Show warning when using tinydb database

[pylipp]

• Show warning if not using sqlite database type
• More info about config filepath
• Update changelog

[coveralls]

coverage: 100.0%. remained the same
when pulling 38f3a5f on tinydb-warning
into cc069ee on master.

[Copilot]

Pull request overview

This PR adds a deprecation warning to encourage users to migrate from TinyDB to SQLite database backend before the default changes in v2.0. The warning is displayed whenever a user runs a command (except migrate-pockets) with a non-sqlite database type configured.

Changes:

• Add warning message when using non-sqlite database types, informing users about the upcoming v2.0 default change
• Add filepath property to Configuration class to provide access to the config file path
• Mock warning calls in existing test cases to prevent test failures
• Add comprehensive test for the warning message content
• Update plugin test to explicitly set database_type to sqlite
• Update changelog to document the warning feature

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
financeager/cli.py	Adds database type check and warning message after migrate-pockets early return
financeager/config.py	Adds filepath property and CONFIG_FILEPATH import for use in warning message
test/test_cli.py	Mocks warning logger in test classes and adds test_tinydb_warning test case; updates plugin test config
Changelog.md	Updates entry for #271 to mention the warning feature and adds PR #276 reference

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