fix(cli): show checksum progress in the live watch view

[aparajon]

Summary

Watching an apply during its checksum phase rendered a full progress bar and a numberless "Checksumming to verify data..." label, while schemabot status on the same apply showed the verify percent and a "Rows verified" line. The watch TUI parsed the progress response through its own private table struct, which dropped the checksum counters (plus the throttle fields and per-shard percent/cutover attempts) before they ever reached the shared renderer.

• The watch TUI now consumes templates.ParseProgressResponse output directly; the duplicate parse structs are deleted, so every progress view (status, progress, and the watch TUI) renders from the same parsed data.
• The logic that previously lived only in the watch TUI's private conversion moves into the shared parser, so the non-watch views gain it too: Spirit internal-table filtering, preferring Spirit's live progress string over the stored copy fields, deriving shard percent from rows, promoting the slowest shard's ETA to the table, and normalizing raw engine statuses.
• The watch view additionally regains the fields its old conversion dropped: checksum progress, the throttled indicator, shard percents, and cutover attempts.

before:  API response ──► watch-only structs (fields dropped) ──► shared renderer
after:   API response ──► templates.ParseProgressResponse ──► shared renderer
                          (single parse path for status / progress / watch)

Watch view during checksum (rendered)

⣾ Checksumming to verify data...

     ~ sessions: 🟦⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜ 🔍 Checksumming to verify data (8%)
       ALTER TABLE `sessions` ADD INDEX `idx_app`(`app_id`, `app_identifier`);
       • Rows verified: 73,075,845 / 832,771,089

ESC detach • s stop • v volume

Previously this rendered a full bar with "Checksumming to verify data..." and no rows line.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR unifies CLI/TUI progress rendering by routing the watch TUI through the shared templates.ParseProgressResponse parser, ensuring checksum/verify progress (and other previously-dropped fields) are consistently available across status, progress, and the live watch view.

Changes:

• Watch TUI now consumes templates.ParseProgressResponse output directly, removing duplicate progress structs/conversion logic.
• Shared progress parser now centralizes additional normalization/derivation (internal-table filtering, Spirit progress-string precedence, shard percent derivation, and slowest-shard ETA promotion).
• Adds/updates tests to cover checksum progress visibility in watch, shard percent derivation, ETA promotion, internal-table filtering, and status normalization.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pkg/cmd/internal/templates/progress_parse.go	Moves watch-only progress normalization into the shared parser and filters internal tables consistently.
pkg/cmd/internal/templates/progress_parse_test.go	Adds coverage for ETA promotion, shard percent derivation, internal-table filtering, and Spirit progress-string precedence.
pkg/cmd/commands/watch_tui.go	Replaces watch-private progress table types with shared template progress types.
pkg/cmd/commands/watch_tui_commands.go	Simplifies watch progress parsing by delegating to templates.ParseProgressResponse.
pkg/cmd/commands/watch_tui_view.go	Updates rendering helpers to operate on shared template progress types and removes conversion helpers.
pkg/cmd/commands/watch_tui_view_multi.go	Updates multi-deployment view helpers to use shared template progress types.
pkg/cmd/commands/watch_tui_test.go	Updates tests for shared types and adds coverage for checksum/verify progress in the watch view.
pkg/cmd/commands/watch_tui_vitess_test.go	Adjusts tests to validate watch parsing from API response shapes (typed apitypes structs).
pkg/cmd/commands/common.go	Updates change-count summarization helper to accept shared template progress types.
pkg/cmd/commands/common_test.go	Updates tests to use shared template progress types.

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