feat: add Memory record TUI

[notgitika]

This PR adds TUI implementation to the memory record list and get commands implemented in PR #1895

PR #1906 adds the event TUI. Stacks on top of the both of them.

The flow:
Adds Memory selection followed by namespace scope entry. Supports namespace and namespace-path.

It lists records with content, strategy, and creation timeand opens up selected event as an entire JSON. Pagination, filtering, retries, empty states, and back navigation is implemented.

I tested this myself + using the TUI harness skill.

Typcheck, lint, build and test passes

[codecov-commenter]

Codecov Report

❌ Patch coverage is 97.32143% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.16%. Comparing base (8e64c48) to head (f4785fa).

Files with missing lines	Patch %	Lines
src/handlers/memory/record/list/screen.tsx	96.77%	5 Missing ⚠️
src/handlers/memory/record/screen.tsx	50.00%	1 Missing ⚠️

Additional details and impacted files

@@                    Coverage Diff                    @@
##           feat/memory-event-tui    #1908      +/-   ##
=========================================================
+ Coverage                  96.14%   96.16%   +0.02%     
=========================================================
  Files                        235      238       +3     
  Lines                      11821    12042     +221     
=========================================================
+ Hits                       11365    11580     +215     
- Misses                       456      462       +6     

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