show pasted files/images as removable chips in the composer (T-142)

Pasting a file or image now adds a chip above the input instead of
inserting the raw @path as editable text: an image thumbnail
(Image.file of the cache/temp file, with an icon fallback) or a file
icon plus the basename, each with a × to cancel it before sending. On
submit the chips' @path tokens are appended to the typed text and the
chips clear.

resolveClipboardAttachment now returns ComposerAttachment descriptors
(path + isImage) rather than a pre-joined token string, so the composer
can render and manage each one. No new package dependency.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.pql/changelog/ticket_history/2026-05.sql

@@ -2143,3 +2143,4 @@ INSERT INTO ticket_history (ticket_id, field, old_value, new_value, changed_by,
 INSERT INTO ticket_history (ticket_id, field, old_value, new_value, changed_by, changed_at, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('T-137', 'status', 'in_progress', 'done', NULL, '2026-05-22 18:14:32', '2026-05-22 18:14:32', '2026-05-22 18:14:32', NULL, 'a284c7249dda3c63a52a202bad07f105', 1) ON CONFLICT(hash) DO NOTHING;
 INSERT INTO ticket_history (ticket_id, field, old_value, new_value, changed_by, changed_at, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('T-138', 'status', 'backlog', 'in_progress', NULL, '2026-05-22 21:08:05', '2026-05-22 21:08:05', '2026-05-22 21:08:05', NULL, 'c3dfefe24d912081cd89ac0be066b641', 1) ON CONFLICT(hash) DO NOTHING;
 INSERT INTO ticket_history (ticket_id, field, old_value, new_value, changed_by, changed_at, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('T-138', 'status', 'in_progress', 'done', NULL, '2026-05-22 21:49:09', '2026-05-22 21:49:09', '2026-05-22 21:49:09', NULL, 'e4be02e339d638da70a4e7ce0f850691', 1) ON CONFLICT(hash) DO NOTHING;
+INSERT INTO ticket_history (ticket_id, field, old_value, new_value, changed_by, changed_at, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('T-142', 'status', 'backlog', 'in_progress', NULL, '2026-05-22 22:09:09', '2026-05-22 22:09:09', '2026-05-22 22:09:09', NULL, 'b799657bf436bc44e306ef71658c80e5', 1) ON CONFLICT(hash) DO NOTHING;

.pql/changelog/tickets/2026-05.sql

@@ -2488,3 +2488,4 @@ INSERT INTO tickets (id, type, parent_id, title, description, status, priority,
 INSERT INTO tickets (id, type, parent_id, title, description, status, priority, assigned_to, team, decision_ref, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('T-137', 'story', 'T-132', 'ConversationView + replace the terminal in the Claude pane', 'New lib/builtin/claude/src/conversation_view.dart rendering user / assistant(markdown via ClideMarkdown) / tool-call card / tool-result+diff card; whole tree under one SelectionArea. Swap ClidePtyView -> ConversationView in lib/builtin/claude/src/claude_pane.dart (~line 287). Claude still runs in tmux (detached / output ignored) but content comes from the transcript (TranscriptReader). Keep the terminal builtin + ClidePtyView for general use. Surface conversation as events too (D-6). Cite D-75. Acceptance: make run shows the native Claude conversation from the live transcript; select+copy across cards works; no terminal in the Claude pane; terminal builtin still works; widget tests. Blocked by T3, T4.', 'done', 'high', NULL, NULL, NULL, '2026-05-22 15:59:34', '2026-05-22 18:14:32', NULL, '6651a2c3c9099f7d38553f6cf9e41e98', 1) ON CONFLICT(id) DO UPDATE SET type=excluded.type, parent_id=excluded.parent_id, title=excluded.title, description=excluded.description, status=excluded.status, priority=excluded.priority, assigned_to=excluded.assigned_to, team=excluded.team, decision_ref=excluded.decision_ref, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at > tickets.updated_at OR (excluded.updated_at = tickets.updated_at AND excluded.hash > tickets.hash);
 INSERT INTO tickets (id, type, parent_id, title, description, status, priority, assigned_to, team, decision_ref, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('T-138', 'task', 'T-132', 'Native composer + file/image paste', 'New lib/builtin/claude/src/claude_composer.dart: native text field -> tmux -L clide send-keys -t <pane> (Enter submit, Shift+Enter newline). Paste text inline; file/image per the T2 spike finding (likely temp-file + path/@-reference, since send-keys carries text only). Acceptance: typing in the composer reaches Claude; pasting a text file and an image both work via the validated mechanism. Blocked by T2, T5.', 'in_progress', 'medium', NULL, NULL, NULL, '2026-05-22 15:59:34', '2026-05-22 21:08:05', NULL, '2e6b932ad78ac78d83c86c5e08290ed3', 1) ON CONFLICT(id) DO UPDATE SET type=excluded.type, parent_id=excluded.parent_id, title=excluded.title, description=excluded.description, status=excluded.status, priority=excluded.priority, assigned_to=excluded.assigned_to, team=excluded.team, decision_ref=excluded.decision_ref, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at > tickets.updated_at OR (excluded.updated_at = tickets.updated_at AND excluded.hash > tickets.hash);
 INSERT INTO tickets (id, type, parent_id, title, description, status, priority, assigned_to, team, decision_ref, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('T-138', 'task', 'T-132', 'Native composer + file/image paste', 'New lib/builtin/claude/src/claude_composer.dart: native text field -> tmux -L clide send-keys -t <pane> (Enter submit, Shift+Enter newline). Paste text inline; file/image per the T2 spike finding (likely temp-file + path/@-reference, since send-keys carries text only). Acceptance: typing in the composer reaches Claude; pasting a text file and an image both work via the validated mechanism. Blocked by T2, T5.', 'done', 'medium', NULL, NULL, NULL, '2026-05-22 15:59:34', '2026-05-22 21:49:09', NULL, '8b247ce6f9fc63c6f56030303aece2e8', 1) ON CONFLICT(id) DO UPDATE SET type=excluded.type, parent_id=excluded.parent_id, title=excluded.title, description=excluded.description, status=excluded.status, priority=excluded.priority, assigned_to=excluded.assigned_to, team=excluded.team, decision_ref=excluded.decision_ref, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at > tickets.updated_at OR (excluded.updated_at = tickets.updated_at AND excluded.hash > tickets.hash);
+INSERT INTO tickets (id, type, parent_id, title, description, status, priority, assigned_to, team, decision_ref, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('T-142', 'task', 'T-132', 'Composer attachment chips (thumbnail/icon on paste)', 'Show pasted files/images as chips above the composer input instead of inserting the @path as text. Image chips render a thumbnail (Image.file of the cache/temp file); other types show a Phosphor file icon + basename; each chip has a remove ×. On submit, the typed text plus the chips'' @path tokens are assembled into the message sent via tmux.sendMessage, then text + chips clear. Typed @path text still works. resolveClipboardAttachment changes to return a list of attachment descriptors (path + isImage). No new package deps (Image.file + existing Phosphor icons). Builds on T-138.', 'in_progress', 'medium', NULL, NULL, NULL, '2026-05-22 22:06:59', '2026-05-22 22:09:09', NULL, 'da746aa3a523e3b351eaa13f19fa51e1', 1) ON CONFLICT(id) DO UPDATE SET type=excluded.type, parent_id=excluded.parent_id, title=excluded.title, description=excluded.description, status=excluded.status, priority=excluded.priority, assigned_to=excluded.assigned_to, team=excluded.team, decision_ref=excluded.decision_ref, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at > tickets.updated_at OR (excluded.updated_at = tickets.updated_at AND excluded.hash > tickets.hash);