test: add layout alignment tests and clean up blank lines

test: remove obsolete hint, char count, and button placement tests

feat: move translate button into input column

refactor: move hint and char count from textbox info to gr.HTML element

feat: enforce 2000 character limit on input

feat: move hint and char count into input textbox info

test: group UI tests by component

feat: add loading feedback on Translate button

feat: replace standalone Clear button with inline clear on input

feat: add character limit display and keyboard shortcut hint

feat: increase textbox height to 6 lines and remove input placeholder

feat: replace English label with static dropdown for visual symmetry

test: add tests for new UI components and update language format

test: add button wiring test and remove stale comments

test: add new layout tests for Google Translate-style UI

test: remove obsolete batch and sidebar tests

feat: redesign Batch tab with two-column layout matching Single tab

feat: add preview table to batch tab UI

feat: translate_batch returns table data alongside file path

test: add 24 tests and improve test infrastructure

feat: rebuild UI with sidebar and tabbed Single/Batch layout

feat: add translate_batch function for file-based translation

feat: add batch file parsing and output helpers

feat: add generation parameters to translate function

test: update langmap tests for Tier 1 language restriction

fix: remove MPS support and use float32 on CPU

test: add baseline test for main function

Update langmap tests for evaluated language set

Add test suite with fast and slow test markers