refactor(theme): route consumer reads through ClideSettings.theme (T-473)

Migrate ClideTheme.of(context) reads across the widget, feature, and shell
layers to the unified ClideSettings.theme.of(context) facade (D-101), so
theme/i18n/fonts/settings share one widget-facing entry. The facade delegates
straight to ClideTheme, so behaviour is unchanged — goldens are unmoved.

The low-level theme provider keeps its direct ClideTheme.of: the facade is
built on it, and the two kernel sites (ClideTheme's own definition + the
panels drag-resize widget) stay direct to avoid a widgets→kernel import cycle.
Dead controller.dart/kernel.dart imports left by the sweep removed.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.pql/changelog/ticket_history/2026-06.sql

@@ -5928,3 +5928,4 @@ INSERT INTO ticket_history (ticket_record_id, field, old_value, new_value, chang
 INSERT INTO ticket_history (ticket_record_id, field, old_value, new_value, changed_by, changed_at, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FDDX5KEAJ8KRWVV7ZSG6H7A0', 'description', NULL, 'Per D-101. Migrate i18n reads (ClideKernel.of(context).i18n[.string]) to ClideSettings.i18n.of(context). The facade delegates to the same I18n service, so behaviour is unchanged; mechanical sweep in batches.', NULL, '2026-06-17 19:03:22', '2026-06-17 19:03:22.235', '2026-06-17 19:03:22.235', NULL, '5d617ff30e22d3b4c57ca6325920d91a', 2) ON CONFLICT(hash) DO NOTHING;
 INSERT INTO ticket_history (ticket_record_id, field, old_value, new_value, changed_by, changed_at, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FDDTCGG5Z0KNQKF89W1VZSQ8', 'status', 'backlog', 'done', NULL, '2026-06-17 19:35:22', '2026-06-17 19:35:22.690', '2026-06-17 19:35:22.690', NULL, '580448456994d6acecc88cfbd40a595f', 2) ON CONFLICT(hash) DO NOTHING;
 INSERT INTO ticket_history (ticket_record_id, field, old_value, new_value, changed_by, changed_at, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FDDX5KEAJ8KRWVV7ZSG6H7A0', 'status', 'backlog', 'done', NULL, '2026-06-17 19:37:39', '2026-06-17 19:37:39.813', '2026-06-17 19:37:39.813', NULL, 'd59d0df2b693a0616265dd5e39559dc0', 2) ON CONFLICT(hash) DO NOTHING;
+INSERT INTO ticket_history (ticket_record_id, field, old_value, new_value, changed_by, changed_at, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FDDX5GVH3FTCVDEC1QAFACY4', 'status', 'backlog', 'done', NULL, '2026-06-17 19:47:02', '2026-06-17 19:47:02.941', '2026-06-17 19:47:02.941', NULL, '28625100d88cacac15cabe97754fcdc5', 2) ON CONFLICT(hash) DO NOTHING;

.pql/changelog/tickets/2026-06.sql

@@ -7247,3 +7247,4 @@ INSERT INTO tickets (record_id, type, parent_record_id, title, description, stat
 INSERT INTO tickets (record_id, type, parent_record_id, title, description, status, priority, assigned_to, team, decision_ref, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FDDX5KEAJ8KRWVV7ZSG6H7A0', 'task', '06FD07ECS3GK2V7Z2WYYPJHJYC', 'Migrate i18n consumers (ClideKernel.i18n → ClideSettings.i18n.of) per D-101', 'Per D-101. Migrate i18n reads (ClideKernel.of(context).i18n[.string]) to ClideSettings.i18n.of(context). The facade delegates to the same I18n service, so behaviour is unchanged; mechanical sweep in batches.', 'backlog', 'medium', NULL, NULL, NULL, '2026-06-17 19:00:21.490', '2026-06-17 19:03:22.235', NULL, '16d6229039400bd826a77a08eca9573b', 2) ON CONFLICT(record_id) DO UPDATE SET type=excluded.type, parent_record_id=excluded.parent_record_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 (record_id, type, parent_record_id, title, description, status, priority, assigned_to, team, decision_ref, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FDDTCGG5Z0KNQKF89W1VZSQ8', 'task', '06FD07ECS3GK2V7Z2WYYPJHJYC', 'Migrate 11 context-less mono-font sites onto ClideSettings.fonts (thread family through helpers)', 'Per D-101. The 11 sites that need a BuildContext threaded from the nearest context-bearing caller (resolve ClideSettings.fonts.monoOf(context) and pass the family in): prompt_card.dart toolEditBody/toolReadLikeBody/toolPathLine (top-level fns); conversation_view.dart _toolResult; welcome_view.dart _tipRow; search_panel_view.dart _base getter; clide_markdown.dart _inlineElementSpan/_recordLinkSpan/_fileLinkSpan (static span chain). Until done, these render the default JetBrains Mono regardless of the mono-font setting.', 'done', 'medium', NULL, NULL, NULL, '2026-06-17 18:48:11.649', '2026-06-17 19:35:22.690', NULL, '7dd6dae4197fc95d0bc6becfad4eecbb', 2) ON CONFLICT(record_id) DO UPDATE SET type=excluded.type, parent_record_id=excluded.parent_record_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 (record_id, type, parent_record_id, title, description, status, priority, assigned_to, team, decision_ref, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FDDX5KEAJ8KRWVV7ZSG6H7A0', 'task', '06FD07ECS3GK2V7Z2WYYPJHJYC', 'Migrate i18n consumers (ClideKernel.i18n → ClideSettings.i18n.of) per D-101', 'Per D-101. Migrate i18n reads (ClideKernel.of(context).i18n[.string]) to ClideSettings.i18n.of(context). The facade delegates to the same I18n service, so behaviour is unchanged; mechanical sweep in batches.', 'done', 'medium', NULL, NULL, NULL, '2026-06-17 19:00:21.490', '2026-06-17 19:37:39.813', NULL, 'fc64918991f0c9133419ee51227e1939', 2) ON CONFLICT(record_id) DO UPDATE SET type=excluded.type, parent_record_id=excluded.parent_record_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 (record_id, type, parent_record_id, title, description, status, priority, assigned_to, team, decision_ref, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FDDX5GVH3FTCVDEC1QAFACY4', 'task', '06FD07ECS3GK2V7Z2WYYPJHJYC', 'Migrate theme consumers (ClideTheme.of → ClideSettings.theme.of) per D-101', 'Per D-101. Migrate ClideTheme.of(context) consumers (hundreds of sites) to ClideSettings.theme.of(context). The facade already delegates to ClideTheme, so this is a mechanical, no-behavior-change sweep — do it in focused batches with analyze between, ideally via a scripted find/replace + import fixups.', 'done', 'medium', NULL, NULL, NULL, '2026-06-17 19:00:20.828', '2026-06-17 19:47:02.941', NULL, '8ea58b6162c81778a610f46b07585b05', 2) ON CONFLICT(record_id) DO UPDATE SET type=excluded.type, parent_record_id=excluded.parent_record_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);