Observe the window title when switching tabs

Expected Behavior:

• The window title bar always shows the full (or abbreviated) path of the active tab
• The tab title shows the currently running command while it is executing
• Once the command finishes, the tab title reflects the completed command & returns to a meaningful default (e.g., shell or path)

Other Notes:

• I would like to see the current path as window title & tab title would reflect the process it's running
• It would be more helpful if the tab title can show a percentage of the executing command it it can be inferred similar to how ptyxis has implemented with a circular progress indicator.

Related to #453