fix: always show save button on template pages

[GiulioSavini]

Summary

• The save button on /customize/templates/default and /customize/templates/[id] was hidden behind {#if composeValidationReady && envValidationReady}
• After the switch from Monaco to CodeMirror, the linter only runs on content changes — so validationReady stays false on initial page load and the button never appears
• Removed the {#if} guard; button is always visible and disabled via disabled={!canSave} which already enforces hasChanges, validationReady, and !hasErrors

Fixes #2387

Test plan

• Open /customize/templates/default — save button is visible but disabled until changes are made
• Open a custom template /customize/templates/[id] — same behaviour
• Make a change with a YAML error — button stays disabled
• Fix the error — button enables

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Greptile Summary

This PR fixes the save button being permanently invisible on template pages after the Monaco → CodeMirror migration, where the linter no longer runs on initial page load so validationReady stays false. The {#if} visibility guard is removed and the button is always rendered, relying on disabled={!canSave} which already encodes the same conditions (hasChanges, validationReady, no errors). The handleSave functions also retain their own defensive guards, so the save action remains safe.

Confidence Score: 5/5

Safe to merge — the fix is correct, minimal, and the save action remains properly guarded.

canSave already encodes all conditions that were in the removed {#if} guard, handleSave retains its own defensive checks, and the button stays inside the remote-template guard in [id]/+page.svelte. No logic regressions found.

No files require special attention.

_{Reviews (1): Last reviewed commit: "fix: always show save button on template..." | Re-trigger Greptile}

[kmendell]

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