feat(tui): show lock indicator for locked Milltime time entries

[alxhall]

This pull request introduces support for "locked" time entries by adding an attestation/lock level to entries, preventing editing or deletion of locked items, and updating the UI to visually indicate locked entries. The changes ensure that entries with an attestation level (week or month) cannot be modified, and provide clear feedback to users when such actions are attempted.

Entry Locking and Attestation Support

• Added a new AttestLevel enum to represent the attestation/lock status of a time entry, with methods for conversion and lock checking. The TimeEntry struct now includes an attest_level field, and entries default to unlocked unless specified.

Edit and Delete Guarding

• Updated edit and delete logic in App and runtime view handlers to check if the focused entry is locked before allowing modifications. If locked, a status message is shown and the action is blocked.
  User Feedback

• Added status messages for locked entry edit and delete attempts, providing immediate feedback to users when such actions are not permitted.

UI Updates

• Updated the display row logic to show a red "⊘" symbol for locked entries, taking precedence over the warning symbol for overlapping entries, to clearly indicate locked status in the UI.

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