v0.3.0

Feature release adding color themes and an About box, plus a large batch of TUI fixes and internal cleanup.

New Features

The TUI now ships with selectable color themes: auto, dark, light, dracula, solarized, and mono.

Press t in the TUI to cycle themes; the choice is saved to your config
Set ui.theme in config.yaml to pin a theme (auto picks dark or light from the terminal background)

Press a in the TUI for an About box with version, author, license, and links for reporting bugs and feature requests
agcm --help now shows author, license, and homepage in its footer

Two documented config keys that previously had no effect now work:

api.timeout - HTTP client timeout (default: 30s)
ui.page_size - default list cases limit when --limit is not given (default: 25)

Ctrl+U/Ctrl+D now page the case list as advertised in the help screen
Mouse clicks inside the filter dialog now land on the right field: hit-testing and the product dropdown follow the dialog's actual on-screen position instead of assuming the top-left corner
Panes no longer render two columns wider than the terminal
The STATUS column shrinks gracefully on narrow terminals
Wide characters (CJK, emoji) truncate correctly everywhere in the TUI; previously some columns counted bytes or runes instead of display width
Refreshing while paginated case pages are in flight no longer duplicates or misplaces rows; stale pages are dropped and re-requested
Styled text and OSC-8 hyperlinks survive dialog overlays intact
The status bar hints and help screen are rendered from the key map, so they can't drift from the actual bindings
agcm show no longer fetches case comments twice

Removed the export_case MCP tool. It returned exactly the same markdown as get_case; use get_case instead.
Bundle export (B in the TUI, export cases --bundle) is now shared code with test coverage; CLI progress output is slightly simplified

Removed roughly 1,300 lines of dead and duplicated code across the API client, auth, config, export, and TUI packages
New tests for bundle export, list paging keys, filter dialog positioning, and pinned-size frame rendering