Hide unavailable view actions and improve filter cancellation

[jthuangarm]

Fixes

Stacked PR on top of PR#926.
Blocked until PR#926 is merged, and will be rebased to main afterwards.

Changes

• Hide toolbar and Command Palette actions when they are not usable:

  • No active debug session: hide inactive view actions.
  • AUX GDB unavailable: hide Enable/Disable Periodic Update.

• Filtering behavior is more predictable:

  • Deleting the text to fix a mistake no longer closes the filter box by itself.
  • Enter confirms the current text.
  • Escape cancels the edit and restores the previous filter.
  • Workspace settings should be synced as well.

Checklist

• 🤖 This change is covered by unit tests (if applicable).
• 🤹 Manual testing has been performed (if necessary).
• 🛡️ Security impacts have been considered (if relevant).
• 📖 Documentation updates are complete (if required).
• 🧠 Third-party dependencies and TPIP updated (if required).

[qltysh]

All good ✅

[jreineckearm]

Thanks, changes look good and work as expected! Nice work