feat: Implement Search Query History (Up/Down Navigation) (#63)

[pisum-sativum]

This PR implements an internal query history feature for the trx TUI application. It saves users from having to re-type previous search queries by allowing them to navigate through prior searches using the Up and Down arrow keys when in search editing mode.

Features implemented:

• Loaded search history from ~/.local/state/trx/search_history on startup.
• Automatically persisted successful search queries (avoiding duplicates) to the local history file.
• Enabled standard shell readline-like behavior for Up and Down navigation in InputMode::Editing.
• Correctly saved and restored the in-progress input when navigating back past the most recent entry.
• Reset the history navigation state upon character insertion, deletion, Enter, or Esc.

Fixes #63

Type of Change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Manual test (Verified that navigating up/down cycles through previous searches correctly, that the history file is written to the expected path without duplicate entries, and that the active/in-progress query buffer is restored correctly when navigating down past the end of the history).

Checklist:

• My code follows the Coding Guidelines.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have NOT added useless AI-generated comments.
• I have NOT deleted existing unrelated comments.
• I have NOT modified files unrelated to this task.
• I have included screenshots/recordings (for UI changes).
• My changes generate no new warnings (clippy/fmt).
• I have linked the issue I am working on.

Screenshots (if applicable)

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